TRICHOPHYTONEAE 487 



Closterospores present but not abundant, beginnings of nodular organs 

 on Sabonraud conservation medium, but less highly developed, usually in- 

 volving only one or tAvo closterospores. 



Growth best on conservation media, rose lilac, wine color, surface of loose 

 felt, closely suggesting- the skin of a peach. Colony at first round, becoming 

 polygonal, or star-shaped, divided by radial furrows. On peptone media, 5 

 cm. in diameter, margins fimbriate, surface marked by concentric zones of a 

 deeper color. On sugar media, colonies more round, powdery, rose color, 

 scarcely 4 cm. before pleomorphic velvet develops. Pleomorphic colonies of 

 white Velvet, with alternate elevated and depressed concentric zones. 



This species was considered of doubtful position when originally de- 

 scribed. The type of lesion is much closer to that of the species of Epidermo- 

 phyton. It has not been found in the hair and rarely in the hair follicle. In 

 pus formation it is intermediate between E. salmoneum and E. ruhidum. In its 

 cultural and moi*phologic characters, it is very close to the latter. Only a care- 

 ful comparison of the two organisms can determine whether they are identical. 



Under the name T. pedis var. /?. Ota described an organism, found in 

 about half the cases of tinea interdigitalis (Hongkong foot) investigated by 

 Kurotchkin & Chen (1930), which might belong here. At first colony of long 

 white velvet which after two months became much shorter, with a deep red 

 undergrowth, giving successively a pinkish, reddish purple, and deep purple 

 color. Aleurospores in simple or compound thyrses. Colony 4-5 cm. in 20 days, 

 round, flat, sometimes with superficial radial furrows. 



Epidermophyton rubrum Castellani, Brit. Jour. Derm. Syphilis 22 : 147-151, 

 1 pi., 1910; Philippine Jour. Sci. B 5: 203-206, 1 pi., 1910; Castellani & Chal- 

 mers, Man. Trop. Med. ed. 1, 610, 1910. 



Sabouraudites ruber Ota & Langeron, Ann. Parasitol. Hum. Comp. 1: 328, 

 1923. 



Trichophyton ruhrum Senion, Brit. Jour. Derm. Syphilis 34: 398, 1922. 



Originally described from eczematoid tinea cruris in Ceylon. Spaar re- 

 ports a case of pruritic eruption on the buttocks. Silva reports successful 

 inoculation and recovery of the organism from a case of dhobie itch (eczema 

 marginatum) while Ashford, McKinley & Dowling (1930) report that it was 

 not inoculable into Silenus rhesus (perhaps these authors were working with 

 E. purpureum) . 



In scales, arthrospores 4-5/i,, spherical, mycelium 2-3. 5/i,; morphology in 

 culture unknown. 



On glucose agar, growth in 5 days as white knob, slowly spreading, red pig- 

 ment develops gradually. On maltose agar (2%), colony whitish, powdery, 

 with a central umbilicus, sometimes red on 4% maltose. Glycerol agar, thick 

 central growth with thin outer zone, margin greenish. On Sabouraud broth, 

 colony forms a white pellicle which slowly becomes red ; on peptone Avater, a 

 white pellicle without pigment. On sucrose agar, a white knob, a yellowish 

 zone and white margin. [Spaar reports on Sabouraud maltose agar, growth 

 in 3-6 days, colony reddish becoming darker, crateriform or with central 



