. Botany; principles and problems. Botany. Fig. 167.—^Zfewgo, one of the Peronosporales. A, section through a leaf-blade showing portion of a "blister" produced by the fungus. The hyphae penetrate between the cells of the leaf, sending into them small, sucker-like structures. Under the epidermis are produced rows of conidia. B, sexual organs, the anther- idial filament (at right) discharging a male nucleus into the oogonium, at left. by the wind. Non-sexual, aerial spores produced in this manner are called conidia, and are of frequent occurrence among fungi. Sexual organs appear in t
. Botany; principles and problems. Botany. Fig. 167.—^Zfewgo, one of the Peronosporales. A, section through a leaf-blade showing portion of a "blister" produced by the fungus. The hyphae penetrate between the cells of the leaf, sending into them small, sucker-like structures. Under the epidermis are produced rows of conidia. B, sexual organs, the anther- idial filament (at right) discharging a male nucleus into the oogonium, at left. by the wind. Non-sexual, aerial spores produced in this manner are called conidia, and are of frequent occurrence among fungi. Sexual organs appear in the deeper tissues. The egg nucleus in the oogonium is fertilized by a male nucleus from an adjacent antheridial filament, and a thick-walled oospore is formed. Such destructive plant parasites as the potato blight and the grapevine mildew belong to this order. Ascomycetes or Sac Fungi.—This enormous group of plants includes over 20,000 species. They show but little resemblance to the algae, and although all must have come originally from some chlorophyll-bearing forms, their exact ancestry is not clear. These fungi are typically land-inhabiting plants and include both saprophytic and parasitic species. Both groups differ from the Phycomycetes in the fact that their hyphae are divided into cells by cross-walls, and that sexual processes are much reduced or altogether lacking. The plant body commonly consists. 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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