. Elementary botany . Fig. 22.;. ryo of fern (Adiantum concinnum) in enlarged venter of the archegonium. S leaf or cotyledon ; A\ root ; F, foot. Young embryo of fern (Adiantum stem ; /., first completely dependent on the sexual stage lor Its nourishment, remaining at- tached permanently throughout all it^ development, by means of the organ called a toot, ,uid it die- after the spores are mature. 377. Now in the ferns we see several striking differences. In the first pi,ice. as we have already observed, the spore-bearing phase (sporophyte) of

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany