528 THE FUNGI WHICH CAUSE PLANT DISEASE 



Z. fragaris Laib. Is said to cause a strawberry disease. 



Leptostromataces (p. 479) 



Pycnidia membranous or carbonous, black, more or less dis- 

 tinctly dimidiate, scutiform, astomous, ostiolate or cleft, erumpent 

 or superficial. Over two hundred species. 



Key to Sections of Leptostromataces. 



Conidia 1-celled 



Hyaline 1. Hyalospor«, p. 528. 



Colored 2. Phseosporse, p. 531. 



Conidia 2-celled 



Hyaline 3. Hyalodydims. 



Colored 4. Phseodidjrmse. 



Conidia 3 to several-celled 



Hyaline 5. Hyalophragmise, p. 531. 



Colored 6. Phsopharagmiae. 



Conidia 1 to several-celled, filiform 7. Scolecosporse, p. 532. 



Leptostromatacese-Hyalosporse 



Conidia hyaline, 1-celled, globose to ovoid. 



Key to Genera of Leptostromataces-Hyalosporse 



Pycnidia separate 

 Pycnidia astomous or variously perforate, 

 but not cleft 

 Conidiophores lacking 

 Pycnidia on a subicle 



Subicle of fumaginous hyphse 1. Eriothyrium. 



Subicle of broad fibers 2. Trichopeltulum. 



Pycnidia without subicle 

 Conidia muticate 

 Pycnidia stellately divided or 



cleft 3. Actinothecium. 



Pycnidia depressed-clypeate, not 



stellate 4. Leptothyrium, p. 529. 



Conidia setulose at each end 5. Tracy ella. 



Conidiophores present, cylindric 6. Piggotia, p. 530. 



