. Fossil plants : for students of botany and geology . Paleobotany. XX] EUFILICINEAE 283 I. Leptosporangiate Filicales. In these homosporous and heteiosporous plants the sporangia are developed from single epidermal cells. (a) Eufilicineae. The sporangia bear spores of one kind only; the wall of a sporangium consists of one layer of cells. In. Fig. 220. Young fronds of (A) Angiopteris evecta and (B) Cycas revohita. (Beduced.) the great majority of cases the sporangia are characterised by the possession of a conspicuous row of thick-walled brown cells, the annulus\ which serves as a mechanism f
. Fossil plants : for students of botany and geology . Paleobotany. XX] EUFILICINEAE 283 I. Leptosporangiate Filicales. In these homosporous and heteiosporous plants the sporangia are developed from single epidermal cells. (a) Eufilicineae. The sporangia bear spores of one kind only; the wall of a sporangium consists of one layer of cells. In. Fig. 220. Young fronds of (A) Angiopteris evecta and (B) Cycas revohita. (Beduced.) the great majority of cases the sporangia are characterised by the possession of a conspicuous row of thick-walled brown cells, the annulus\ which serves as a mechanism for dehiscence and spore-dispersal. The fertile leaves, identical in form with 1 For an account of the mechanism of spore-dispersal, see Goebel (05) p. 587; Atkinson (94); Leolerc du Sablon (85); and Bower (00).. 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
