LINDMAN, AMERICAN SPECIES OF TRICHOMANES SM. 



41 



fronds. The fullgrown sterile ones very often have an ovate 

 or almost cuneate base, sometimes tapering to the stipes, the 

 upper half more or less widened, ünally of obovate form, and 

 pinnatitid in a few, short, obtuse lobes, which very frequently 



Fijr. 2f). Cellular structure of sonic sjjccies of the sphenoides-gToni^ (X 90). 

 .4 Trich. sphenoides Kze, frond, specimen from French Guiana, Sagot n. 847: B 

 TrirJt, sphenoides, frond, specimen from Matto-Grosso, Exjjcd. 1. Regnell., n. 

 A. 2903* a; C Trick, fontannm Lindm. n. sp., frond, specimen from Rio 

 (i rande do Sul, Exped. 1. Rennen, n A, 1043: D Trick. Mosenil Lindm. 

 n. sp , frond, spec, from Minas Geraes. Mosén, n. 3810: K involucral margin 

 of the same: F Trick. )nyrioneitron Lindm. n. s]i., frond, spec, from French 

 Guiana, Sagot n. 847 ex p.: G involucral margin of the same: H the same, 

 frond, spec, from Rio de Janeiro, Mosén n. 2719*2; J involucral margin of 



the same. 



cover each other with their margins. The fertile frond — 

 as I have found on accessible specimens — is less lobed and 

 often not so large as the sterile one; its base is rounded or 



