. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 58 THE ARCHAEOPTERIS FLORA [en. writer 1 some years ago. The large wedge-shaped leaves are in most cases detached, except in specimens from the Middle Devonian of \Vestern Norway, and much younger examples from the Coal Measures of the Newcastle coal field, England, and the Permo-carboniferous of South Africa, where they are borne spirally on a shoot. The Devonian and the British (Carboniferous) examples agree remarkably in habit in this respect. Although several species of the genus are known, we remain entirely
. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 58 THE ARCHAEOPTERIS FLORA [en. writer 1 some years ago. The large wedge-shaped leaves are in most cases detached, except in specimens from the Middle Devonian of \Vestern Norway, and much younger examples from the Coal Measures of the Newcastle coal field, England, and the Permo-carboniferous of South Africa, where they are borne spirally on a shoot. The Devonian and the British (Carboniferous) examples agree remarkably in habit in this respect. Although several species of the genus are known, we remain entirely unacquainted with the Fig. 30. Archaeopteris fiuibriata, Natli., from the Upjier Devonian of Bear Island, (f nat. size.) After Nathorst (1902). It has been thought jDrobable that PsygmophijUuin belongs to a distinct group of plants, for which the name PalaeophyHales was suggested by the writer some years ago. Whether this view will prove to be correct or not, depends primarily on the nature of the unknown fructification. Until this has been discovered it is probably wiser to assimie that it represents a distinct tj^pe than to include it with any other Palaeozoic genus, for among such plants the habit of Psygmophyllum is quite unique, 1 Ar])er (1912). To complete the lists contained in this monograph the figures of Plaly]>hyllii)ti Brozviiifniiim of D. White (1905), of P. obtusa by Prosser (1894), PI. II,and those of Nathorst from Western Norway, Nathorst (), should be added. It is now admitted that the Permian types from Russia at one time included in this genus are in reality quite 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
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