EREMASCACEAE IMPERPECTAE 223 



ing from the medium, surface moist and finely mottled. On carrot, the same, 

 except slight velvet on surface of colony. No spores on Gorodkova agar. On 

 gelatin, growth slow, with liquefaction of medium. No development on several 

 other media tried. 



Geotrichum bostonense Dodge, n. sp. 



Parasaccharomyces G Nye, Zerfas & Cornwell, Amer. Jour. Med. Sci. 175 : 

 163-164, 1928. 



Isolated from stools in case of carcinoma of stomach. 



Cells ovoid, 4-5/x, in diameter, few elongate forms and many septate hyphae. 

 Cytoplasm slightly granular and contains vacuoles without refractive granules. 

 No nucleated cells. 



On agar, colonies elevated, regular, shiny, and dirty green in color. In 

 peptone water, growth at bottom of tube, with clear supernatant liquid and 

 no pellicle. In gelatin stab marked mycelial production, but no lateral out- 

 growths. Acid, without fermentation, with all sugars except sucrose and 

 lactose. Gelatin liquefied. 



MYCODERMA 



Mycoderma Persoon, Myc. Europaea 96, 1822. 



The type species is Mycoderma mesentericum Pers. 



Morphology, in general, as in Geotrichum but gelification of the walls more 

 complete, so that in old cultures spherical or ellipsoid cells are abundant; 

 cells contain abundant oil globules and grow rapidly, soon covering liquid 

 media with a thick folded pellicle with radial folds running to within about 

 2 mm. of the periphery; giant colonies sometimes yellowish, surface dull; 

 gelatin not liquefied, sugars not fermented. 



While the majority of species in this genus are saprophytic, some species 

 have been found on man, mostly confined to the respiratory and digestive 

 tract, in the latter merely isolated from stools and not known to be etiologic 

 agents of disease. A few species have been described as producing abscesses 

 in the skin, all but one so poorly described that the reference here is not cer- 

 tain. The one well-described species, Mycoderma nohile, differs from all the 

 other members of the genus in the presence of raquet mycelium and in fer- 

 menting sugars, and perhaps belongs in another genus. When its perfect 

 stage is found, quite likely it will appear to belong to Zymonema. 



Key to Species 



Sugars fermented. 



Glucose and starch fermented, colony white, raquet mycelium present. 



M, nohile. 

 Glucose, sucrose, and lactose fermented, colony becoming sulphur yellow, no raquet 

 mycelium present. M. sulfureum. 



Sugars not fermented. 

 Colony white. 



Colony zonate velvety. M. Nyahisi. 



Colony with elevated wrinkled yellowish center. M. virulens. 



