AN ENUMERATION OF CULTIVATED FERNS. 



283 



axis of the leaves at their base, globose, 1 -celled, traversed by 

 thread-like receptacles of two kinds: — 1. (Antlieridangia), 

 containing numerous small spores ; 2. (Ooplwridangia), con- 

 atining large 4-sided spores. 



Genus iGj. — Plant, natural fcize. No. 1. 



1 I. lacustris, Linn. ; Willd. Sp. PI. 5, p. 534 ; Bolt. Fil. 

 141 ; Schk. Crypt. 1. 173; Eng. Bot. 1084.— Europe, 

 Britain. 



