TRICHOPHYTONEAE 505 



Growth rapid (10 cm. in 6 weeks), central dome cut by deep furrows, 

 lanceolate rays rudimentary, disc white, powdery ; on Sabouraud glucose agar, 

 center round, elevated, with powdery rays, then umbilicate with lanceolate 

 rays which increase in number, covered with white powder where they reach 

 the surface of the medium. Pleomorphism in 4-5 weeks ; reverse reddish. On 

 Sabouraud conservation agar, the colony resembles lunar craters, somewhat 

 irregular, covered with the same floury powder as on carbohydrate media but 

 less abundantly. Pleomorphic colony a disc of velvet, sometimes umbilicate 

 at the center. First subcultures of pleomorphic mycelium yield colonies in- 

 termediate between the typical primary colony and the pleomorphic colony, 

 but successive subcultures yield colonies increasingly like the typical pleo- 

 morphic colony, finally becoming a completely sterile mycelium. On potato, a 

 thick whitish streak, slightly velvety. 



Langeron & Milochevitch would reduce Ectotrichophyton radiolatum, E. 

 granulosnm, and Epidermophyton interdigitale to synonyms with this species. 

 Since their microscopic characters are close, they are conceived as being 

 heterothallic strains of this species. 



Var. radiolatum (Bruhns & Alexander) Dodge, n. comb. 



Trichophyton gypseum var. radiolatum Bruhns & Alexander in Jadassohn, 

 Handbuch d. Haut- u. Geschlechtskrankh. 11: 175, 176, 1928. 



Trichophyton radiolatum Sabouraud, Maladies du cuir chevelu 3: 355, 

 356, 617-621, 1910. 



Ectotrichophyton {Microtrichophyton) radiolatum Castellani & Chalmers, 

 Man. Trop. Med. ed. 3, 1006, 1919. 



Bah our audit es radiolatus Ota & Langeron, Ann. Parasitol. Hum. Comp. 

 1: 328, 1923. 



Microsporum (Closterosporia) radiolatum, Guiart & Grigorakis, Lyon Med. 

 Ul: 377, 1928. 



f Cercosporella vexans Massee apud Russ, Lancet 204: 77, 78, 2 figs., 1923. 



Producing kerions and vesicopustular lesions in man. Easily inoculable 

 into guinea pig and rabbit, producing ectothrix type of lesions which healed 

 spontaneously in about 6 weeks (Catanei 1933). Rare, but recently showing 

 increase of frequency in Schlesien, Germany. 



Microscopically as in T. mentagrophytes. Tips of hyphae often show 

 clavate enlargements as in Microsporum. 



At first colonies similar to those of E. mentagrophytes, white, less pure, 

 somewhat rose color. On maltose agar, center more regularly rounded. On 

 glucose agar, rays less sword-shaped and more confused. Pleomorphism in 

 3-4 weeks, colony with shallow radial furrows while none in E. mentagrophytes. 

 [Further cultural notes on various media by Catanei, 1928.] On coagulated 

 serum, colonies whitish, moist, smooth, except for margin which is chalky and 

 bears the aleurospores. Catanei (1933) reports three types of pleomorphic 

 colonies : the usual type with a craterif orm center which develops radial fur- 

 rows, finally becoming almost cerebriform, with fewer aleurospores, so that 



