. A textbook of botany for colleges and universities ... Botany. 204 JNIORI'IIOLOGY veins that branch dichotomously, except in certain forms with \cry narrow leaves. In some forms the leaves are short and obovate, sug- gesting those of Gink- goales. The structure of the leaves is like those of the cycads, \\ith the very characteristic meso- phyll (see p. 193). In form, therefore, the leaves in general resemble those of the conifers; but in structure they resemble tliose of the cycad line. Strobili. — The strobih are small and monospo- rangiate, both kinds of stroliili usually occurring on the
. A textbook of botany for colleges and universities ... Botany. 204 JNIORI'IIOLOGY veins that branch dichotomously, except in certain forms with \cry narrow leaves. In some forms the leaves are short and obovate, sug- gesting those of Gink- goales. The structure of the leaves is like those of the cycads, \\ith the very characteristic meso- phyll (see p. 193). In form, therefore, the leaves in general resemble those of the conifers; but in structure they resemble tliose of the cycad line. Strobili. — The strobih are small and monospo- rangiate, both kinds of stroliili usually occurring on the same plant (monoe- cious), characters which belong to the conifers. Thev occur in clusters on lateral branches dig. 461), and both kinds are sheathed by bracts. SUiDiinate. —The stam- inate strobilus is made u]j of spirally arranged sterile bracts, among whicli the stamens occur, either soli- tary or groupied near the apex (fig. 462). Each Fig. 4fjr. — Rc-sto.^atlon of DorvrorJaiUs, one of ^ . i i ^ n ^,., ,. ..',. ,, . Stamen is a slender stalk the Cordaitales, showmy the branching' habit, the simple, elongated, parallel-veined leaves, and the bearing a terminal cluster clusters of strobili borne on lateral branches. — .\fter ,,f three to si .X erect SI to- rangia with longitudinal dehiscence. It is only among the Cycadofilicales that such terminal and erect microsporangia are found (cu])ule tyiic, see p. 184). Oviihilc. —The o\-iilatc strobilus i- made up of conspicuous over- lapping brads, in \\hose axils short branches appear, each of which. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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