HYrODFRRIS. 31 



GENUS VL 



HYPODERRIS. R. Brown. 



A SOLITARY species, native of the Island of Trinidad. 



The name is from Hypo under, and Derris a skin, in allusion 

 to the attachment of the indusiam, of which a portion is buried 

 under the sori. 



Distinguished from the genus Woodsia, by having reticulated 

 venation; it does not differ in any other respect, except in habit. 



Fronds stipitate, simple, entire, or trilobate. 



Rhizoma creeping. 



Sori circular, irregular, or uniserial on either side of the 

 primary veins, and being formed at the points of confluence 

 of numerous veinlets. 



VOL. VII. 



