374 



FILICALES 



[CH. 



tree-ferns. The English example described by Carruthers* 

 from Upper Greensand beds in Dorsetshire (now in the British 

 Museum) shows only the external features. The sandstone cast 



Fig. 278. A. LaccojHeris polypodioides,'Broiign. [From a specimen (39275) in 

 the British Museum ; slightly reduced.] 



B. L. Muensteri. 



C. Dicksonia (petiole stele). 



D. Onychiopsis Mantelli (fertile segments). 



E. Hausmannia Sewardi Kicht. 



F. H. Kohbnanni Rioht. 



G. H. Protopteris Witteana, Schenk. (x, xylem ; B, roots.) 



(B, after Schenk ; E, F, after Eichter.) 



1 Carruthers (65) PI. xiii. 



