AN ENHMERATION OF CULTJIVATED FEENS. 



273 



venules free. Fertile segment a, rachiform 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. Zeylaniea, Eooh. Gen. Fit i. 47 B ; Hook, 'imd Cent. 

 Ferns, t. 94; Eooh. Gard. Ferns, f 28. Osmund a 

 Zeylaniea, I/rnn. Helmiuthostachys dulcis, Kaulf. 

 — Ceylon, Malay, Molucca, Philippine, and other 

 islands. 



157. BOTEYCHITJM, Linn. 



Fronds erect, with dissimilar sterile and fertile segments. 

 Sterile segments foliaoeous. deltoid, bi-tripinnatifidly decom- 



Genns 157. 



-Portion of barren and fertile segmeuts, naturaf size; fertile 

 enlarged. 



