MALASSEZIA 369 



Gorodkova agar, colony similar, light ochraceous salmon, cells similar but 

 some long cells present. On lactose broth agar and nutrient agar, colony flat, 

 or slightly elevated, cinnamon buif, cells spherical, 2-5/a. On lactose broth 

 agar, colony pulvinate, light ochraceous buff, cells 4.5/^, spherical or ovoid. 

 On glycerol agar, colony light ochraceous salmon, smooth, glistening, radial 

 ridges, pulvinate. Cells spherical or ovoid, 2-7/a with long cells. On yeast 

 glucose, colonies similar, cells spherical, 2-5/*, sometimes clinging together in 

 short chains of 3 cells with few long cells. On serum agar, growth poor, 

 colony dull and pasty, ochraceous buff. On blood agar, colony glistening or 

 waxy, pinkish buff, appearance of that on malt extract agar. On peptone 

 broth, no pellicle or ring, sediment shows cells spherical to ovoid, 3-9/* mostly 

 5fi in diameter, forming chains 3-5 x 12-15/i with many thick-walled cells. On 

 lactose broth, similar, but spherical cells up to 12/x. in diameter with long cells 

 suggesting catenulate conidia, ovoid cells about 6/t in long axis, larger cells 

 thick-walled (Fig. 70). 



Therapeusis. — As with other fungus infections, there is no simple treat- 

 ment and the standard texts should be consulted. Since the dandruff scales 

 of the scalp form a reservoir of both Malassezia ovalis and staphylococcus, any 

 treatment should be aimed at their complete removal to prevent reinfection. 

 When this has been accomplished, the mouths of the sebaceous glands may be 

 softened by an appropriate lotion and the comedones expressed. Staphylo- 

 coccus infections may be cleared up by vaccines, although vaccines alone with- 

 out an attempt to get rid of the dandruff scales as a reservoir of reinfection are 

 of very uncertain value. 



Malassezia Macfadyemi Castellani, 1908. 



Microsporon Macfadyeni Castellani, Brit. Med. Jour. 1905, 2: 1272, 1 fig., 

 1905; Trans. Internat. Derm. Congr. 6: 661, 1908; Jour. Trop. Med. Hyg. 10: 

 65-66, 1907. 



Trichophyton Macfadyeni Castellani, Jour. Cut. Dis. 26: 396-397, 1908. 



Trichophyton Macfadyeni Castellani, Jour. Trop. Med. Hyg. 11: 261, 1908. 



Atrichophyton Macfadyeni Castellani & Chalmers, Man. Trop. Med. ed. 3, 

 1009, 1919. 



Found present in cases of pityriasis alba. 



Hyphae slender, short threads of regular outline; spores small 3-3.5/x in 

 diameter, ovoid, sometimes appearing in large clusters. 



Cultivated twice for short period on Sabouraud maltose agar, gave colo- 

 nies of very slow growth, deeply pitted yellowish mass, very firmly and 

 deeply rooted in medium. Transfers always failed. 



Malassezia tropica (Castellani) Schmitter, Jour. Trop. Med. Hyg. 26: 194, 

 1923. 



Microsponmi tropicum Castellani, Brit. Med. Jour. 1905, 2: 1271-1272, 1905; 

 Trans. Internat. Derm. Congr. 6: 661, PL 44, 1908; Jour. Trop. Med. Hyg. 10: 

 65-66, 1907; Jour. Cut. Dis. 26: 396, 1908. 



Appears in tinea flava or pityriasis flava. Not cultivated by Castellani. 



