200 



LYCOPODIALES 



[CH. 



reaching in rare cases a length of one metre (e.g. S. lepidoden- 

 drifolia) but usually much shorter, possessed a single median 

 bundle, and the lower face was characterised by two stomatal 

 grooves and a median keel. It is not uncommon to find leaf- 

 bases of Sigillaria detached from the stem and preserved as 

 separate impressions. The term Sigillariophyllum used by 



B 



viCi 



^,>K 



m 



Fig. 196. A— C. Sigillaria Brardi. (A after Germar ; B, C after Zeiller.) 



D. Sigillaria laevigata. 



E. Lepidodendron Wortheni (D and E after Zeiller). 



Grand'Eury^ may be applied to detached leaves, though it is 

 by no means easy to distinguish between the foliage of Sigillaria 

 and Lepidodendron. A comparison of a typical species of 

 Sigillaria, such as S. rugosa (fig. 193, B) or S. Brardi 

 (fig. 196, A — C) with a typical Lepidodendron reveals obvious 



1 Grand'Eury (90) A. 



