TRICHOPHYTONEAE 553 



Colony pure white. 



Colony white cottony, witli liitlial J'olds friietuiing ;it tlie center; on canjuy, inoculable 



to man (licriictic, lesion), not to white mouse. A. patiserinum. 

 Colony ccrebriforni, reverse brownish i^ray; finally crateriform; known only from 



man (position uncertain). A. niveum. 



Colony velvety, rarely powdery, reil pii^incnt diffusing; into medium; on dog, inocu- 

 lable to mouse and man. A. canvnum. 

 Colony moist at fir.«t, showing velvet after 10-12 days, l)econiing dry powdery, sur- 

 face irregular, corrugated. A. africana. 

 Colony brown gray to greenish, glabrous, wit'.i concent rii- rings. 



./. anniilosiiiii. 



Achorion g*ypseum Bodin, Ann. Denn. Syphiligr. 1\', 8: 585-602, 1 yl., 1907 



Tnchophyton du rhien Saboiiraud, Trichophyties Hnm. 114, 1894. 



Sabouraudites (Aleurocloster) gypseus Ota & Langeron, Ann. Parasitol. 

 Hum. Comp. 1: 328, 1923. 



Closterosporia gypsea Grigorakis, Ann. Sci. Nat. Bot. X, 17: 415, 1925. 



Mio'osporum (Closterosporia) gypseum Guiart & Grigorakis, Lyon Med. 

 141 : 377, 1928. 



? Trichophyton gypseum asteroides Souche R.B.S. Biltris, Ann. Inst. 

 Pastenr. 43: 281-358, 15 figs., 1929. 



Producing favus with scutula on cat and horse, very rarely on rats, mice, 

 and men ; also a scutiform mass on the comb of a rooster. In man, kerion and 

 sycosis or only erythematous scaly lesions are more common. Perhaps most 

 frequent on the horse. Occasional in France, Belgium, Germany, and Austria ; 

 rare in Denmark, New York, Sao Paulo in Brazil, and Buenos Aires in Ar- 

 gentina. Perhaps the case reported by Mewborn (1903) on the scrotum and 

 adjacent thigh and of Biltris (1929) from mice and scaly pruriginous lesions 

 on forearm should be referred here. 



On Sabouraud maltose racquet mj'celium, aleurospores, and large clostero- 

 spores are produced. On cereals, spirals and compound thyrses of aleuro- 

 spores are produced, and the cells of the racquet mycelium are less swollen. 

 On soluble starch or dextrin and peptone, closterospores are very abundant 

 but there is no racquet mycelium. The presence of sodium chloride produces 

 very deformed closterospores. Chlamydospores 8-10/a; aleurospores 3-5 x 2.5- 

 3.5/i, cyliiulric, witli the free end rounded, very caducous; closterospores 6-7- 

 septate, 12-13 x 40-60/i,; nodular organs 35-40/i, in diameter. 



Colonies with a small central button. 3 radial folds and a circle of small 

 mammillae about the periphery; center cafe-au-lait, marginal zone white at 10 

 days. At 20 days, lanceolate rays appear at the margins and an eccentric oval 

 furrow, often imperfect, appears; the rays remain cottony while the central 

 portion becomes powdery, often with a small white spot at the center. In a 

 month the pleomorphic velvet resembles the species of Microsporum section 

 Neotnicrosporum. At 37° C. the colony resembles T. plicatile. Reverse reported 

 brown in the center with a white margin. On potato, white, velvety, not color- 

 ing medium. 



