. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. HYPHOMYCETES 639 moisture is present. In laboratories they are frequently found as con- taminants, and in order to procure them for purposes of study it is only necessary to expose agar or gelatin plates in a dusty, dark corner. In households they are frequently found growing in store-rooms upon stale bread, shoes, leather trunks, and on remnants of food. Most of them prefer an acid environment and are dependent upon a free supply of oxygen. At room temperature they grow more readily t
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. HYPHOMYCETES 639 moisture is present. In laboratories they are frequently found as con- taminants, and in order to procure them for purposes of study it is only necessary to expose agar or gelatin plates in a dusty, dark corner. In households they are frequently found growing in store-rooms upon stale bread, shoes, leather trunks, and on remnants of food. Most of them prefer an acid environment and are dependent upon a free supply of oxygen. At room temperature they grow more readily than at the usual incubator temperature. DISEASES CAUSED BY HYPHOMYCETES Pityriasis versicolor (Microsporon furfur).—Pityriasis is a disease of the skin observed chiefly among persons living under conditions of uncleanliness, or among those who combine these conditions with a tendency to profuse perspiration. It begins as a small, light brown or yellowish patch upon the skin of the abdomen, breast, or back, is flat and barely raised from the cuta- neous surface. It spreads and coalesces with similar spots until the entire area resembles strongly the figures of a map with irregular continents and islands. The disease does not penetrate into the skin itself, but consists, as Plant has pointed out, of a simple sapro- phytism of the inciting agent upon the skin. The condition is caused by a member of the group of Hyphomycetes, discovered in 1846 by Eichstedt, and later named Micro- sporon furfur. The microorganism consists of a dense meshwork of mycelial threads, from which septate hyphae arise in large numbers. From the ends of these, spores arise in rows, after the manner depicted for penicillium (Fig. 149). The hyphae, accord- ing to Unna,i show a characteristic bending at right angles, due to a slight flattening of their diameters. Characteristic of the micro- sporon proper, in preparations made from cutaneous scrapings, are the fragments of bent hyphae and the large numbers o
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkandlondonda
