516 



MEDICAL MYCOLOGY 



Isolated from lesions on a bull from Cameronn, which had been sent to 

 Paris for experimental work on piroplasmosis. The encrusted areas were 

 about 4x6 cm., occasionally bearing tufts of healthy hair within the areas. 

 Crusts about 4-7 mm. thick in the center, thinner toward the edges, not very 

 adherent. Hairs gray, covered by a spore sheath and broken only 2-3 mm. 

 above the skin. Cells in sheath cylindric 5-6/x in diameter, thick-walled, united 

 into dichotomous hyphae. Spores in chains, spherical or ellipsoid, 6-8/x in 

 diameter, the chains soon disappearing. The crust results from an enormous 

 hypertrophy of the horny layer, the epidermis is dissociated by the extravasa- 

 tion of serum in certain points and at other points invaded by polynuclears 

 which sometimes form small abscesses, especially at the surface of the epi- 



Fig. 86. — FavotricJwphyton camerounense. 1, hyphal tips showing branching suggesting 

 favic candelabra ; %-Jt, short lateral branches suggesting' aleurospores ; 5, 6, pedicellate chlamy- 

 dospores ; 7, arthrospores ; 8, chain of arthrospores suggesting a closterospore. (After Ota & 

 Gaillard 1926.) 



dermis in contact with the horny layer. The dermis is infiltrated by mononu- 

 clears, especially in the vicinity of the follicles. Sometimes the follicles them- 

 selves are invaded by the polynuclears. Inoculable to guinea pig, producing 

 a small evanescent lesion, with only a few hairs invaded and a few scales, 

 healing spontaneously in a few days. 



In cultures, arthrospores in chains, of variable size up to 12//, in diameter, 

 sometimes chains resemble closterospores in general form, but nothing is known 

 of their cytology (Fig. 86, 7,8). The hyphae are about 4/a in diameter, septate, 

 branched, not flexuous. Sometimes very short lateral branches are formed, 

 which suggest young aleurospores, but these are not abjointed, and never 

 mature to spores (Fig. 86, 2, 3). Sometimes the terminal portion is branched, 



