TRICHOPHYTONEAE 537 



MICKOSPORUM 



Microsporum Gruby, C. R. Acad. Sci. Paris 17: 301-303, 1843. 



Sadouraudites Ota & Langeron, Ann. Parasitol. Hum. Comp. 1: 326-329, 

 1923 (pro parte majore). 



Closterosporia Grigorakis (pro parte majore), Ann. Sci. Nat. Bot. X, 7: 

 411, 1925. 



Type species: Microsporum Audouini Gruby. Type of Sabouraudites and 

 Closterosporia is Microsporum lanosum Sabouraud. 



Closterospores present, rare in a few species; chlamydospores present; 

 aleurospores rare ; in lesions, hair surrounded by a sheath of small arthrospores 

 irregularly arranged, never in chains as in Ectotrichophyton; hair breaks 

 several millimeters above the scalp. 



The genus is easily separable into three well-defined subgenera: Neomi- 

 crosporum, for the species with a wide range of hosts, usually found on domestic 

 animals but inoculable to man causing inflammatory lesions ; Kamhayashia for 

 species producing tinea capitis microsporica with some inflammation and con- 

 fined to the yellow race ; and Eumicrosporum for species with greater adapta- 

 tion to a single host, usually the white race of man. For further differences, 

 see key, below. If the genus should be split at some future time, Sahouraudifes 

 must be used for the section Neomicrosporum and Microsporum for the section 

 Eumicrosporum. For further discussion of lesions, see p. 444, for phylogeny. 

 see p. 461. 



Key to Microsporum 



Closterospores abundant, growth rapid, pleomorphism usually present, all ages of hosts at- 

 tacked, not only in the scalp but on the glabrous skin, producing inflammation and 

 sycosis (or even keribn by M. felinewm) ; in domestic animals involving the hairy 

 areas; easily inoculable into guinea pigs. neomicrosporum. 



Colony reddish, closterospores poorly developed on Equidae, very rare and atypical on 

 man. 

 Colony wine red, crateriform, both concentric and radial folds outside the crater; 

 reverse wine red with a yellowish margin; pleomorphism not noted; France. 



M. rwbrum. 



Colony reddish ochre, nearly glabrous, center a slight folded crater with numerous 

 radial folds not elevated above the general level of the medium, a yellow 

 pigment spreading over the surface of the medium; on potato, yellow or 

 brown closterospores, 25-35 x 18-20At, 1-4-ceried; Europe, Java, Uruguay. 



M. equinum. 

 Colony yellow then vermilion, finally pleomorphic ; closterospores not described, aleuro- 

 spores abundant; disseminated folliculitis in boy of 14, Brazil. 



M. Eamosii. 

 Colony brownish or buff. 



Disc woolly or powdery, not glabrous. 



Colon J' chamois, slight central crater with numerous radial folds; reverse chamois 

 with a line of deeper color connecting the outer ends of the rays, the 

 margin lighter; on conservation agar, reverse yellowish with a rose 

 colored zone just inside the margin; on mule, Algeria. 



M. marginat'wm. 



