. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. MORPHOLOGY AND CLASSIFICATION US cies. The common aspergilU belong here. The basidiomycetes are characterized by the occurrence of a spore-bearing cell, the basidium, which bears four protuberances called sterigmata (singular sterigma) upon each of which is a single spore. Mush- rooms and puff-balls belong to this group. Besides these three well-defined classes, there are many kinds of molds and fungi con- cerning which defin
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. MORPHOLOGY AND CLASSIFICATION US cies. The common aspergilU belong here. The basidiomycetes are characterized by the occurrence of a spore-bearing cell, the basidium, which bears four protuberances called sterigmata (singular sterigma) upon each of which is a single spore. Mush- rooms and puff-balls belong to this group. Besides these three well-defined classes, there are many kinds of molds and fungi con- cerning which definite knowledge is still too incomplete for them to be finally placed. These are designated as imperfect fungi,. Fig. 62.—Yeast cells stained with fuchsin. ( Xiooo.) Fungi imperfecti, or perhaps best by the class name, Hypho- mycetes. In these forms, zygospores and ascospores are un- known; the hyphae are often septate. Reproduction takes place by the formation of conidia only. These are oval or rounded cells produced by transverse division of a filament, usually as a row of conidia at the end of a hypha. The common oidium and many parasitic molds belong in this class. The molds^ are es- pecially important as causes of disease in plants. Relatively few 1 For fuller discussion of molds in general see Marshall, Microbiology, article by Thorn. 10. 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 MacNeal, Ward J. , 1881-1946; Williams, Herbert Upham, 1866-. Philadelphia, P. Blakiston's Son & Co.
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