204 OASTELLANI. 



so-called eczematoid type of tinea cruris. In one patient the eruption 

 was localized to the groins, scrotum and thighs; in the other, besides the 

 scrotum and thighs the armpits and portions of the chest and abdomen 

 were affected. I may here remark that tinea cruris is not always 

 localized in the groins or the armpits. The affection generally begins 

 in these regions, but in many eases it may spread to any other part of 

 the body except the scalp; indeed I have seen a few cases in which the 

 disease started on the chest, arms, or face, and then spread to the groin 

 and armpits. 



DESCRIPTION OF THE FUNGUS. 



In preparations from the affected parts in potassium hydroxide mycelial tubes 

 and free spores are observed, identical to those seen in E. cruris and E. perneti, 

 and similar to those of any Trychophyton of the megalosporon type. The spores 

 are large, globular, 4 to 6 fi in diameter, with a double contour. The mycelial 

 tubes, 2 to 3.5 ij., are straight, bent, or variously shaped. 



CULTURES. 



Sabouraud agar. — The growth begins to appear four to six days after inocula- 

 tion as a raised, red spot which gradually enlarges. The full-grown colonies are 

 of a deep red color, either with a central knob or crater form, and are partly 

 covered, especially the central knob, by a white down. In old cultures this may 

 cover the entire growth and may hide the red pigmentation almost completely. 

 The pigmentation even as far as the nineteenth subculture has not been lost. 



Glucose agar. — The cultures are of a very deep blood-red color, and portions of 

 the medium take the same tint. In old cultures a large amount of white down 

 is present over the entire surface of the growth, but scraping this out, the red 

 pigmentation is then extremely well marked. The red pigmentation at the time 

 of writing is still characteristic in the nineteenth transplanted subculture. 



Manniie. — Colonies deep red, covered with white, down and with central knob. 

 After a time the whole surface of the growth shows abundant, whitish fluff. 



Maltose. — In 2 per cent maltose agar, alkaline or acid, the colonies are whitish; 

 in 4 per cent maltose agar they may occasionally be red. 



Ordinary agar. — The fungus grows well, white colonies- with a central knob 

 being formed; later on these show a peripheral greenish ring, encircled by a thin 

 whitish or whitish-green zone. 



Saccharose agar. — A central white knob and later a yellowish ring are green, 

 finally a whitish zone forms at the periphery. 



Glycerine agar. — White growth with central white knob and white powdery 

 surface. 



The principal cultural characteristics already described and those presented in 

 other media are collected in the following table. 



