. Fossil plants : for students of botany and geology . Paleobotany. xxxvi] CYCADEOIDEA 399 consisting of the radially elongated cells (figs. 524, 525, ar; 527, c). The superficial layer assumes a different aspect in the micropylar region, its cells being thicker walled, as are also those of the sub- epidermal layer (fig. 524, A and B). The micropylar canal Fig. 525. Cycadeoidea {Bennettites) Morierei. Section of a seed and adjacent inter- seminal scales, tm, micropylar tube; n, nuoellar beak in the micropylar canal, cm; cp, pollen-chamber; co, archegonia (?); em, position of the embryo; c
. Fossil plants : for students of botany and geology . Paleobotany. xxxvi] CYCADEOIDEA 399 consisting of the radially elongated cells (figs. 524, 525, ar; 527, c). The superficial layer assumes a different aspect in the micropylar region, its cells being thicker walled, as are also those of the sub- epidermal layer (fig. 524, A and B). The micropylar canal Fig. 525. Cycadeoidea {Bennettites) Morierei. Section of a seed and adjacent inter- seminal scales, tm, micropylar tube; n, nuoellar beak in the micropylar canal, cm; cp, pollen-chamber; co, archegonia (?); em, position of the embryo; ch, ohalaza; dn, remains of the nuceUus; af, fibrous layer passing below into the shell, eg, and the peduncle, T/; tefe, fleshy layer; or, radial and tubular layers represented in the peduncle by the tubular envelope at; Ec, swollen ends of the interseminal scales. (From a drawing kindly supplied by Prof. Lignier; X 10.) (figs. 524, 525, cm) is cylindrical in the lower part but at the apex is reduced to a long and narrow slit bounded by an internal epidermis of radially stretched cells which in the lower portion of the tube are thinner walled and isodiametric. The rest of the testa is differentiated iato two regions; an outer. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
