Text-book of structural and physiological botany . Fig. 474.—^Tangential section through the wood of the maple ; g vessels ; Hy wood-fibres ; s silver-grain { x 200). wood-cdls^ wood-fibres, simple bast-like wood-fibres, orlibriform fibres—-are always fusiform, comparatively stronglythickened and lignified, unbranched, and, as a rule, furnished special Morphology and Classification, 365 with extremely small bordered pits (Fig. 14, p. 13). Evenwhen the latter are larger, they differ in size and form fromthose of the vessels which occur along with them. The. Fig. 473. — Transverse section throug
Text-book of structural and physiological botany . Fig. 474.—^Tangential section through the wood of the maple ; g vessels ; Hy wood-fibres ; s silver-grain { x 200). wood-cdls^ wood-fibres, simple bast-like wood-fibres, orlibriform fibres—-are always fusiform, comparatively stronglythickened and lignified, unbranched, and, as a rule, furnished special Morphology and Classification, 365 with extremely small bordered pits (Fig. 14, p. 13). Evenwhen the latter are larger, they differ in size and form fromthose of the vessels which occur along with them. The. Fig. 473. — Transverse section through the wood of the oak ; ii/ strongly thickened wood-fit res ; h/ parenchyma of the xylem; s fibresof the silver-grain ; g small vessels ; adjoining g is a very large vessel,the size of which is only slightly indicated by the curved border-line. wood-cells of the inner spring-wood are, as a rule, much lessstrongly thickened than those of the outer autumn-wood(Fig. 479, p. 373). There is nowhere found in the wood-cells 366 Stntctiwal and Physiological Botany. any strongly developed spiral thickening, nor usually eventhe spiral striation already mentioned (p. 16). In the winter,especially when vegetation is dormant, they usually containstarch. It is comparatively rare for the wood-cells tobecome septated, when their thickening-layers are nearlycompletely formed, by one, still more rare by several parti-tion-walls, into daughter-cells, which are then enclosed by thethick-walled wood-cells^ and are termed septated rarely
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