GEXERA OF FUXGI 



b. Cornelia single or in chains on conidiophores 

 (i) Typically parasitic on insects; zygosporous 

 (2) Typically parasitic on leaves and stems ; 

 oosporous 

 2. Typically aquatic fungi propagating by zoogonids 



a. Mycelium mostly well-developed 



(1) Antheridial tube touching or penetrating 



oogone 



(2) Antherids producing antherozoids 



b. Mycelium more or less scanty, developing wholly 



or chiefly into sporangia and sex-organs 



Ascomycetes 



I. Asci completely or partly enclosed in a pericarp 

 1. Asci in a perithecium 



a. Perithecia one to many on a receptacle ; sex- 



organs present ; typically on insects 



b. Perithecia not on a receptacle ; sex organs very 



rare ; rarely on insects 



(1) Mycelium or subicle typically present; osti- 



ole and paraphyses usually absent 

 Subicle white ; perithecia usually with ap- 

 pendages ; asci one to few, more or less 

 ovoid 

 Subicle dark or black ; appendages mostly 

 lacking ; asci usually numerous, more or 

 less cylindric 

 Perithecia more or less globose 

 Perithecia clavate to cylindric, often 

 branched 



(2) Subicle usually absent ; ostiole and paraphy- 

 ses typically present 



Perithecia fleshy or waxy, bright colored 

 Perithecia hard, membranous to carbon- 



ous, typically brown to black 

 Perithecia distinct, not reduced to cavities 

 or locules 

 (x) Perithecia normally globose, single, 

 clustered or in a stroma 

 Mycelium not forming a thallus with 



algae 

 Mycelium forming a thallus 

 Perithecia flattened, dimidiate and 



radiate 

 Perithecia with a broad and com- 

 pressed or a funnelform ostiole 

 Ostiole broad and compressed, cleft ; 



perithecia mostly carbonous 

 Ostiole elongate, then expanded and 



(a) 



(b) 



x. 



(a) 

 (b) 



m. 



n. 



(y) 



(z) 



m. 



Entomophthoraceae 

 Peronosporaceae 



Saprolegniaceae 

 Monoblepharidaceae 



Ancylistaceae 



Laboulbeniales 



Sphaeriales 



Erysibaceae 



Perisporiaceae 

 Capnodiaceae 



Hypocreaceae 



Sphaeriaceae 

 Verrucariaceae 



Microthyriaceae 



Lophiostomataceae 



14 



17 



15 



18 



16 



18 



21 



21 



22 



25 



42 



5i 



53 



