THE FUNGI WHICH CAUSE PLANT DISEASE 277 



globose, with a short, conical ostiole, walls 

 black, carbonous to leathery; asci cylindric, 

 8-spored; spores elliptic, continuous, brown, 

 imappendaged; paraphyses usually present. 



Over one hundred species, chiefly sapro- 

 phytes. 



A. sullae Montem. occurs as the cause of a 

 leaf spot on sulla.^** Fig. 206.— a. des- 



A. bohiensis (Hmp.) Speg. is on cacao; Z^g, I'^^ut^^S; 



A. destruens Sh. on cranberry; spores; 11, germi- 



Dating spore. After 



A. coffese Desm. on coffee.™* ^^ Shear. 



Valsaceae (p. 223) 



Stroma effused, subglobose, conic, or pulvinate, often indefinite; 

 perithecia sunken in the stroma, scattered or clustered, black, 

 leathery; asci cylindric or clavate; paraphyses usually present. 



Over one thousand species, chiefly saprophytic. Conidia are 

 present on hyphse or in pycnidia. 



Key to Genera op Valsaceae 

 Spores I-celled 

 Spores cylindric or ellipsoid, with a brown 



membrane 1- Anthostoma. 



Spores ellipsoid, curved or not, with a 



hyaline membrane 2. Valsa, p. 278. 



Spwres more than I-celled 

 Spores with cross walls only 

 Spores hyaline 

 Spores unappendaged 

 Spores ellipsoid or fusoid 2 to 4- 



celled 3. Diaporthe, p. 278. 



Spores elongate, fusoid, constricted 



in the middle 4. Vialaea. 



Spores appendaged, 1 appendage at 

 each end and 2 or 3 in the mid- 

 dle 5. Caudospora. 



Spores brown 



Spores 2-celled, eUipsoid 6. Rhynchostoma. 



Spores many-celled, fusoid 7. Ealmusia. 



