616 THE FUNGI WHICH CAUSE PLANT DISEASE 



Conidia single 

 Hyphse alike 

 Conidia cruciate-divided, verru- 



cose 10. Tetracoccosporium. 



Conidia muriform, typically 

 smooth 



Hyphae decumbent 11. Stemphylium, p. 617. 



Hyphae erect or ascending 

 Conidia globose, pleuro- 

 gynous 

 Conidia around the apex 



of the hyphse 12. Coccosporium. 



Conidia conglobate 



around the base 13. Tiichsegum. 



Conidia ovoid to oblong, 

 mostly acrogenous 

 Conidiophores somewhat 



lax, colored 14. Macrosporium, p. 618. 



Conidiophores rigid, very 



dark 15. Mystrosporium, p. 620. 



Hyphae of two kinds, longer 



sterile, shorter fertile 16. Septosporium, p. 620. 



Conidia capitate 17. Dactylosporium. 



Conidia catenulate 

 Hyphae velvety, erect, subsimple; 



conidia caudate 18. Altemaria, p. 621. 



Hyphae crustose, various; conidia 2- 

 celled; conidia-like gangUa sar- 



cinaeform 19. Fumago, p. 624. 



Conidia of two forms, dark sarcinseform 



and subhyaline falcate 20. Sarcinella, p. 625. 



Sporodesmium Link.^^^ (p. 615) 



Mycelium and conidiophores poorly developed; conidia ovoid 

 oblong, subsessile or short-stalked, rather large, clathrate-septate, 

 fuligineus. 



Over eighty species. 



S. piriforme Cda. on oranges=Pleospora hesperidearum, 

 p. 260. 



S. ezitiosum Ktihn on crucifers=Leptosphaeria napi, p. 258. 



