Abstract

When the tuber germinates, leaves of the mature shape and roots are produced, usually from the growing end (Pl. 6, figs. 5, 6, 7). Even if a considerable portion of the end is cut off (P1. 6, fig. 8) juvenile leaves are not formed by the new plant. Runners are produced at an early stage, from which a number of plants may originate (Fig. 9). Under favorable conditions of culture only about a year is required for growing a mature plant. Since Nephrolepis cordifolia produces tubers and runners in great abundance, its chances for success in nature are much greater than those ferns which lack such propagules.

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