728 MINNESOTA BOTANICAL STUDIES. 



7. GRAPHIUM Corda. Icon. Fung. 1 : 18. 1837. 



Stipe erect, rigid, cylindrical, capitate, or clavate above, 

 fuscous; apices of the hyphae sporiferous, diverging; conidia 

 simple, hyaline, ovoid or ellipsoid. 



Fifteen species occur in the United States. Graphium is in- 

 termediate between Stilbum and Sp>o?'ocybe. 



8. ARTHROBOTRYUM Ces. Berk. Outl. Brit. Fung. 342. 



1860. 

 Arthrosporiam Sacc Mich. 2: 32. 1880. 

 Didymobotryum Sacc. Syll. Fung. 4: 626. 1886. 



Stipe compact, erect, rigid, capitate above, pallid or fuscous; 

 conidia oblong, 2 pluriseptate, fuscous or hyaline. 



As here limited, Arthrobotryum contains 6 species reported 

 for this country. 



Arthrobotryum compositum (Ell.) 



Arthro8poriwm compositum Ell. Bull. Torr. Bot. Club. 8: 61. 1881. 

 Arthrobotryum didymum (Cooke.) 



Stilbum didymum Cooke. Grev. 7:34. 1878. 



Didymobotryum cookei Sacc. Syll. Fung. 4: 626. 1886. 



Arthrobotryum pubescens (C. & E.) 



Graphium pubescens C.& E. Grev. 6:5. 1877. 



Didymobotryum pubescens (C & E.) Sacc. Syll. Fung. 4: 627. 1886. 



9. ISARIOPSIS Fres. Beitr. Myk. 87. 1863. 



Stilbomyces E. & E. Proc. Acad. Nat. Sci. Phil. 1895:441. 

 1895. 

 Hyphae erect, loose, cylindrical, scarcely or not at all capi- 

 tate, fuscous, or pallid; conidia oblong, linear or cylindrical, 

 fuscous or hyaline. 



Represented by 7 species in the United States. 



Tribe Coremieae. 

 Stipe and capitulum as in Stilbeae, but the sporophore typic- 

 ally verticillate- ramose, and the conidia catenulate. 



10. COREMIUM Lk. Obs. Myc. 1 : 19. 1809. 

 Stysan us Corda. Icon. Fung. 1: 21. 1837. 



Stipe erect, cylindrical, broadly capitate, or clavate above, 

 fuscous, or bright colored; conidia simple, i. e. non-septate, 

 ovoid to fusoid, fuscous, or bright colored. 



This genus has 9 representatives in this country. 



COREMIUM BERKELEYI (MONT.) 



Graphium berkeleyi Mont. PI. Cell. Nouv. 8: 303. 1838. 

 Stysanus berkeleyi (Mont.) Sacc. Syll. Fung. 4: 623. 1886. 



