. Comparative morphology of Fungi. Fungi. 74 COMPARATIVE MORPHOLOGY OF FUNGI ally fill up the whole host cell like a knot. Biologically, from the simpler to the higher forms, there is an increased adaptation to parasitism. Pythium and Phytophthora kill the infected tissue, Albugo and Perono- spora only stimulate it to hypertrophy or to storage of food. Some species of both these genera winter over in the rhizomes of the host and penetrate the whole shoot. Some species of Peronospora in flowers seem to grow up the stem as intercellular parasites and only develop their conidiophores on the corol
. Comparative morphology of Fungi. Fungi. 74 COMPARATIVE MORPHOLOGY OF FUNGI ally fill up the whole host cell like a knot. Biologically, from the simpler to the higher forms, there is an increased adaptation to parasitism. Pythium and Phytophthora kill the infected tissue, Albugo and Perono- spora only stimulate it to hypertrophy or to storage of food. Some species of both these genera winter over in the rhizomes of the host and penetrate the whole shoot. Some species of Peronospora in flowers seem to grow up the stem as intercellular parasites and only develop their conidiophores on the corolla. Furthermore, most species of Pythium and Phytophthora are plurivorous and may be cultivated on artificial media; Albugo and Peronospora are much more specialized and will not grow saprophytically. Asexual reproduction takes place by sporangia which, even in the most highly metamorphosed form, are cut off as multinucleate structures nit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 1895-. New York [etc. ] McGraw-Hill Book Company, Inc.
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