A. parenchyma tissue. B. sclerenchyma cells. Phelloderm is produced by Easy A Vascular cambium B Fascicular cambium C Phellogen D Intrafascicular cambium Solution Cork cambium or phellogen is a meristematic tissue that develops usually in the cortex region and is a couple of layers thick. You know what it looks like but what is it called? In some species, the phellogen produces phelloderm toward the inside of the stem and phellem toward the outside, but in many species only phellem is formed. The cork cambium, unlike the vascular cambium, does not grow in diameter. E. is produced by the cork cambium. Yes! Why? B. ground tissue. The cortex and the epidermis form at the time of primary growth. Your Mobile number and Email id will not be published. { "11.01:_Stem_Morphology_(External_Structure)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.
b__1]()", "11.02:_Internal_Anatomy_of_the_Primary_Stem" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.03:_Secondary_Stem" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.04:_Stem_Modifications" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.05:_Chapter_Summary" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "09:_Cells_and_Tissues" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "10:_Roots" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11:_Stems" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "12:_Leaves" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "showtoc:no", "license:ccbync", "source[1]-bio-18018", "source[2]-bio-18018", "program:oeri", "cid:biol155", "authorname:haetal", "licenseversion:40" ], https://bio.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FBookshelves%2FBotany%2FBotany_(Ha_Morrow_and_Algiers)%2FUnit_2%253A_Plant_Structure%2F11%253A_Stems%2F11.03%253A_Secondary_Stem, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Yuba College, College of the Redwoods, & Ventura College, : with large vessel elements in both early and late wood, 11.2: Internal Anatomy of the Primary Stem, Melissa Ha, Maria Morrow, & Kammy Algiers, ASCCC Open Educational Resources Initiative, Berkshire Community College Bioscience Image Library, Melissa Ha, Maria Morrow, and Kammy Algiers, status page at https://status.libretexts.org. What Is a Phelloderm? The cork cambium produces phelloderm, a storage tissue, to the inside of the root and cork, a protective layer of dead, suberized cells, toward the outside. B. cork cambium. D. tracheids E. ray cells. B. store food or water Difference between phellogen and phelloderm and phellum? A. Secondary growth or wood is noticeable in woody plants; it occurs in some eudicots, but occurs very rarely in monocots. C. sieve tubes. D. veins. ______________ consist(s) of elongated supporting cells with unevenly thickened cells walls, usually located in strands beneath the epidermis. B. secondary phloem B. pinnately compound. D. It is formed by the ground meristem. Arrange the following in the sequence you would find them in a plant starting from the periphery-phellem, phellogen, phelloderm. A. woody stems. In certain plants, some of the roots may be modified to carry out unusual functions. C. It is important in the elongation of roots. Which cells are characterized by thin cell walls, the largest vacuoles, and the least specialization? These are bands of parenchyma that are perpendicular to the concentric layers of xylem and phloem (Figure \(\PageIndex{2}\)). Periderm is the outer layer of certain plants. Phellogen divides by periclinal division and produced phellem or cork cells on the outside and phelloderm on the inner side. B. brussel sprouts C. lettuce C. It is the portion of the root that contains numerous root hairs. E. It seals the surface of roots that have been damaged. These three layers phelloderm, cork cambium, and cork are referred to as a periderm. Complete answer: The periderm is formed towards the surface of stems or roots. Webster's New World A tissue produced inwardly by the cork cambium. As a consequence, what other evolutionary adaptation was important for most land plants? E. They are responsible for primary and secondary growth. Now available Google Play Store- Doubts App. B. zone of maturation C. zone of elongation D. zone of cell division E. endodermis. The cortex hence expands as a result of the expansion of the diameter of the stem because of the activity of the vascular cambium. Click the card to flip Flashcards Created by jesusfdez29 Terms in this set (58) E 1. Distinguish between softwood and hardwood. Which type of stem does not produce a cork cambium? B. many chloroplasts. It allows for horizontal transport of water and nutrients. It is the main tissue that conduct waters in most plants. It protects the plant against physical damage and helps reduce water loss. American Heritage Similar definitions Advertisement Other Word Forms of Phelloderm Noun Singular: phelloderm Plural: phelloderms Origin of Phelloderm Trees growing in climates without well-expressed seasons, such as the tropical rainforest, will not make annual rings at all. D. "A rhizome, although a modified stem, acts as a root does. These transport large volumes of water, which is abundant due to spring rains. B. primary cells. (c) improper zoning. However, gas exchange with the environment is possible at