Adiantaceae

Indusium absent. Sori marginal, borne on the vein-tips, ± confluent. Stipes and rhachises black or dark red-brown Adiantaceae

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False indusium covering and bearing the sorus, consisting of a sharply reflexed, flap formed by the lamina(Fig. 17). Rhachises and stipes black or dark brown Adiantum

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Each ultimate frond-segment attached by a very short stalk at the lower corner of the segment, dimidiate

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Sori in deep notches between the lobes of the ultimate leaf-segments. Rhizome usually short and tufted

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Sori in shallow grooves at the tips of the lobes of the ultimate frond-segments, not in the notches between the lobes, Rhizome long-creeping