. A manual of botany. Botany. PTEEiDOPHYTA—FILICiNiE 131 are long, narrow tubes with bluntly pointed ends, and have their sieve-plates more or less regularly arranged along their whole length, being thus marked out into very characteristic areas. They have no companion-cells and no callus. Except in the monostelic stems the bundles are cauline. They are always closed, cambium not being present. Fig. Fig. 887. Section of stele of Fern. The upper part is transverse, the lower longitudinal, e. Endodermis. p, jpericycle. s. t. Sieve-tube. X. Xylem. /. Fibres of bast. The primary root is in a
. A manual of botany. Botany. PTEEiDOPHYTA—FILICiNiE 131 are long, narrow tubes with bluntly pointed ends, and have their sieve-plates more or less regularly arranged along their whole length, being thus marked out into very characteristic areas. They have no companion-cells and no callus. Except in the monostelic stems the bundles are cauline. They are always closed, cambium not being present. Fig. Fig. 887. Section of stele of Fern. The upper part is transverse, the lower longitudinal, e. Endodermis. p, jpericycle. s. t. Sieve-tube. X. Xylem. /. Fibres of bast. The primary root is in all cases developed, but it usually soon perishes, and its work is taken over by adventitious roots which are produced in great numbers from the stem or the leaf-stalks. Each originates in the endodermis of one of the steles, opposite to a xylem bundle. By the formation of two walls a pyramidal apical cell is cut out of one of the cells of the endodermis, and by successive divisions it gives rise to the K 2. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
