66 PTERIDOSPERMEAE [CH. 



the integument. The lack of anatomical data in both these seeds 

 is a reason for the substitution of some less committal term than 

 Lagenostoma. 



Grand'Eury^ and Carpentier^ have published accounts of 

 impressions of seeds from the Coal Measures of France compared 

 by them with species of Lagenostoma though not assigned to new 

 species. These and similar seeds should be referred to Nathorst's 

 ^enus Lagenospermum. 



The difficulty of recognising the true nature of seed-like 

 impressions is illustrated by some specimens in the Goldenberg 

 collection in Stockholm described by Arber* as Carpolithus 

 Nathorsti : these consist of pieces of Sphenopteris pinnae probably, 

 as ZeiUer suggested, Sphenopteris Schaumburg-Lippeana (Stur) 

 bearing at the ends of the segments of deeply divided pinnules 

 what appeared to be seeds 1 mm. long, oval and longitudinally 

 ribbed, and possibly enclosed in a cupule. Arber considered 

 the 'seeds' to be related to Lagenostoma, probably belonging to 

 isome member of the Lyginopterideae. An examination of the 

 specimens by Nathorst* showed that the supposed seeds are 

 collections of spores; but whether the spores of a true Fern 

 or the microspores of a Pteridosperm cannot be determined. 



Pterispermostrobus Stopes. 



Pterispermostrobus bifurcatus Stopes. 



Dr Stopes^ has recently called attention to a resemblance 

 between specimens from the Westphalian of New Brunswick, 

 described by her as Pterispermostrobus bifurcatus, and Lageno- 

 spermum Sindairi. The New Brunswick fossil is made the type 

 of a new genus Pterispermostrobus, which is employed for fructi- 

 fications of Pteridosperms that cannot be associated with a known 

 species of parent and may be either seeds or complex male organs 

 borne on a definitely branched rachis. The type-species is repre- 

 sented by a slender axis bearing lateral branches divided into 

 two widely divergent arms each of which bears a terminal body, 



1 Grand'Eury (05^) B. 2 Carpentier (11). 



= Arber, E. A. N. (08). 



" Nathorst (08) p. 10, PI. 11. Bgs. 19—21. 



= Stopes (14) p. 74, Pis. xvii. fig. 45, xxv. fig. 69, text-fig. 15. 



