84 GENERA OF UNCERTAIN POSITION [CH. 



with that of the Permian species named by Saporta Ginkgophyllum 

 Grasserti (fig. 669) and his figure 1 of that type suggests a shoot 

 rather than part of a compound frond. Some species referred by 

 authors to Psygmophyllum are certainly pinnae, while others bear 

 a closer resemblance to shoots with simple leaves. Until better 

 material is available we cannot determine either the morphological 

 nature or the systematic position of the various examples assigned 

 to this provisional genus. 



Psygmophyllum Kolderupi Nathorst. 



Nathorst 2 has recently founded this species, naming it after 

 Dr Kolderup, on specimens from Devonian strata in West Norway 

 consisting of pieces of shoots, or possibly compound fronds, 

 bearing spirally disposed fan-like leaves or leaflets on long stalks 

 and reaching a breadth of 15 to 30 mm. ; the veins are fine and 

 repeatedly forked. The habit appears to be similar to that of 

 Psygmophyllum flabellatum, but it is hardly possible to say whether 

 we are dealing with fragments of a frond or branches bearin 

 simple leaves. 





Psygmophyllum Kidstoni Seward. 



This species, very similar to P. flabellatum, is founded 

 specimens discovered by Mr Leslie in the Permo-Carboniferous 

 rocks at Vereeniging, South Africa 3 . The cuneate leaves reach a 

 length of 13 cm. and in some cases are deeply divided into two 

 truncate lobes (fig. 667). The veins appear to be identical with 

 those of P. flabellatum though no definite anastomosing has been 

 detected. A photograph recently received of a new specimen 

 shows some indication of a few cross veins, but the occasional 

 anastomosing of veins should not be regarded as a feature of great 

 importance. The axis of this species is broader than any so far 

 found in the case of the English species, and the leaves are attached 

 by a similar decurrent base. Incomplete leaves similar to P. 

 Kidstoni though probably not specifically identical are described 

 by Dun 4 from Permo-Carboniferous strata at Sydney as RJiipi- 



1 Saporta (84) PL 152, fig. 2. 



2 Nathorst (15) p. 25, PL I. figs. 611; PL IT. figs. 25. 



3 Seward (03) B. p. 93, PL xn. ; Arber (05) B. p. 213.. fig. 47. 



4 Dun (10) PI. 51. 



