ENDOMYCETALES 133 



Abundant on the hair of young people in the state of Rio Grande do Sul, 

 Brazil. 



General microscopic appearance on hair similar to that of P. Hortai. 

 Hyphae up to Tfi in diameter. Asci more spherical, up to 30/x long, 8-spored, 

 ascospores 35-40 x 7-8fi, filiform appendages 7-8 rarely lO/x long. In cultures 

 only terminal and intercalary chlamydospores seen. 



Growth rapid on Sabouraud agar, colonies white, low margins dentate, 

 creamy then entirely black, fuliginous, easily detachable although penetrating 

 the substrate deeply. Growth slow on potato, and pigment formed very late. 

 On carrot, colony creamy white, pigment first appearing in spots, becoming 

 diffused, fuliginous, cerebriform. 



Piedraia surinamensis Dodge, n. sp. 



TricJiosporum sp. Aars, Arch. Derm. Syphilol. 22: 401-409, 1930. 



Nodosities on hair commonly up to 500/*, rarely 1 mm. long, mostly about 

 100/A in diameter exclusive of the diameter of the hair, composed of thick- 

 walled cells 4:-6fx in diameter. Asci occurring singly, 32-44 x 20/a; ascospores 

 fusiform, 42 x 6^, with two, seldom three, filiform appendages at the ends. 



On maltose agar and honey agar, dark brown to black, hard, slightly 

 velvety colonies. 



Piedraia colombiana Dodge, n. nom. 



Dematium sp. Juhel-Renoy & Lion, Ann. Derm. Syphiligr. Ill, 1 : 765-772, 

 2 pis., 1890. 



TricJiosporum giganteum Vuillemin, Arch, de Parasitol. 5: 38-66, 12 figs., 

 1902 non Unna 1895. 



Producing nodules on the hair in Colombia. 



Cells 4-5 X 5-6/x sometimes 8-12/xi long, yeastlike and proliferating when 

 young, later forming a mycelium, in old age again becoming more or less 

 yeastlike. Coils were observed in cultures, but it is not certain whether they 

 were functional antheridia and ascogonia. [Malcolm Morris (1879) had pre- 

 viously noted asci with spores, but he does not describe them in sufficient 

 detail. Peiia Chavarria & Rotter (1983) describe the ascocarps, asci, and 

 spores in some detail but fail to give measurements of the ascospores.] Brumpt 

 & Langeron (1934) studying a case from Medellin, Colombia, state that the 

 asci were 50 x 30/a, containing 8 ascospores ; spores thick-walled, 40 x 6-9/* with 

 very short filiform appendages, 4-5/t long. 



On Sabouraud agar, colonies white at first, becoming yellowish, cerebri- 

 form, not penetrating the substrate and easily separable. In old cultures the 

 cerebriform appearance is lost. On maltose agar, colonies darker and more 

 adherent. On sugar beets and carrots, growth good. Gelatin liquefaction 

 begins within 8 days. 



Piedraia venezuelensis Brumpt & Langeron, Ann. Parasitol. Hum. Comp. 

 12: 155-158, Figs. 27-32, 1934. 



Infected hairs sent by Machado of Caracas from a case of 2 years' dura- 

 tion, apparently the first case reported from this region. 



