Synopsis of Genera 
SUB-ORDER I.—GLEICHENIACE® 
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. 
Geaus 1.—Gleichexia R. Br. 
SUB-ORDER II.—POLYPODIACE/: 
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- 
nophy]lez). 
(A) Involucrata 
Sori furnished with an indusium (except 
in Alsophila). 
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