AN ENUMERATION OP CULTIVATED FERNS. 283 
axis of the leaves at their base, globose, 1 -celled, traversed by 
thread-like receptacles of two kinds : — 1. { Anther idangia), 
containing numerous small spores; 2. ( Oophoridangia ), con- 
atining large 4-sided spores. 
Genus 163.— Plant, natural size. No. 1. 
1. I. laeustris, Linn.; Willd. Sp. PI. 5, p. 534; Bolt. Fil. 
t. 41 ; Sclik. Crypt. 1. 173 ; Eng. Bot. 1084.— Europe, 
Britain. 
