666 



MEDICAL MYCOLOGY 



specialized conidiophore. The various spores of Vuillemiu undoubtedly rep- 

 resent different structures, although his distinctions are somewhat difficult 

 to apply. Groups built up on such characters have much more unity than 

 those based on the lumping of the older Saccardian system. Unfortunately 

 Vuillemin was not primarily a systematist, and there has been no systematist 

 among his followers, so that he failed to give us a carefully worked out clas- 

 sification. In his last publications he was very reactionary and tried to undo 

 the good work he proposed earlier. 



In this book I have already considered the genera with blastospores, 

 arthrospores, and light colored mycelium in connection with various families 

 of the Endomycetales and Plectascales (Gymnoascaceae) ; all of the conidial 

 genera with spores borne in chains from phialides in the Plectascales (Asper- 

 gillaceae). This leaves the genera with blastospores and arthrospores having 

 black mycelium (the Toruleae) and those not bearing conidia in chains from 



Fig. 105. — Alternaria sp. (After Hopkins, Benham & Kesten 1930.) 



phialides to be treated here. In the following key I have attempted to include 

 all groups in which no ascospores (perfect stage) are known, with page refer- 

 ences to where each group is discussed further. It is felt that, in general, each 

 of these groups is relatively uniform. The tabulation is somewhat arbitrary, 

 but an attempt has been made to arrange the remaining groups in the order 

 of increasing complexity of conidiophore, following tradition in placing groups 

 with multicellular spores at the end of the series. 



Key to Larger Grroups of Fungi Imperfecti — Hyphomycetes 



No differentiation of sporophores, multiplication by sprouting or arthrospores (oidia). 



Cells mostly isodiametric or nearly so, occasionally adhering in chains, but never forming 



a true filamentous mycelium. Saccharomycetaceae Imperfect ae (p. 325). 



Cells mostly much longer in one diameter, forming a definite mycelium on most media. 

 Colonies not brown or black, producing arthrospores, often multiplying by sprouting. 



Eremascaceae Imperfectae (p. 186). 



