TRICHOPHYTONEAE 503 



Closterospores and aleurospores abundant, spirals only in the pleomorphic 

 mycelium where they are somewhat more slender and flatter than is usual in 

 this group. 



Colony a white powdery disc, umbilicate, with radial furrows, later the 

 center becomes umbonate, margin of immersed rays, more pronounced on 

 glucose where it is separated from the rest of the colony by a glabrous zone. 

 Pleomorphism in 3 weeks; the subcultures still have a suggestion of the form 

 of the original colony, but are much more irregular. On Sabouraud conserva- 

 tion agar, glabrous, yellow, moist, no velvet, at first a flattened cupola, 

 periphery cut by radial folds which increase in number as the colony ages, 

 margin becomes powdery, center with tufts of short yellow hyphae. 



Ectotrichophyton scorteum (Priestley) Dodge, n. comb. 



Microsporum scorteum Priestley, Ann. Trop. Med. Parasitol. 8: 113-118, 

 PI. 7, 1914. 



Sahouraudites scorteus Brumpt, Precis Parasitol. ed. 4, 1295, 1927. 



Producing inflamed areas of the calf in a 15-year-old boy, no scaliness; 

 hairs appeared normal to the naked eye, slight pruritus, lesions disappeared 

 in about a month after scrubbing with soap and water. The description of 

 the original lesion suggests Ectotrichophyton rather than Microsporum. 



On hairs, very little mycelium and few spores. In cultures, closterospores 

 2-5 septate, 35-60 x ll-14/i,, singly or in terminal groups of 6-8, smooth, ends 

 without spines ; aleurospores scanty, 3-4 x 2-3/t, no compound thyrses ; chlamy- 

 dospores rare; nodular organs present; spirals in pleomorphic mycelium, not 

 in the primary mycelium, somewhat irregular and flattened ; pectinate hyphae 

 rare. 



Growth rapid (1 cm. in 2 days) whitish at first, fluffy on fifth day, light 

 cinnamon with white margin, suggesting the rough side of a piece of chamois, 

 margins uneven, surface rough without folds, slight boss in center; color 

 deepening gradually; pleomorphism after 2 months. On nutrient agar, growth 

 slow, roughness less marked, almost white. On nutrient broth, growth rapid 

 on surface, deep cinnamon, folded. No acid or gas produced from sugars. 

 Milk slowly digested without previous clotting. 



Priestley considered this species close to M. julvum, but the morphologic 

 and cultural characters seem to be more tjqDical of Ectotrichophyton. Ap- 

 parently the species is veiy close to E. farinulentum, but is less virulent and 

 differs in cultural characters. 



Ectotrichophyton circuluscentricmn (Magalhaes) Dodge, n. comb. 



Microsporum circuluscentricum Magalhaes, C. R. Soc. Biol. 90: 53-55, 1924; 

 Mem. Inst. Oswaldo Cruz 21: 173-188, Pis. 18-23, 1928. 



Isolated from a case of tinea capitis, ectothrix type on a child of 16 months 

 in Brazil. 



Closterospores very rare, only 2-celled, 23 x 7/*; terminal and lateral 

 chlamydospores 10.5/a; thyrses of conidia 3.5/*, mycelium 2.3/a; a few spirals 

 present, readily breaking up into arthrospores. [The crude figures suggest, 

 the beginning of a sexual act.] 



