. Plants and their ways in South Africa. Botany; Botany. 82 Plants and their Ways in South Africa activity is first evident. Once the ring is formed it lays down wood to the inside, phloem to the outside, with medullary rays at intervals, much as secondary thickening takes place in a stem. When cork is formed, it also takes its rise in the Fig. 78.âCross section of bean root, diagrammatic, a. Primary ', with outer piliferous layer, and inner endodermis ; /', pericycle ; <-, primary xylem ; t/, primary phloem ; e, a ruig of cambium formed of ground tissue between the phloe
. Plants and their ways in South Africa. Botany; Botany. 82 Plants and their Ways in South Africa activity is first evident. Once the ring is formed it lays down wood to the inside, phloem to the outside, with medullary rays at intervals, much as secondary thickening takes place in a stem. When cork is formed, it also takes its rise in the Fig. 78.âCross section of bean root, diagrammatic, a. Primary ', with outer piliferous layer, and inner endodermis ; /', pericycle ; <-, primary xylem ; t/, primary phloem ; e, a ruig of cambium formed of ground tissue between the phloem and xylem. and of pericycle outside the points of protoxyleni ; j\ secondary phloem ; o-, secondary xylem ; li, primary medullary rays : /'' peri- cycle which has formed an outer layer of cork, and secondary cortex within ; a' remains of primary cortex cut off by the cork. and in time cuts off the entire cortex; so that a root in which considerable secondary growth has taken place, may show very little actual increase in diameter, as in C, Fig. 78. The tissues of roots and stems will be understood better by tabulating them :â The primary meristem J' Dcrmatogen Periblcm Plerome chives rise to Epidermic Epidermal system CHypodermis Cortical tissue General cortex Endodermis Stele Ground tissue rPericvcle â Medulla I Medullary System of ground tissue. i Phloem \ Vascular -. Xylem '^Vascular bundles \ Vascular I system cambium J. 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 Stoneman, Bertha. London, New York, Longmans, Green
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1915
