56 



reflexed margin of the frond opening in- 

 wardly. 



GENUS XIII. ADIANTUM L. 



(Deriv. Gr. Adiantos, 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. 



(i) Pinnae half-moon shaped, distinctly 

 stalked, |-J inch by i|-i inch. 

 Texture herbaceous. 



1. A. lunulatum. 



(ii} Pinnae wedge-shaped at the base, 

 nearly sessile, i-f inch by J inch. 

 Texture leathery. 



2. A. caudatum. 



(bj Polysorous Group. Frond once or 

 more pinnate ; sori numerous, roundish, 

 oblong or transversely kidney-shaped. 



