532 MEDICAL MYCOLOGY 



Aleurospores both lateral and in thyrses. Hyphal tips often clavate. 

 Aleurospores often sessile and showing transitional forms to small chlamydo- 

 spores (c3''tology not reported in these eases). 



White, velvety crateriform colony, becoming powdery with a small round 

 button in the middle, central portion becoming yellowish (Avholly yellow at 

 37° C). On Sabouraud conservation agar, colony becomes contorted, less 

 crateriform, wholly white, sometimes cracking about the edge of the crater. 

 In age it is surrounded by immersed rays, although aerial growth is largely 

 confined to the crater. Pleomorphic form rare, but occurs occasionally, pure 

 white, somewhat crateriform, but edges less steep, with deep narrow radial 

 furrows. On coagulated serum, colonies slightly umbilicate, moist, glabrous. 



Var. efFractuin (Sabouraud) Dodge, n. comb. 



TricJwphyton effractum Sabouraud, Maladies du cuir chevelu 3 : 314, 1910. 



Aleurosporia effracta Grigorakis, Ann. Sci. Nat. Bot. X, 7: 413, 1925. 



Trichophyton (Aleurosporia) effractum Guiart & Grigorakis, Lyon Med. 

 141: 377, 1928. 



Trichophyton sp. Sabouraud, Trichophyties Hum. Atlas 91, Fig. 51, 1893. 



Lesions similar to those caused by T. tonsurans. Kare. 



General form of culture close to T. tonsurans but smaller, some cracking 

 deeply on the edge of the crater, marginal zone folded deeply with immersed 

 fringe. These characters have remained constant for many years in culture. 



Var. exsiccatmn (Uriburu) Dodge, n. comb. 



Trichophyton exsiccatum Uriburu apud Sabouraud, Maladies du cuir 

 chevelu 3: 318-320, 1910. 



Producing tinea capitis infantum, endothrix type, clinical history un- 

 known. From Buenos Aires, Argentina, from Milan, Italy, and from Hungary. 

 Inoculation of guinea pig is positive and gives results similar to those of T. 

 tonsurans. 



Growth slow and difficult on test media, type of T. tonsurans. Crater 

 irregular, crackled, on aging, surrounded by a broad white border with many 

 radial fun-ows. 



Trichophyton polyg-onum Uriburu apud Sabouraud, Maladies du cuir 

 chevelu 3: 318-320, 1910. 



Clinical details lacking, cultures sent by Uriburu in 1909 from Argentina. 



Colony crateriform at first, soon becoming polygonal and finally quadri- 

 lateral. Surface of thick round folds, white, velvety at first becoming powdery. 



Trichophyton regxilare Sabouraud apud Dalla Favera, Ann. Derm. Syphi- 

 ligr. IV, 10: 438, 439, 1909; Sabouraud, Maladies du cuir chevelu 3: 316, 317, 

 1910. 



Twice it produced tinea tonsurans, once involving beard ; inoculable into 

 guinea pig, common in Holland, Austria, Tomsk in Siberia ; rare in Parma 

 from which it was first described. 



Microscopically similar to T. acuminatum (fide Bruhns & Alexander 1928). 



