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 



■"*-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=) B. 



