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The Origin of the different classes of the Higher Cryptogamia.
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The Sub-kingdom of the higher Spore-plants, the Cryptogamia possessing a vascular system, was more prominent in early geological periods than at present.
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It would appear then that the first class consisted of seedless plants, i. e. of the cryptogamia.
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But the cryptogamia, in general, thrive best when they are protected from the direct rays of the sun.
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As the conditions of the earth changed, the cryptogamia seemed to have dwindled away, while higher forms of vegetation asserted their supremacy.
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(W. Hofmeister, "On the Germination, Development and Fructification of the Higher Cryptogamia", Ray Society, London, 1862.