. Fossil plants : for students of botany and geology . Paleobotany. XLn] PSYGMOPHYLLFM 85 dopsis ginkgoides var. Svessmilchi; they are probably referable to Psygmofhyllum. Psygmophyllum WilUamsoni Nathorst. A species^ founded on imperfect leaves from the Upper Devonian of Spitzbergen agreeing closely in shape and venation with P. flabellatum. This is the oldest European example of the genus. In answer to an enquiry with regard to the venation Prof. Nathorst kindly informed me that he was unable to detect any definite traces of anastomosis and that the veins agree in their spacing with those of
. Fossil plants : for students of botany and geology . Paleobotany. XLn] PSYGMOPHYLLFM 85 dopsis ginkgoides var. Svessmilchi; they are probably referable to Psygmofhyllum. Psygmophyllum WilUamsoni Nathorst. A species^ founded on imperfect leaves from the Upper Devonian of Spitzbergen agreeing closely in shape and venation with P. flabellatum. This is the oldest European example of the genus. In answer to an enquiry with regard to the venation Prof. Nathorst kindly informed me that he was unable to detect any definite traces of anastomosis and that the veins agree in their spacing with those of P. Fig. 667. Psygmophyllum Kidsloni. From Vereeniging, S. Africa. (\ nat. size.) Psygmophyllum majus Arber. The large flabellate leaves^, often more than 16 cm. long and 15 cm. broad, representing this Lower Carboniferous or Upper Devonian species from Newfoundland, are distinguished from P. flabellatum by their broader and less kite-like lamina and by the coarser venation. The distal margin is almost entire or characterised by broad and shallow lobes: as in P. WilUamsoni no axis occurs with the leaves. As Arber points out, this species 1 Nathorst (94) A, PI. ii. figs. 1, 2; Arber (12) PI. XLn. fig. 4. 2 Arber (12) p. 392, Pis. xlii.— 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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