Excerpt from The American Naturalist, 1909, Vol. 43
After the plant has reached about a decimeter in length the basal cone ceases to increase and later is lost in the growth of the stipe (fig. At the same time the disc begins to enlarge and spread out on the substratum, giv ing a firmer hold for the increasing lamina above. This enlargement is clearly in the region of the primitive disc and not in the conical basal swelling above, which remains part of the stipe. These two tendencies of growth work ing together usually cause the sharp distinction between the holdfast and stipe to reappear, and in plants more than 15 cm. Long the conical base is seldom prominent (fig. In adults the disc becomes very flat and thin by its continued extension (fig. Has. 7-11. Bentrewia. Series at young plants showing the devempment of the basal cone. Four fifths natural size.
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