AN ENUMERATION OF CULTIVATED FERNS. 



273 



veimles free. Fertile segment a racliiform spike. 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, Hook. Gen. Fil t. 47 B ; Hook. 2nd Cent. 

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

 Zeylanica, Linn. Helminthostachys dulcis, Kaulf. 

 Ceylon, Malay, Molucca, Philippine, and other 

 islands. 



157. BOTBYCHIUM, Linn. 



Fronds erect, with dissimilar sterile and fertile segments. 

 Sterile segments foliaceous, deltoid, bi-tripinnatifidly decom- 



Genus 157. Portion of barren and fertile segments, natural size; fertile 

 enlarged. 



T 



