The structure & development of the mosses and ferns (Archegoniatae) . leusis unusually small in Marsilia,which otherwise resemblesPilularia. The phenomena of fecunda-tion are very striking in theMarsiliacese. The mucilagin-ous layer about the macrospore attracts and retains thespermatozoids, which collect by hundreds about it. Themucilage above the archegonium forms a deep funnel, whichbecomes completely filled with the spermatozoids. As thesedie their bodies become much stretched out, so that theylook very different from the active ones, with their closelyplaced coils. The attractive substanc
The structure & development of the mosses and ferns (Archegoniatae) . leusis unusually small in Marsilia,which otherwise resemblesPilularia. The phenomena of fecunda-tion are very striking in theMarsiliacese. The mucilagin-ous layer about the macrospore attracts and retains thespermatozoids, which collect by hundreds about it. Themucilage above the archegonium forms a deep funnel, whichbecomes completely filled with the spermatozoids. As thesedie their bodies become much stretched out, so that theylook very different from the active ones, with their closelyplaced coils. The attractive substance here is not confinedto the material sent out from the open archegonium, as the 4o6 MOSSES AND FERNS CHAP. spermatozoids collect in equal numbers about those which arestill closed, and even about spores that have not germinatedat all. Marsilia did not prove a good subject for studyingthe behaviour of the spermatozoid within the &^^, owing tothe difficulty of differentiating the spermatozoid after itsentrance. Pilularia is better in this respect, and shows that.
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
