. Embryogenesis in plants. Embryology. Fig. 20. Psilotum triquetrum A-D, Stages in the embryonic development as seen in longitudinal section; I-I, first partition wall; a, neck of archegonium; s, shoot segment; /, foot segment; aw, apical meristem. (A-C, x 137; D, x 50; after Holloway). to the Psilophytales, the rootless, leafless fossils, Rhynia and Psilophytoih it has been generally accepted that the living Psilotales, of which no immediate or direct fossil ancestors are known, are simple and primitive plant organisations which have remained relatively unchanged over vast periods of tim
. Embryogenesis in plants. Embryology. Fig. 20. Psilotum triquetrum A-D, Stages in the embryonic development as seen in longitudinal section; I-I, first partition wall; a, neck of archegonium; s, shoot segment; /, foot segment; aw, apical meristem. (A-C, x 137; D, x 50; after Holloway). to the Psilophytales, the rootless, leafless fossils, Rhynia and Psilophytoih it has been generally accepted that the living Psilotales, of which no immediate or direct fossil ancestors are known, are simple and primitive plant organisations which have remained relatively unchanged over vast periods of time; Psilotum is rootless and leafless because in its ancestors these organs never had been evolved. As noted above, however, Psilotum does possess small scale leaves,. 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 Wardlaw, C. W. (Claude Wilson), 1901-. London, Methuen; New York, Wiley
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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
