TRICHOPHYTONEAE 499 



and represented by the clavate hyphal tips, as Grigorakis has shown the 

 gradual disappearance of closterospores following repeated subcultures on 

 artificial media. 



Colony light gray, becoming blue gray, center depressed with about 20 

 flexuous furrows and folds which disappear before the margin is reached. 

 Margin gray white, smooth, without radiations. Pleomorphism in 2 weeks, 

 not starting from center, diameter of 8 cm. in 4 weeks. On conservation agar, 

 center irregularly depressed and fissured, radial folds straight, less numerous 

 and sharp, pure white. 



Ectotrichophyton griseum (Fischer) Dodge, n. comb. 



Triclioph]jion griaeum F. Fischer, Verb. Berliner Derm. Ges. 1909, 1910: 

 112, 1910. Prytek, Arch. Derm. Syphilis 113: 826, 1912; W. Fischer, Derm. 

 Woch. 57: 1400-1402. PI. 11, Figs. 1 and 2, 1913; not Vasconcellos, 1914. 



From a superficial lesion, 5x7 cm., infiltrated, Avith few scales on the 

 forearm. Inoculation of guinea pig showed severe ectothrix lesion, spontane- 

 ous healing in 3 weeks. Original case supposed to have been contracted from 

 dog, not proved. Germany. 



Closterospores, many celled, often in chains, terminal and intercalary^ 

 chlamydospores and aleurospores present but no spirals. 



Growth rapid, central white down in 2-3 days, with a surrounding thin 

 white mycelium. The central portion umbilicate, dark brown surrounded by 

 a circular white plateau, which is soon gray green, becoming lighter and 

 taking on a yellowish tone. This in turn is surrounded by a younger gray 

 green zone with an outer zone of white radiations. Pleomorphism in 3 weeks. 



Var. brasiliense, Dodge, n. var. 



TncJiophyton griseum Vasconcellos, ^lem. Inst. Oswaldo Cruz 6: 11-17, 

 Pis. 2, 3, 1914; not W. Fischer, 1913. 



Sahouraudites griseus Ota & Langeron, Ann. Parasitol. Hum. Comp. 1: 

 328, 1923. 



Lesion 3x4 cm. on forearm, a plateau covered with scales as in lichen 

 planus, grayish yellow, vesicles around margin, scales formed by the rupture 

 of the vesicles. Brazil. Priestley (1917) reports it from a case of onychomy- 

 cosis in Australia. 



Closterospores and aleurospores present. 



Colony a flat white velvety disc becoming gray with a white border; in 

 6 weeks forming concentric zones of depressions and elevations about a center 

 of irregular depressions traversed by elevations, radial furrows sometimes 

 reaching the margin. On Sabouraud glucose agar, same as above, but lighter 

 gray, concentric zones more distinct, central elevation less marked; reverse 

 somewhat violaceous, pigment diffusing into the medium. On Sabouraud con- 

 servation agar with 3% peptone, as above, but zones still more marked and 

 no central elevation. On potato, colony gray spreading over surface of 

 medium, rapidly pleomorphic. On carrot, white or light yelloAv colony, growth 

 rapid and soon pleomorphic. On broth and on glycerol, a pellicle is formed. 



