. Heredity and evolution in plants . f FIG. 16.—Portion of a leaf of a fern (Tcctoria cicutaria) thatbulbils on both the upper and lower surfaces of its leaves. Plantlctsdevelop from the bulbils while they are still attached. and demonstrate clearly that foliage-leaves may be pro-duced by the sterilization of spore-bearing leaves. Theinteresting question here naturally arises as to whether, inthe evolutionary development of the plant kingdom LIFE HISTORY OF A FERN.

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