210 
but one or mecre or less connected by 
arching veins at the very base. 
Genus XV.—Pteris L. 
_ Fronds triangular or halberd-shaped or 
palmately divided; veins copiously anas- 
tomosing, without free included veinlets. 
The rest as in Pteris. 
Geaus XVI.—Doryopteris J. Smith 
Veins copiously anastomosing with free 
included veinlets. The rest as in Pteris. 
Geaus XVII-—Lithobrochia Presl. 
Fertile fronds with the segrnents forked 
and pod-shaped. Sori linear, marginal, 
almost parallel. Veins of sterile frond 
transversely elongated and distantly anas- 
tomosing. Genus XVIII.—Ceratopteris Brong, 
TriBpe VII.—BLECHNEE 
Sori linear, oblong, parallel with the 
midrib and margin, nearer the midrib; 
indusium linear, opening towards the 
midrib. 
Sori linear, mostly continucus, parallel 
to and quite close to the midrib; veins 
free, Genus XIX.—Blechnum L. 
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