KEY TO THE GENERA. 



ERVoIPHEAE. 



* Appendages to the perithecia simple and similar 



/Sphaerotheca. 

 Erysiphe. 



to the threads of the mycelium. 

 Only one ascus in a peiitlieciimi. 

 Several asci in each peritliecium. 

 ** Appendages bnaiched at their tips. •■' 



Only one ascus in a peritheeiuin. - Podosphaera.- 



Several asci in each " - Microsphaera. 



*** Appendages not branched hut different from 



the threads of the inycelium. 

 A[)penclages swollen at thu base, tips straight. ' Phyllactinia. 

 Appendages not swollen at the base, tips coiled. Uncinula. 



PERISPORIEAE. 



* Mycelium present. 

 Mycelium thin, arachnoid. 



" yellow. • - 



" light colored. 

 ** Mycelium scanty or wanting. 

 Perithecia scattered, subglohose. 



" ' " flattened, 



stioinatic. 

 *** Mycelium black. 

 Perithecia subglohose," appendiculate. 



'• " not " 



flattened 



" elongated, subulate etc. 

 **** Mycelium, massive, coarse. ■ 



HYPOCRKACEAE. 



Perithecia sauk in a stroma. 



* Stroma erect, sporldia filiform, hyaline. 

 .Stroma capitate, scleiotigenous. 



" clavate, entoraogenous. 



" '■ herbicoion.s. 



** Stroma tubercidiform. 

 Fimicolous, sporidia elliptical. 

 Herbicolous, sporidia filiform. 

 *** Stroma effused, dark colored. 



Saccardia. 



Eurotium. 



Myriococcum. 



Perisporium. 



Microthyrium 



Lasiohotrys. 



Meliola 



Dimer'osporiurn 



Asterina- 



Gapnodium. 



Scorias. 



Glaviceps. 



Cordyceps. 



AcrQspermum, 



Selinia. 

 Ooniyces. 



