. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 42 Structure and Classification of Micro-organisms Mucors are not infrequent organisms of the atmosphere and occasionally appear as contaminations upon solid culture-media. About 130 species are known. Of these, Mucor corymbifer, Mucor rhizopodiformis, Mucor ramosus, Mucor pusillus, Mucor septatus, and Mucor conoides are said by Plant* to be pathogenic when introduced into laboratory animals. Mucor corymbifer has been known to produce inflammation of the
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 42 Structure and Classification of Micro-organisms Mucors are not infrequent organisms of the atmosphere and occasionally appear as contaminations upon solid culture-media. About 130 species are known. Of these, Mucor corymbifer, Mucor rhizopodiformis, Mucor ramosus, Mucor pusillus, Mucor septatus, and Mucor conoides are said by Plant* to be pathogenic when introduced into laboratory animals. Mucor corymbifer has been known to produce inflammation of the external auditory meatus in General mucor mycosis in man has also been observed by PaltaufJ to result from the presence of the same organism. 4. Aspergillus and Eurotium.—The organisms of this genus are included among the Ascomycetes. They are common organisms of. Fig. 12.—Mucor mucedo. DifEerent stages in the formation and germination of the zygospore: i, Two conjugating branches in contact; 2, septation of the conjugating cells (o) from the suspensors (6); 3, more advanced stage in the development of the conjugating cells (a); 4, ripe zygospore (J) between^ the suspensors {a); 5, germinating zygospore with a germ-tube bearing a sporangium. (After Brefeld.) the air and frequent contaminations of solid culture-media. To secure them an agar-agar plate can be exposed to the atmosphere of the laboratory for a short time, then covered and stood aside for a day or two, when tangled mycelial growths with rapidly spreading hyphae will usually be discovered. The recognition is easily made when the sporangia appear. These are well shown in the accom- panying illustration. The mycelium is divided into many cells. Reproduction is asexual and takes place through conidia spores. The fruit hyphs, which are aerial, terminate in rounded extremities which are known as columella, from which many radiating sterig- mata arise, each terminating in a series of rounded spores. A sexual * K
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