lenticels, elevated regions of the periderm with many intercellular air spaces (Figure \(\PageIndex{5-6}\)). Palms may also have diffuse secondary growth which is division and enlargement of some parenchyma cells. E. have palmate venation. In the spring of temperate regions, the vascular cambium produces wide tracheary elements (the conducting cells of the xylem, either vessel elements or tracheids). Finally, softwoods contain resin ducts (Figure \(\PageIndex{11}\)), which contain a thick substance (resin) important in defense and response to injury. One moose, two moose. Difference # Phelloderm: 1. B. trichomes C. sclereids D. root hairs E. oil glands. E. primary cambium. Based on the Random House Unabridged Dictionary, Random House, Inc. 2023, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition It can be located in woody and several herbaceous dicots, some monocots, and gymnosperms. A. Root hairs are tubular extensions of individual epidermal cells. Phellogen is formed by the living parenchyma cells; meristem cells give rise to the periderm, phellem (cork) dead at maturity. The American Heritage Science Dictionary In the annual rings of woody trees, how does the xylem of the Spring and Summer wood compare to the fall and winter wood? D. collenchyma tissue. The cylinders are cork cambium and vascular cambium. D. secondary cambium. E. xylem tissue. When mature, they comprise dead cells. If the multiple periderms form perfect circles, the bark is smooth. B. protoderm. How could you distinguish between a root hair versus a very small root? C. the alternation of xylem and phloem produced in one year. The fusiform initials are the cells of the vascular cambium that divide to produce secondary xylem internally and secondary phloem externally. The phellem or the cork forms the exterior of the cork cambium. Phelloderm is parenchymatous. Produced by the phellogen towards the inner side. Phelloderm or secondary cortex is the thin-walled inner layer of cells produced by cork cambium or phellogen. What Is the Difference between Fabaceae, Solanaceae, and Liliaceae? Find similar words to phelloderm using the buttons C. are toothed at the edges. A. includes live companion cells and dead sieve cells. A. at the tip of a stem. It protects the surface of the root but allows water to be absorbed. 19. Trees and shrubs have active lateral It contains elongated conducting cells. It produces tough protective material called cork. D. parenchyma cells. What structural features are produced by cork cambium? The cortex is the primary tissue of stems and roots. E. companion cells. Published by Houghton Mifflin Harcourt Publishing Company. Phellogen: Phellogen is the cork cambium, a layer of meristematic tissue which produces the phellem and Phellogen together known as the periderm or bark. The phelloderm is present inside the cork cambium. D. Root hairs increase the absorption of water and minerals. Don't be surprised if none of them want the spotl One goose, two geese. Woody stems do not do regular gas exchange as primary stems do by opening and closing stomata, but woody plants still have leaves with high densities of stomata to regulate gas exchange. The ground tissue is arranged in concentric rings. All rights reserved. D It is an internal water-proofed layer that prevents water and minerals from moving through intercellular . At the end of the secondary stem's first year of growth, the periderm replaces the epidermis, but the cortex and pith are retained. Large vessel elements of other trees (like elm, Ulmus) occur more evenly in both early and late wood. 3. 7. B. Parenchyma Copyright HarperCollins Publishers Derived forms phellodermal (phellodermal) adjective Word origin C19: from Greek phellos cork + -derm Word Frequency phelloderm in American English D. vessel members. Greek phellos cork bhel-2 in Indo-European roots derm, From The first cork cambium in a stem emerges from the parenchyma cells in the outermost layers of the cortex. d. dissolves in water, 1. The periderm is composed of the phellogen, the phelloderm (produced by the phellogen inwards) and the phellem (cork) present outward of the phellogen [ 1] ( Figure 2 j,k). In an experiment, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several hours per day. American Heritage Dictionary of the English Language, Fifth Edition. E. axillary arrangement. Phellogen, phelloderm, and phellem are collectively known as periderm. 51. B. cork cambium. D. includes cortex and pith tissue. Which of the following is not true about meristems? E. covered with bark. A. plant While the vascular cambium is technically only a single layer cell layer, it looks similar to the layers of cells that surround it (that it recently divided to produce), and this entire region is sometimes called the vascular cambium as a result. A given phellogen cell usually produces a few cork cells every year. D. helps push away soil particles as the root grows E. releases a slimy lubricant fluid, 46. E. the proportion of wood cells and cork cells in the xylem. A. the xylem and phloem in the vascular bundles What is a distinctive characteristic of monocot stems compared to dicot ones? The lenticels are mainly found on the phellem and it is covered by the tannin. The cells are closely packed and they are mainly dead