THE FUNGI WHICH CAUSE PLANT DISEASE 531 



Leptostromataceae-Phaeosporae (p. 528) 

 Conidia globose to oblong, 1-celled, dark. 



Key to Geneha of Leptostromatacese-Phseospore 



Pycnidia separate 

 Pycnidia on a dark subicle, radiately de- 

 hiscent 1. Asterostomella. 



Pycnidia not on a subicle 



Conidia conglobate, verrucose 2. Discomycopsella. 



Conidia not conglobate, smooth 3. Pirostoma, p. 531. 



Pycnidia in a stroma 

 Stroma membranous 



Pycnidia distinct, exserted 4. Peltostroma. 



Pycnidia merely locules, immersed 5. Lasmenia. 



Stroma carbonous; locules many, 



immersed 6. Poropeltis. 



Pirostoma Fries 



Pycnidia separate, shield-shaped, rounded or elongate, leathery, 

 conidia globose to ellipsoid. 

 A genus of less than five species. 

 P. fametianuin Poll, occurs on Pandanus in Italy. 



Leptostromataceae-Hyalophragmiae (p. 528) 

 Conidia oblong to fusoid, hyaline, 2 to several-septate. 



Ket to Genera of Leptostromatacese-Hyalophragmise 



Pycnidia astomous or ostiolate, not cleft 

 Conidia muticate; pycnidia with creeping 



hyphae 1. Asterothyrium. 



Conidia ciliate 

 Conidia fusoid, 1-ciliate at each end. . 2. Discosia, p. 531. 

 Conidia cruciate, each arm 1-ciliate. . 3. Entomosporium, p. 532. 

 Pycnidia rimose dehiscent 4. Cystothyrium. 



Discosia pini Heald has been reported as a parasite on pine 

 hypocotyls. 



