Identifier: textbookofbotany00sach (find matches)
Title: Text-book of botany, morphological and physiological
Year: 1875 (1870s)
Authors: Sachs, Julius, 1832-1897 Bennett, Alfred W. (Alfred William), 1833-1902 Thiselton-Dyer, William T. (William Turner), 1843-1928
Subjects: Botany
Publisher: Oxford, Clarendon Press
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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erior of the basal tissue of the leaf-sheath, upon radii of the stem which alter-nate with the fibro-vascular bundles, and thus also with the teeth of the sheath.A root may arise beneath the bud of each branch; both break through the leaf-sheath at its base. All the joints of the axis agree in these respects, however theymay be modified as underground rhizomes, tubers, ascending stems, leafy branches,or sporangiferous axes. EQUISETACE^. 36: The end of the stem enveloped by a large number of younger leaf-sheathsterminates in a large apical cell, the upper wall of which is arched in a sphericalmanner, while below and at the side it is bounded by three almost plane walls.The apical cell has therefore the form of an inverted triangular pyramid, theupturned basal surface of which is a nearly equilateral spherical triangle. Thesegments are cut off by walls which are parallel to the oblique sides of the apicalcell, that is, to the youngest primary walls of the segment; the segments, disposed
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FIG. 273.—^ ongitudinal section of the end of a stem in an under^ound bud of Equisetum Tehnatein; S apical cell, xy firstindication of the girdle from which the leaves are subsequently formed, b b s. more advanced and distinctly marked foliargirdle, bs the apical cells of a strongly projecting foliar girdle, rr rudiment of the cortical tissue of the internodes, gg rowsof cells from which the leaf-tissue and its fibro-vascular bundle proceed, zzthe lower layers of cells of the segment which takeno part in the formation of leaves (from nature); B horizontal projection of the apical view of the end of a stem of E. Telmateia;s apical cell, /—Kthe successive segments, the older ones still further divided; C horizontal projection of the apical view ofE. a-rvetise; D optical longitudmal section of the end of a very slender stem ; E transverse section of the end of a stem after theformation of the vertical and first tangential walls. (C, D, E, after Cramer; the Roman numerals indicate the

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