LITERATURE 177 



Although some investigators have claimed to cultivate the fungus 

 it is evident that most of the fungi isolated in culture have been 

 contaminants. 



Erythrasma. Erythrasma is an affection of the moist skin areas 

 of the axillae and groin. It is characterized by a brownish to reddish 

 discoloration. The fungus appears in the epidermal scales as very 

 minute (about 1 micron in diameter) branched hyphae and spores. 

 It is generally referred to as Microsporon niinutissimum, but there 

 seems to be little doubt that it is one of the actinomycetes. 



Piedra. Piedra, or trichosporosis, is an affection of the hairs, not 

 actually a dermatophytosis, occurring in tropical climates. Masses 

 of fungus mycelium grow as little hard knobs on the hairs. Black 

 piedra is caused by an Ascomycete, Piedraia Hortai. White piedra 

 is caused by Trichosporon Beigelii. Both fungi are most common 

 in tropical regions of high humidity. 



LITERATURE 



1. BoxAR, L., and A. D. Dreyer, Studies on ringworm funguses with reference 



to public health problems, Am. J. Puh. Health, 22, 909 (1932). 



2. Catanei, a., Etudes sur les teignes, Arch. inst. Pasteur, 11, 267 (1933). 



3. Davidson, A. M., and P. H. Gregory, Note on an investigation into the 



fluorescence of hairs infected by certain fungi, Can. J. Research, 7, 378 

 (1932). 



4. , The so-called mosaic fungus as an intercellular deposit of cholesterol 



crystals, J. Ayn. Med. Assoc, 105, 1262 (1935). 



5. Emmons, C. W., Pleomorphism and variation in the dermatophytes, Arch. 



Dermatol. Syphilol. (Chicago), 25, 987 (1932). 



6. , Dermatophytes : natural grouping based on the form of the spores and 



accessory organs, Arch. Dermatol. Syphilol. (Chicago). 30, 337 (1934). 



7. Emmons, C. W., and A. Hollaender, The action of ultraviolet radiation 



on dermatophytes. II. Mutations induced in cultures of dermatophytes 

 by exposure of spores to ultraviolet radiation, Am. J. Botany, 26, 467 

 (1939). 



8. Gregory, P. H., The dermatophytes, Biol. Rev., Cambndge Phil. Soc, 10, 



208 (1935). 



9. GuiART, J., and L. Grigorakis, La classification botanique des champignons 



des teignes, Lyo7i med., 141, 369 (1928). 



10. Kaufman N-WoLFF, M., tjber Pilzerkrankungen der Hiinde und Fiisse, Der- 



matol. Z, 21, 385 (1914). 



11. Legge, R. T., L. Bonar, and H. J. Templeton, Epidermomycosis at the U^ni- 



versity of California, Arch. Dermatol. Syphilol. (Chicago), 27, 12 (1933). 



12. Matruchot, L., and C. D.^ssonville, Sur le champignon de I'herpes (Tricho- 



phyton) et les formes voisines, et sur la classification des Ascomycetes, 

 Bull. soc. mycol. France, 15, 240 (1899). 



