. The causes and course of organic evolution; . Fresh-water or Forms M MtlNi: FntlMS. Fig. 11.—Genealogical free ol Plant Genera ancl Groups as deterniineii by recent and fossil Forms. Ciroup names often contracted. CHAPTER XII THE EVOLUTION OF PLANTS (Continued) The oft-expressed view that the ocean has been the greatcenter and originator of Hving bodies is ahnost wholly nega-tived when a study of the bacteria and fungi in general ismade. For, since practically all of these depend on organicfood for sustenance, it might be supposed that many marineplants and animals would habitually be
. The causes and course of organic evolution; . Fresh-water or Forms M MtlNi: FntlMS. Fig. 11.—Genealogical free ol Plant Genera ancl Groups as deterniineii by recent and fossil Forms. Ciroup names often contracted. CHAPTER XII THE EVOLUTION OF PLANTS (Continued) The oft-expressed view that the ocean has been the greatcenter and originator of Hving bodies is ahnost wholly nega-tived when a study of the bacteria and fungi in general ismade. For, since practically all of these depend on organicfood for sustenance, it might be supposed that many marineplants and animals would habitually be associated Tvith def-inite bacterial or fungoid plants. But, comparatively speak-ing, they are almost wholly absent from the sea. For, whileat the present day 31 genera and about 600 species of bacterialive in fresh or brackish water, or saprophytically and para-sitically on land plants and animals, only four genera andabout 50 species are marine. Again, while 2670 genera and about 24,000 species of fungiare distributed over land or swamp areas, the estimate is gen-erous which would p
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