. Fossil plants : for students of botany and geology . Paleobotany. 86 GENEEA OF UNCEETAIN POSITION [CH. bears some resemblance to PsygmopJiyllum Brownii originally described by Dawson ^ as Cyclopteris Brownii from Upper Devonian strata in Maine. Psygmophyllum Haydeni Seward. In 1905 some incomplete specimens were described from Permo-Carboniferous rocks in Kashmir as Psygmophyllum sp.^ for which, on the discovery of better material, a specific name was proposed^. The leaves reach a length of 13 cm. and are charac- terised by the division of the lamina into six or more obcuneate â "*-NC -
. Fossil plants : for students of botany and geology . Paleobotany. 86 GENEEA OF UNCEETAIN POSITION [CH. bears some resemblance to PsygmopJiyllum Brownii originally described by Dawson ^ as Cyclopteris Brownii from Upper Devonian strata in Maine. Psygmophyllum Haydeni Seward. In 1905 some incomplete specimens were described from Permo-Carboniferous rocks in Kashmir as Psygmophyllum sp.^ for which, on the discovery of better material, a specific name was proposed^. The leaves reach a length of 13 cm. and are charac- terised by the division of the lamina into six or more obcuneate â "*-NC -* ^^^**&^ ^. Fig. 668. Psygmophyllum Haydeni. (Nat. size.) segments, the divisions sometimes extending to the base of the broad part of the leaf (fig. 668). In the upper part of the lamina there are three to four veins per millimetre but lower in the lamina the veins are 1 mm. apart. Dr Arber* suggests that this species should rather be referred to Ginkgophyllum or Rhipidopsis. Psygmophyllum Hollandi Seward. This less satisfactory species is represented by some imperfect leaves from Carboniferous rocks of Kashmir^. The lamina is 1 Dawson (63) PI. xvn. fig. 6. ^ Seward and Woodward (05) B. 3 Seward (07^) B. « Arber (12) p. 400 (footnote). ^ geward (07=) 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