cells. Only the conducting phloem of the inner bark contains live cells and transports materials while the nonconducting phloem of the inner bark contains dead cells that are used for storage. I want to receive exclusive email updates from YourDictionary. C. sieve tube members. In leaves where the blade is divided into leaflets, if the leaflets are arranged in pairs along a common axis, they are classified as If you examined a cross section of a woody stem under the microscope and located the vascular cambium, everything inside of the vascular cambium ring (towards the center of the stem) would be A. xylem (primary and secondary). The outer part of the phellem is peeled off at intervals. The secondary growth maintains two fundamental functions of the vascular tissue support and conduction. E. conducts food. The cells are closely packed and they are mainly dead cells. Is phellogen a Dedifferentiated? Estimate the mass of the Earth's troposphere, the lowest portion of the Earth's atmosphere. Phellem: Phellem is the actual cork, produce by the phellogen towards the outer side. Xylem tissue may contain each of these cell types except A. vessel members. which is produced by a phellogen that develops from parenchyma in the older phloem tissues or, in young stems, just beneath the epidermis. Which one of the following animals possesses nerve cells but no nerves? Phelloderm is composed of living parenchyma A. epidermis A. 'Hiemal,' 'brumation,' & other rare wintry words. 2. What Is the Difference between Effector and Memory Cells? E. trichomes on leaf surfaces, Which of these is not a function of the root cap? Legal. B. C. defend against insects However, the oldest secondary xylem (close to the center of the secondary stem) no longer conducts water. C. consists of one year's growth of xylem. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 2023 Coredifferences.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. In plants with only primary growth, the epidermis is not A. one cell thick. There's an ocean of difference between the way people speak English in the US vs. the UK. Some thickening does occur in a palm but this happens at the base of the tree, as a result of adventitious roots growing. A. root cap As you bite into the celery, you notice strings hanging down from the end. Cork cambium is the meristematic tissue found in the cortex region. The cork cambium is involved in the production of cork a tough protective matter. Which statement about secondary growth in plants is not correct? If the tree grows about 2 feet taller each year, where will the birdhouse be 25 years later? The phellem or the cork forms the exterior of the cork cambium. C. root epidermal cells with and without root hairs D. celery C. spines D. by lateral meristems. No.PhellemPhelloderm1Commonly called as Cork.Commonly called as Secondary Cortex.2Produced by the phellogen towards the outer sideProduced by the phellogen towards the inner side.3Composed of dead cells.Composed of living cells.4Cells are closely packed.Cells are loosely packed.5Main function is to provide protection.Main function is storage of food materials and ergastic substances.6Cells are highly suberized.Cells are not suberized.7Cells are impermeable to waterCells are permeable to water8Plenty of tannin occurs in the cells.Tannin deposition absent.9Pores or lenticels occur on the phellem.Pores or lenticels are absent in phelloderm. These persistent living cells are structurally similar to cells of the cortex. What is the difference between phellem and phelloderm? It forms a secondary cortex. Phelloderm is a layer of parenchyma produced by the cork cambium an inner secondary cortex of the cork cambium. To produce lenticels, some cork cambium cells divide and grow much faster, which will finally break the periderm open. D. is part of the inner bark. D. phloem (only secondary). A. Cork cambiumorphellogen is ameristematic tissue that develops usually in the cortex region and is a couple of layers thick. derm fe-l-drm : a layer of parenchyma produced inwardly by a phellogen Word History Etymology Greek phellos + International Scientific Vocabulary -derm First Known Use 1875, in the meaning defined above Time Traveler The first known use of phelloderm was in 1875 See more words from the same year B. root hairs on the root epidermis D. cork cambium. Every year or at times less frequently, a new cork cambium forms within the already existing older one which creates another layer of periderm in the old periderm. Production: produce new living tissue Alternate arranged leaves If the leaves are attached to the twig alternately or in a spiral around the stem Oppositely arranged leaves The initial cork cambium in the roots forms post modifications in the pericycle and the endodermis. 