AN ENUMERATION OF CULTIVATED FERNS. 273 



Venules free. Fertile segment a rachiform spite. Sporangia 

 subglobose, sessile, in pedicellate crested whorls (rarely distinct), 

 forming a clustered simple spike, opening vertically by a slit on 

 the exterior side. 



1. H. Zeylanica, HooTc. Gen. Ml. t. 47 B ; Hooh. 2nd Gent. 

 Ferns, t. 94 ; Hook. Gard. Ferns, t. 28. Osmunda 

 Zeylanica, Linn. Helminthostachys dulcis, Kaulf. 

 — Ceylon, Malay, Molucca, Philippine, and other 

 islands. 



157. BOTRYCHIUM, Linn. 



Fronds erect, with dissimilar sterile and fertile segments. 

 Sterile segments foliaceons. deltoid, bi-tripinnatifld'y decom- 



tttniu 1 57.— Portion of barren and fertile segments, natural sizej leruiN 

 enlarged. 



T 



