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formed of the slightly changed margin of 
the frond. 
Veins forked, free ; pinnaz unequal-sided 
or equal-sided. Getus XI.—Litdsiya Dryand, 
Veins more or less uniting. Pinne un- 
equal-sided or equal-sided. 
Geaus XI1.---Schizoloma Gaud. 
Tripe VI—Preripe 
Sori marginal, oblong or in a line, 
Indusium formed of a more or less changed 
and reflexed margin of the frond opening 
inwardly. 
Sori marginal, rounded or in a line, 
‘usually numerous and distinct, sometimes 
confluent and continuous, bearing the 
sporangia on the underside; veins free. 
Genus XIII—Adiantum L, 
Indusium roundish and distinct, or more 
or less confluent, but not continuous, 
sporangia on the underside of the frond, 
veins free. Geaus XIV.—Cheilanthes Sw. 
Indusium quite continuous, sori linear, 
continuous, occupying a slender filiform 
receptacle in the axis of the indusium. 
Veins free, rarely those of the last division 
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52 
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