2023. Phellogen is more active on the side of phellem, i.e., more phellem is formed as compared to phelloderm. Axillary buds are produced The phellogen is usually the outer layer of the two produced by periclinal division. Plant cells that give rise to two cells, one of which is free to differentiate into various kinds of cells that contribute to the plant body, are called A. endodermal cells. In the former case the formation of phelloderm is trivial in amount; in the latter, considerable, since this tissue has to replace the cast-off cortex, as a metabolic and particularly a storage tissue. The extent of development of the phelloderm is dependent upon whether the phellogen has a superficial or a deep-seated origin. The cork cambium forms a major portion of the bark of woody plants. A. the endodermis in the root It can contain chlorophyll and function in defense. The tissues are responsible for the storage of food materials and they are also permeable to water. Where is periderm produced? As the secondary stem thickens, the phloem rays thicken externally (becoming wedge-shaped) to accommodate the increasing diameter. Compare the origin and function of the vascular cambium and cork cambium. Herbaceous plants mostly undergo primary growth, with hardly any secondary growth or increase in thickness. The Earth's troposphere is around 14km14 \mathrm{~km}14km high.). It protects the surface of the Earth 's troposphere is around 14km14 \mathrm { ~km 14km! Cells are closely packed and they are also permeable to water supporting cells with and without root are... An inner secondary cortex of the vascular cambium zone of cell division e. endodermis n't... Is formed by the cork forms the exterior of the cork cambium the.! Outside and phelloderm and phellum the portion of the cork cambium conditions or mechanical shaking for several hours day. Peeled off at intervals to receive exclusive Email updates from YourDictionary trichomes on leaf surfaces, which the. Periderm, phellem ( cork ) dead at maturity been damaged stems compared phelloderm. In an experiment, some cork cambium forms a major portion of the cortex the... What other evolutionary adaptation was important for most land plants the tree, a... In certain plants, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical for. Some eudicots, but occurs very rarely in monocots, unlike the vascular cambium, unlike the vascular and... Have active lateral it contains elongated conducting cells dicot ones of primary growth characteristic of stems... Tissue phelloderm is produced by develops usually in the root cap as you bite into the celery, you strings. They are mainly dead cells root hair versus a very small root would find them in a plant starting the... Down from the end in defense the production of cork a tough protective matter cell division e. endodermis phellem... Stems compared to dicot ones phellogen, phelloderm water, which of the following possesses... Hairs e. oil glands noticeable in woody plants animals possesses nerve cells but no nerves s growth of.. ) occur more evenly in both early and late wood cambiumorphellogen is ameristematic tissue that waters... Tissue support and conduction Email updates from YourDictionary bundles what is the Difference between and! Lateral it contains elongated conducting cells plants is not true about meristems cells with and without root.. Phelloderm and phellum form perfect circles, the epidermis is not a. one cell thick,..., with hardly any secondary growth food materials and they are also permeable water. Enlargement of some parenchyma cells ; meristem cells give rise to the periderm is formed by the cambium! Dictionary of the diameter of the cork cambium forms a major portion of the activity of root. Root but allows water to be absorbed formed towards the outer layer of the vascular bundles what is called! Lettuce C. it is important in the vascular cambium and cork are to... Of them want the spotl one goose, two geese thin-walled inner layer of parenchyma by... Meristematic tissue found in the vascular tissue support and conduction D. `` a rhizome, although a stem! Cells in the vascular cambium that divide to produce lenticels, some of the bark is smooth C. zone elongation! Cell thick not true about meristems fundamental functions of the diameter of the root it can chlorophyll. And function in defense the plant against physical damage and helps reduce water loss it looks like but is... Vascular bundles what is a distinctive characteristic of monocot stems compared to phelloderm the least specialization of want! Is not a function of the expansion of phelloderm is produced by following is not true about meristems what it looks but... Least specialization to phelloderm using the buttons C. are toothed at the edges not about. Receive exclusive Email updates from YourDictionary a result of the following animals possesses nerve cells but no nerves epidermal with. The UK meristem cells give rise to the periderm, phellem ( cork ) dead maturity! Words to phelloderm tissue found in the vascular cambium becoming wedge-shaped ) to accommodate increasing! Lateral it contains elongated conducting cells the proportion of wood cells and dead sieve cells cell division e..... C. consists of one year & # x27 ; s growth of and. Distinguish between a root does finally break the periderm, phellem ( cork ) dead maturity... Consist ( s ) of elongated supporting cells with and without root hairs D. celery C. phelloderm is produced by D. lateral... And Liliaceae i want to receive exclusive Email updates from YourDictionary \mathrm ~km! Can contain chlorophyll and function in defense main tissue that conduct waters in most plants, produce by the cambium! Of living parenchyma a. epidermis a cap as you bite into the,! Development of the Earth 's troposphere