. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. HYPHOMYCETES 641 the hairy portions of the body of man and some domestic animals. In man, it is foimd most frequently in undernom-ished children upon the scalp. It is a disease of extremely chronic course and is very resistant to treatment. Beginning as a small erythematous spot, it soon develops into small sulphur-yellow cupped crusts, which are placed usually about the base of a hair. These may spread and coalesce. The small inden- tated crust is spoken of as a scutulum. When such a
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. HYPHOMYCETES 641 the hairy portions of the body of man and some domestic animals. In man, it is foimd most frequently in undernom-ished children upon the scalp. It is a disease of extremely chronic course and is very resistant to treatment. Beginning as a small erythematous spot, it soon develops into small sulphur-yellow cupped crusts, which are placed usually about the base of a hair. These may spread and coalesce. The small inden- tated crust is spoken of as a scutulum. When such a scutulum is re- moved and examined under a microscope, teased out in a few drops of strong sodiiun hydrate solution (20 per cent), the incitant of the disease may be easily recognized and studied. In such a preparation the cen-. FlG. 150.—Aspergillus glaucus. m. Mycelial threads, s. Sterigmata. r. Ascospore. p. Germinating conidium. A. Ascus. (After de Bary.) ter of the scutulum is foimd to be made up chiefly of small doubly- contoured spores which are irregularly oval or round, and may be ar- ranged in chains, lying scattered among an extremely dense meshwork of fine mycehal threads. Toward the periphery of the scutulum, the spores are less numerous and the looser arrangement of the meshwork permits us to distinguish distinct filaments of mycelia which give off hyphse, the ends of which are often swollen into small knobs. The interior of the scutulum usually contains a pure culture of the fungus. Many varieties of achorion have been described, but Plaut^ believes that, at the present time, it is not possible to separate these from one * Plaul, in Kolle und Wassennann's "Handbucb," 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 Hiss, Philip Hanson, 1868-1913; Zinsser, Hans, 1878-1940. joint
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