. Elements of plant anatomy;. Botany -- Anatomy. ANATOMY OF THE CELL. 17 V. A form similar to the fourth, but the scakiriform thick- enings are somewhat irregular. Examples : Reticulated ducts. VI. A modification of the fifth, but the thickened portion of surface is greater than that left thin, and the small thin portions are either circular or lens-shaped. Examples : Ducts ^vith simple and bordered pores. Another class of cells, designed both for conduction of material and for support to the organ containing them, is. Fig. 11. Cross-sections showing Collencbyma. A from stem of Chenopodium alb
. Elements of plant anatomy;. Botany -- Anatomy. ANATOMY OF THE CELL. 17 V. A form similar to the fourth, but the scakiriform thick- enings are somewhat irregular. Examples : Reticulated ducts. VI. A modification of the fifth, but the thickened portion of surface is greater than that left thin, and the small thin portions are either circular or lens-shaped. Examples : Ducts ^vith simple and bordered pores. Another class of cells, designed both for conduction of material and for support to the organ containing them, is. Fig. 11. Cross-sections showing Collencbyma. A from stem of Chenopodium album. B from stem of Sambucus nigra. C from petiole of leaf of Xicotiana maero})hylla. D from stem of Ceratophyllum demersum. E from petiole of leaf of Phytolacca decandra. With the exception of B, the outer limits of the common walls may be seen. A and B x 200. C and E x 400. —(^ccrf. to Wiesner.) known as collenchyma. Cells of this class are generally longer in one direction than in the other two, and the thick- ening takes place along the corners or angles, leaving a narrow portion free for the transmission of contents. Such cells are found especially in portions of plants whose growth in length is not yet finished, wdiile the six classes previously described belong to those parts where growth in length is 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 Gregory, Emily L. Boston, London, Ginn & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotanya, bookyear1895
