430 MEDICAL MYCOLOGY 



Pathogenic for animals experimentally and closely resembling Trichophy- 

 ton and other genera, when grown on the same media as the latter. 



Stromata ovoid or subspheric, 0.5-1.5 mm., often confluent; mycelium 

 hyaline, with walls Avith teeth close (Fig. 74, 7) or distant; chlamydospores 

 pluricellular, fusiform to pyriform; eonidia ovoid, hyaline, inclosed in nests 

 formed in the stroma, 5-6 x 2-3/x; asci ellipsoid, 8-spored, 5 x 4-5/a; spores ag- 

 glomerated, tawny, ellipsoid. 



Gyiimoascus setosus Eidam, Bot. Centralbl. 3: 106, 107, 1882. 



Eidamella spinosa Matruchot & Dassonville, Bull. Soc. Myc. France 17: 

 123-132, 1901; cultural characters in Bull. Soc. Cent. Med. Vet. 56: 50-71, 1902. 



Isolated from skin lesions of a dog. Matruchot & Dassonville were un- 

 able to reproduce lesion exactly, although some epilation occurred in vicinity 

 of inoculation. 



Mycelium hyaline, much branched, 1.5/x in diameter, which is constant in 

 submersed hyphae on liquid media, variable in air, 2-4 times less in places. 

 Usual sexual reproduction of Gymnoascaceae. Perithecial hyphae much 

 branched, lateral branches characteristically incurved ; asci in clusters on the 

 internal branches of perithecial mycelium, ovoid, 6-7 x 3-4;a, 8-spored, spores 

 citriform, 3 x 1.5/*, hyaline ; chlamydospores intercalary. On usual media the 

 colony is white, velvety, secreting a gooseberry-red pigment in the substrate. 

 The perithecia are black. 



Gymnoascus gypseus Nannizzi, Atti R. Accad. Fisiocrit. Siena X, 2: 

 93-95, 1927. 



Achorion gypsenm Bodin, Ann. Derm. Syphiligr. IV, 8: 585-602, 1907. 



S ah our audit es gijpseus Ota & Langeron, Ann. Parasitol 1: 326. 1924. 



Producing favus in man, dog, cat, and fowl. 



Wall of peridium loose, hyphae 4-5;w, hyaline, smooth without, up to 6-8/i,, 

 arcuate, simple, or dichotomous, or rarely with unilateral branches, finely 

 echinulate ; asci borne in racemes, 7-8/* in diameter, with 8 ascospores, smooth, 

 hyaline, 4-5 x 3/x, asci diffluent at maturity (Fig. 73, 1). 



Colonies on Pollacci's agar (glucose) at first punctiform, cottony, floccose 

 then effused, applanate, disciform, Avith lanceolate rays, white, later yellow 

 or yellowish ochraceous, with pulverulent center, pleomorphic in age, villose, 

 often slightly concentrically zoned. Sterile hyphae repent, straight, smooth, 

 hyaline, here and there with clavate cells, hyphal tips curved or subcircinate, 

 cells short, wall darker and slightly echinulate with granular content, irregu- 

 lar, often constricted in the middle, fertile hyphae erect or subdecumbent, 

 simple, rarely short branched ; aleurospores pyriform 3-5 x 2.5-3.5/(,, easily 

 deciduous, hyaline ; closterospores 6-7 septate, not constricted, 40-60 x 12-15/a, 

 finally granulose, echinulate, solitary or racemose or subverticillate, hyaline. 

 Pleomorphic hyphae 2-2.5/t, in diameter, rarely producing a few aleurospores. 



