. College botany; structure, physiology and economics of plants. Botany. ROOTS 65 The axis cylinder consists of the xylem and phloem,' which are an-anged: radially and alternate. The xylem is in the center of the root with branches that project outward towards the sur- face, giving it a star-like appearance in crossrsection. The phloem lies between these projections. The tissues of which they. Fia. 43.âSeedling showing â soil'held by root-haira. Fig. 44.âCross-section of rootlet showing root-hairs. are composed serve the same functions as in the stems. In the older roots, a cambium is develope
. College botany; structure, physiology and economics of plants. Botany. ROOTS 65 The axis cylinder consists of the xylem and phloem,' which are an-anged: radially and alternate. The xylem is in the center of the root with branches that project outward towards the sur- face, giving it a star-like appearance in crossrsection. The phloem lies between these projections. The tissues of which they. Fia. 43.âSeedling showing â soil'held by root-haira. Fig. 44.âCross-section of rootlet showing root-hairs. are composed serve the same functions as in the stems. In the older roots, a cambium is developed which gives rise to secondary xylem and phloem as shown in the diagram. The endodermis is a more or less definite sheath of starch-bearing cells surrouiid- ing the axis cylinder and probably corresponds to the starch sheath of the The cortex is a broad zone of piarenchyma cells which frequently serve for storage of reserve food materials, 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
