The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 Fig. 509. A young prothallus of a Maiden-hair, moderately enlarged, and an older one with the first fern-leaf developed from near the notch. 510. Middle por- tion of the young one, nmcli magnified, sliowinic below, partly among tlie rootlets, the nntheridia or fertilizing organs, and above, near the notch, tliiee pistillidia to be fertilized.

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