Phyllactinia. 



Uncinula. 



KEY TO THE GENERA. 



ERY3IPHEAK. 



* Appendages to the perithecia simple and similar 



to the threads of the mycelium,. 



Only one ascus in a perithecium. Sphaerotheca. 



Several asci in each perithecium. Erysiphe. 



Appendages branched at their tips 



Only one ascus in a perithecium. Podosphaera. 



Several asci in each " Microsphaera. 



*** Appendages not branched but different from 



the threads of the mycelium. 

 Appendages swollen at tho base, tips straight. 

 Appendages not swollen at the base, tips coiled. 



PERISPORIEAE. 



* Mycelium present. 

 Mycelium thin, arachnoid, 



" yellow. 

 " light colored. 

 ** Mycelium scanty or wanting. 

 Perithecia scattered, subglobose. 



flattened. 

 stromatic. 



*** Mycelium black. 

 Perithecia subglobose, appendiculate. 



not 



flattened. 



elongated, subulate etc. 

 **** Mycelium, massive, coarse. 



HYPOCREACEAE. 



A. Perithecia sunk in a stroma. 



* Stroma erect, sporidia filiform, hyaline. 

 Stroma capitate, sclerotigenous. 



clavate, entomogenous. 



herbicolous. 



**Stroma tuber cidif or m. 

 Fimicolous. sporidia elliptical. 

 Herbicolous, sporidia filiform. 

 *** Stroma effused, dark colored. 



Saccardia. 



Eurotium. 



Myriococcum, 



Perisporium. 

 Microthyrium 

 Lasiobotrys. 



Meliola 



D imerosporium 



Aster ina- 



Capnodium. 



Scorias. 



Claviceps. 



Cordyceps. 



Acrospermum. 



Selinia. 

 Oomyces. 



