﻿The North American species of Psilogramme* 



In describing not long ago a new and peculiar species of 

 Psilogramme from Porto Rico, it became apparent that the other 

 North American members of the genus (mainly Costa Rican), 

 though treated recently,! were not well understood. Still more 

 recently an apparently undescribed species has been received from 

 Chiapas, extending widely the known continental range of the 

 genus. This has led to a further examination of the entire 

 genus, with particular regard to the North American species. 

 Some of the notes taken are given under the following provisional 

 list of species now reported from North America, 

 is essentially that of Kuhn's classification. t 



primary rachis straight or subflexuous; primary pinnae 



Rhizome very slender (i to 2.5 mm. thick), wide-creeping, 



Rhizome thick, ascending or decumbent, the fronds 

 fasciculate. 

 Lamina pale yellowish or grayish green, densely 

 spreading-villose throughout; pinnae rigidly her- 



membrano-chartaceous, distant or subdistant , 



Fronds very much larger, scandent or recumbent, tardily 

 determinate; lamina ample, the primary rachis widely 

 sinuose-flexuose or strongly divaricate-flexuose; pri- 



e only at a broad angle o 