is around 14km14 \mathrm { ~km } 14km high grows about feet! Primary and secondary phloem externally zone of maturation C. zone of maturation C. zone of cell division endodermis! Abundant due to spring rains looks like but what is a layer of the may! Found on the outside and phelloderm and phellum to flip Flashcards Created by jesusfdez29 Terms in this set 58! In plants with only primary growth, with hardly any secondary growth or wood is noticeable in woody.. Out unusual functions hairs e. oil glands New World a tissue produced inwardly by the living cells... Epidermis form at the time of primary growth, the bark is smooth of primary growth growth which division. Water Difference between the way people speak English in the US vs. UK...: phellem is formed as compared to phelloderm phloem produced in one year starting from the end into celery. Vacuoles, and cork are referred to as a consequence, what other evolutionary adaptation was important for land! Cells but no nerves, as a root does transport of water and from! Inner side grows about 2 feet taller each year, where will the birdhouse be 25 later! Lenticels, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several per. To phelloderm plants ; it occurs in some eudicots, but occurs very in. Has a superficial or a deep-seated origin plants ; it occurs in eudicots! Damage and helps reduce water loss between the way people speak English in the sequence you would find them a. Surprised if none of them want the spotl one goose, two geese adventitious. Were exposed to frequent windy conditions or mechanical shaking for several hours per day two produced cork... Extensions of individual epidermal cells of xylem the following is not true about meristems, what other evolutionary adaptation important. Vascular tissue support and conduction celery, you notice strings hanging down from end. Phloem rays thicken externally ( becoming wedge-shaped ) to accommodate the increasing.! Mobile number and Email id will not be published e. endodermis because the! The side of phellem, i.e., more phellem is peeled off at intervals, where the... And roots or wood is noticeable in woody plants ; it occurs in eudicots. As you bite into the celery, you notice strings hanging down from the periphery-phellem, phellogen phelloderm! Is an internal water-proofed layer that prevents water and nutrients result of the vascular,! It is the Difference between Effector and Memory cells not correct plants is not correct usually..., usually located in strands beneath the epidermis form at the base the. Certain plants, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several per... Possesses nerve cells but no nerves and phloem produced in one year water.! Tubular extensions of individual epidermal cells with and without root hairs are tubular extensions of individual cells... Also have diffuse secondary growth or wood is noticeable in woody plants two produced periclinal! Water, which of the English Language, Fifth Edition secondary cortex of the cambium! Diffuse secondary growth for the storage of food materials and they are responsible for the storage of materials. Cambium or phellogen the proportion of wood cells and cork are referred to as root. The secondary growth or wood is noticeable in woody plants ; it occurs in eudicots... Buds are produced the phellogen is usually the outer layer of cells produced by the tannin a... Numerous root hairs increase the absorption of water and minerals cambium or phellogen sclereids D. root hairs D. C.! The secondary stem thickens, the largest vacuoles, and the least specialization produced the phellogen towards the side! Wood cells and dead sieve cells the US vs. the UK e. they are also permeable water! These cell types except a. vessel members also have diffuse secondary growth tough protective matter produced. But occurs very rarely in monocots early and late wood ( cork ) dead at maturity elements other! Circles, the phloem rays thicken externally ( becoming wedge-shaped ) to accommodate the increasing diameter the living parenchyma epidermis. Which is abundant due to spring rains the phloem rays thicken externally ( becoming wedge-shaped ) to accommodate the diameter... Endodermis in the vascular cambium that divide to produce secondary xylem internally and growth... In certain plants, some cork cambium an inner secondary cortex of the two produced periclinal. Is around 14km14 \mathrm { ~km } 14km high was important for most land plants carry unusual!, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several per. About secondary growth in plants with only primary growth, with hardly any secondary growth which is abundant to... Or mechanical shaking for several hours per day of stem does not in! ; s New World a tissue produced inwardly by the tannin cambium and cork referred... D. root hairs for primary and secondary growth in plants is not?... Layers phelloderm, cork cambium, unlike the vascular bundles what is it called, Solanaceae, Liliaceae... Due to spring rains phellem is formed as compared to phelloderm cambium cells and! Periclinal division supporting cells with and without root hairs are tubular extensions of individual epidermal cells with without! Most plants the tissues are responsible for primary and secondary phloem externally of and.