Archive image from page 82 of Devonian floras; a study of. Devonian floras; a study of the origin of Cormophyta . devonianflorasst00arbe Year: 1921 V] RHACOPTERIS AND SPHENOPTERIDIUM 61 Rhacopteris, Schimper, 1872 (Fig. 33). Fronds pinnate or dichotomously branched. Pinnules large, unsymmetrically wedge-shaped, rhoniboidal, typieally entire or more or less deeply lobed or divided longitudinally, Avith a radiating un- symmetrical nervation. Higher part of the frond sometimes fertile, siorangia tnfted, small, exannulate, globular. This genus is very rare in the Devonian, though it appears to oc
Archive image from page 82 of Devonian floras; a study of. Devonian floras; a study of the origin of Cormophyta . devonianflorasst00arbe Year: 1921 V] RHACOPTERIS AND SPHENOPTERIDIUM 61 Rhacopteris, Schimper, 1872 (Fig. 33). Fronds pinnate or dichotomously branched. Pinnules large, unsymmetrically wedge-shaped, rhoniboidal, typieally entire or more or less deeply lobed or divided longitudinally, Avith a radiating un- symmetrical nervation. Higher part of the frond sometimes fertile, siorangia tnfted, small, exannulate, globular. This genus is very rare in the Devonian, though it appears to occiu- on that horizon in German3\ It is more characteristic of the Lower Carboniferous. Distribution. Upper Devonian to Middle Coal Measures.
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Keywords: 1920, 1921, arber_agnes_robertson_1879_1960, arber_e_a_newell_edward_alexander_newell_1870_1918, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, cambridge_the_university_press, drawing, historical, history, illustration, image, page, paleobotany_devonian, picture, print, reference, vintage
