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Much like the last, but the rather larger fronds puberulent beneath with minute jointed hairs and stalked glands; indusium deeply cleft into narrow segments ending in jointed hairs.—Rocky places, Minn., southward and westward.

Wheeler, however, compares with the “dorsal organ” the peculiar extra embryonic membrane or indusium which he has observed between serosa and amnion in the embryo of the grasshopper Xiphidium.

In Maidenhair-Ferns a little lobe of the leaf is folded back over each fruit-dot, to serve as its shield or indusium.

When the fruit is ripe, the indusium is something of a lilac colour, spotting the frond in double rows—as you see it there.

Pinnules divided into minute, densely crowded segments, the herbaceous margin recurved and forming an almost continuous indusium.