. Comparative morphology of Fungi. Fungi. Fig. 45.—Pythium. Forms of sporangium. Pythium gracile. 1. Filament of Vau- cheria with parasite. 2, 3. Vegetative hyphae which have swollen terminally. 4. The protoplasm has passed into a germ sac. 5. Zoospore formation. Pythium proliferum. 6. Zoosporangia. 7. Proliferating zoosporangiferous hyphae. 8 to 11. Germination of zoosporangia. Pythium diacarpum. 12. Habit of fungus on decaying wood. Pythium intermedium. 13, 14. Formation of zoosporangia. Pythium palmivorum. 15. Germinat- ing oospores. (1 X 565; 2 to 5 X 330; 6, 12 X 67; 7 X 100 8 to 11, 13,
. Comparative morphology of Fungi. Fungi. Fig. 45.—Pythium. Forms of sporangium. Pythium gracile. 1. Filament of Vau- cheria with parasite. 2, 3. Vegetative hyphae which have swollen terminally. 4. The protoplasm has passed into a germ sac. 5. Zoospore formation. Pythium proliferum. 6. Zoosporangia. 7. Proliferating zoosporangiferous hyphae. 8 to 11. Germination of zoosporangia. Pythium diacarpum. 12. Habit of fungus on decaying wood. Pythium intermedium. 13, 14. Formation of zoosporangia. Pythium palmivorum. 15. Germinat- ing oospores. (1 X 565; 2 to 5 X 330; 6, 12 X 67; 7 X 100 8 to 11, 13, 14 X 200; 15 X 270; after Butler, 1907.) genus Sphaerosporangium, the characteristic spherical sporangia lead to true conidia; in the section Orthosporangium, , P. proliferum., they always remain attached to the mycelium and germinate in situ (Fig. 45, 6 and 7); here they behave as ordinary sporangia. In the section Meta- sporangium, , P. debaryanum and P. intermedium (Fig. 45, 13 and 14), they may fall off and be disseminated by wind or water as true conidia. In their manner of renewal, also, these two sections may be 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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