452 



MEDICAL MYCOLOGY 



interspecific fusions. Whether there is a relationship between these hyphal 

 fusions and the phenomenon of heterothallism, only further research will show. 

 When the conditions for growth become unfavorable, arthrospores are regu- 

 larly formed both in the lesions and in culture (Fig. 80). They are usually rows 



Pig. 81. — Pedicellate chlamydospores. 1, Megatrichophyton equinum; 2, 3, Acho7-ion 

 Schoenleini; i, Favotrichophyton ochraceum; 5, Favotrichophyton album; 6, Trichophyton 

 pHcatile; 7, Trichophyton flavum; 8, 9, Microsporum ferrugineum ; 10, 11, Trichophyton cas tu 

 Horta. (After Ota & Langeron 1923.) 



Fig-. 82. — Intercalary chlamydospores: 1, Megatrichophyton equinum; 2, Favoti-iehophytom, 

 violaceum; S, //, M. roseum var. vinosum; 5, Trichophyton tonsurans. Hyphal tips: 6, 7, 

 Achorion Schoenleini; 8, 9, Favotrichophyton album; 10, Megatrichophyton equinum. (After 

 Ota & Langeron 1923.) 



of undifferentiated hyphal cells which aid in dissemination and in carrying 

 the fungus over a period of unfavorable conditions. They have no morpho- 

 logic significance as they occur in many wholly unrelated groups of fungi. 



