XX] 



RECENT FERNS 



299 



It is noteworthy that while certain vegetative features may 

 in some cases be cited as family-characters, such features are 

 not usually of much value from a taxonomic point of view. 



Fio. 232. Davallia aculeata. (| nat. size.) 



While the typical tree ferns are practically all members of the 

 Cyatheaceae, a few members of other families, e.g. Tudea harhara 

 (Osmundaceae) and the monotypic Indian genus Brainea (Pol}- 



