. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 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, si^orangia 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 L
. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 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, si^orangia 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 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 Arber, E. A. Newell (Edward Alexander Newell), 1870-1918; Arber, Agnes Robertson, 1879-1960. Cambridge, The University Press
Size: 1399px × 1786px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishercambr, bookyear1921
