118 THE FUNGI WHICH CAUSE PLANT DISEASE 



Hemiascomycetes (p. 117) 



There is a single order, the Protomycetales, which contains about 

 twenty-five species. MyceUum filamentous, branched, septate; 

 conidia present; asci sporangia-like, containing numerous spores, 

 terminal, naked or covered with a hyphal felt; in some species 

 known to originate from the fertiUzation of an oogonium. 



Protomycetales 



Key to Families or Protomycetales 



Asci naked 



Asci long, tubular 1- Ascoideacese. 



Asci elliptic or globular 2. Protomycetacese, p. 118. 



Asci more or less covered by hsTphae 3. Monascacese. 



Of these families the first is found in slime flux; the last is sap- 

 rophytic. 



Protomycetaceae 



Mycelium prominent; asci intercalary or terminal, large, de- 

 velopment arrested before spores are formed; a process which is 

 completed only after a period of rest. 



Key to Genera of Protomycetaces 



Parasitic, intercellular in living plants 1. Protomyces, p. 118. 



Saprophytic, building hemispheric sporing 



masses 2. Endogone. 



Protomyces Unger 



Asci thick walled; after a long period of rest forming a large 

 mass of elliptic spores which conjugate in pairs, then germinate 

 immediately by a germ tube. 



This genus is sometimes placed with the Phycomycetes.** 



