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Life-History of Ferns

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Life-History of Ferns. A, Germinating Spore of Polypodium Vulgare: sp, Exospore; k, First Root-Hair. B, The Same Later. C, Young Prothallus of Aspidium: sp, Spore; pr, Prothallus. D, Under-Surface of the Same Later: pr, Prothallus; w, Root-Hairs; an, Antheridia; ar, Archegonia. E, Antheridium of Bracken (Pteris), Bursting: sp, Antherozoid Escaping from Spermatocyte. F, Archegonium of the Same, Unopen: h, Mucilaginous Canal-Cell; e, Central Cell. G, Section through a Pinnule of the Frond and Sorus of Aspidium: b, Mesophyll; sch, Indusium; sp, Sporangium; st, its Stalk; r, Annulus. H, Pinnule of Pteris, showing Veins and Sori. J, The Same in Asplenium. K, The Same in Polypodium (Sori Naked). L, The Same in Aspidium. Illustration for The New Popular Educator (Cassell, 1891).

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