56 
reflexed margin of the frond opening in- 
wardly. 
Genus XIII.—Apbiantum L, 
(Deriv. Gr. Adtantos, dry ; from the curious 
property of repelling moisture.) 
Sori marginal, rounded or in a line, usually 
numerous and distinct, sometimes confluent 
and continuous, bearing the sporangia on the 
underside ; veins free. 
(a) Radicantes Group—Frond simply 
pinnate, rachis rooting at the apex. 
(t) Pinnz half-moon shaped, distinctly 
stalked, 3-4 inch by 14-1 inch. 
Texture herbaceous. 
, 1. A. lunulatum, 
(tt) Pinnze wedge-shaped at the base, 
nearly sessile, $—} inch by } inch. 
Texture leathery. 
2. A. caudatum. 
(0) Polysorous Group.—Frond once or 
more pinnate; sori numerous, roundish, 
oblong or transversely kidney-shaped. 
