534 THE FUNGI WHICH CAUSE PLANT DISEASE 



Key to Gbneea of Excipulacete-Hyalosporae 



Pycnidia pilose or setose 

 Conidia mutieate; pycnidia cupulate. ... 1. Amerosporium, p. 534. 

 Conidia ciliate; pycnidia cupulate 



Conidia several-ciliate at apex 2. Polynema. 



Conidia 1-ciliate at each end 3. Dinemasporium, p. 535. 



Pycnidia smooth or nearly so 

 Pycnidia more or less cup-shaped, or dis- 

 ciform 

 Pycnidia black 



Pycnidia composed of conglutinate 



dark hyphse 4. Godroniella. 



Pycnidia with cellular contcjct 

 Pycnidia cup-like when mature, 

 sometimes obconoid 

 Conidiophores simple 



Pycnidia cup-shaped 5. Ezcipula. 



Pycnidia terete-conic 6. Catinula. 



Conidiophores branched 7. Heteropatella. 



Pycnidia subglobose, disciform or 

 verruciform 

 Pycnidia subglobose, irregularly 



dehiscent and collabent 8. Dothichiza, p. 535. 



Pycnidia disciform, often im- 

 perfect and covered by 



epidermis 9. Discula, p. 535. 



Pycnidia verruciform; conidia 



mucose-involute 10. Agyriellopsis. 



Pycnidia purple 11. Lemalis. 



Pycnidia hysterioid or valvately gaping 



Pycnidia widely hysterioid 12. Psilospora. 



Pycnidia valvately gaping 

 Conidiophores typically branched. .. 13. Sporonema, p. 535. 

 Conidiophores simple or none 14. Pleococcum. 



Amerosporium Spegazzini 



Pj'cnidia subcupulate, setulose, conidia cylindric to ellipsoid. 

 Some twenty-five species, chiefly saprophytes. 

 A. oeconomicimi E. & T. 



