to the Genera.] XXIV.—CRYPTOGAMIA. 163 
Ring of a pone complete, the sporangia opening 
down the side ; sori latera 
aitted ferns with al or forked fronds 
_ 1147. Schizea. 
Climbing ferns with palmate, pinnatifid or pinnate fronds 
1148. Lygodium. 
Ring of sporangia equatoria. 
eating 0 of sporangia ra oeeinls transverse; sporangia 
opening vertically ; sori with few sporangia, dorsal, indusium 
0; climbing ferns with dichotomously branching fronds 
1125. Gleichenia. 
ng of sporangia more or less complete, jointed, eae; 
ree usually bursting transversely; sori with many 
sporangia, dorsal or marginal :— 
boda sori without an indusitim Vide hense 1126. Alsophila. 
Herbs :— 
+Sori furnished with an indusium :—[p. 164} 
Fronds delicately i ORT ppreeree indusium 
apical on a vein, tubular.........--- . Trichomanes. 
{Sori marginal or submarginal :—[p. 1 
ear ium opening iiealty towards edge of 
sori | disorete: indusium apical or subapical on 
1128. Dayallia. 
in 
Sori in a ‘continuous or subcontinuous marginal 
or submarginal line; indusium double, the 
inner valve membranous ...--- 1129. Lindsaya. 
Indusium opening inwardly towards midrib of 
frond :— 
Sporangia on the underside of the indusium, 
which cpokidle of the pares margin of the 
frond 130. Adiantum. 
Sporangia not on the underside au the indusium ; 
the veins supporting the sori or their receptacles 
in: 
Sori terminal or nearly 80, oD np distinet veins, 
globose and, at least at . discrete 
1. Cheilanthes. 
Sori on a slender nites ate in the 
axis of the indusium, con nnecting several to 
many veins, linear and continuous :— 
