Synopsis of Genera 



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SUB-ORDER I. GLEICHENIACE^E 



Sori dorsal, without indusium, com- 

 posed of a few sporangia having a trans- 

 verse or obliquely transverse complete 

 ring and opening vertically. 



Caudex creeping ; stipes forked ; seg- 

 ments small, almost round or pectinate. 



Genus I. Gleicheaia R. Br. .27 



SUB-ORDER II. POLYPODIACE^E 



Sori dorsal or marginal with or without 

 an indusium ; sporangia stalked, provided 

 with a vertical more or less complete ring 

 and opening transversely (except in Hyme- 

 nophyllese). 



(A) Involucrata 



Sori furnished with an indusium (except 

 in Alsophila). 



