Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 653
pese (or Pepper-worts), which eitherfloat on the surface or creep along shallow bottoms. These all agreein having two kinds of spore, produced in separate sporanges ; thelarger, or megaspores, giving origin to prothallia which producearchegones only; and the smaller, or microspores,… … Fig. 465.—Spores of Equisetum, with their elaters. shadowing of the mode in which the generative process is performedin flowering plants, the microspore obviously corresponding tothe pollen-grain, while the 1 megaspore may be considered to repre-sent the primitive cell of the ovule. Another…
Microscopy
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