340 An Introduction to Medical Mycology 



fuseaux and microconidia similar to those of M. lanosum. 



4. MICROSPORUM SIMIAE 



This fungus (a parasite of monkevs) was isolated by us in a single in- 

 stance from the scalp of a child with tinea capitis. There was a history of 

 contact with a monkey. The diseased hair fluoresced like hair infected by 

 other Microspora, and the microscopic appearance also was similar. On 

 culture the growth was fluffy and white and development was slower than 

 that of M. lanosum. Radial grooves were present. The culture mount showed 



5. TRICHOPHYTON ACUMINATUM (ENDOTHRIX) 



The growth is similar to that of T. crateriforme, the only difference, in 

 some instances, being the direction of development. Trichophyton acu- 

 minatum grows upward. The surface is usually powdery; the color varies 

 from cream to brown; the center is sharply elevated, and radial striations 

 are common. 



6. TRICHOPHYTON CEREBRIFORME (ENDOTHRIX) 



The clinical appearance of infected lesions, the features revealed by di- 

 rect examination and the culture mount are similar to those of T. crateri- 

 forme. The central break which forms a depression in the cultural growth, 

 so typical of T. crateriforme, is not present. 



7. TRICHOPHYTON ROSACEUM (ENDOTHRIX) 



It has been suggested that this may be a highly tinted strain of T. pur- 

 pureum. It is described, however, as an endothrix. It has been isolated from 

 the beard, nails and glabrous skin. The cultural growth is downy, there is 

 a central umbo, and radial grooves are usually present. The pale rose color 

 gradually suffuses through the colony. The culture medium becomes 

 "gooseberry-violet." Emmons has drawn attention to the confusion which 

 may occur owing to its similarity to a saprophytic Fusarium. 



8. ACTINOMYCES TENUIS 



This is the reputed cause of lepothrix. Delicate, nonseptate hyphae may 

 be demonstrated in potash mounts. The cultural growth is sparse, wet and 

 pasty. 



