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The apparently clear distinction between flowering and flowerless plants has been broken down by the series of gradations between the two exhibited by the Lycopodiaceae, Rhizocarpeae, and Gymnospermeae.
It is only subsequently that the series of remarkable investigations inaugurated by Hofmeister has brought to light the extraordinary and altogether unexpected modifications of the reproductive apparatus in the Lycopodiaceae, the Rhizocarpeae, and the Gymnospermeae, by which the ferns and the mosses are gradually connected with the Phanerogamic division of the vegetable world.
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