Pound and Clements: north American hyphomycetes. 655 



23. SCOLECOTRICHUM Kunze&Schm. Myk. Heft. 1 : 10. 



1817. 



Sporophores short, simple, subfasciculate, olivaceous or fuli- 

 ginous, nodulose; conidia oblong or ovate, pleurogenous and 

 acrogenous, olivaceous or green, one-septate. 



Resembles Ramularia in the sporophores and shape of the 

 conidia, but is well distinguished by the color. Differs from 

 Passalora in the pleurogenous conidia. 



3 species are reported from the United States. 



24. PASSALORA Fries. Summ. Veg. Scand. 500. 1849. 



Fusicladium Bon. Handb. Alg. Myk. 80. 1851. 



Sporophores simple, subfasciculate, variable in length; co- 

 nidia acrogenous, oblong, ovoid, subfusoid or subclavate, oli- 

 vaceous or fuliginous, one-septate. 



While in typical forms Passalora and Fusicladium may be dis- 

 tinguished by the long, filiform, septate sporophores of the 

 former, and the short, straight, continuous sporophores of the 

 latter, a large number of forms, ascribed to Fusicladium, with 

 long, septate sporophores render it difficult and useless to main- 

 tain the distinction. 



About 12 species are reported from the United States, includ- 

 ing Fusicladium. 



Polythrincium Kze. & Schm. Myk. Heft. 1:13. 1817, has 

 only one species, the conidial stage of Phyllachora trifolii. The 

 sporophores are black, fasciculate, short and thick, and regu- 

 larly flexuose or torulose, and the conidia are acrogenous and 

 one-septate. 



25. NAPICLADIUM Thuem. Hedw. 14:3. 1875. 

 Sporophores fasciculate, short but not rigid, olivaceous or 



brown; conidia acrogenous, rather large, oblong, many-septate, 

 dark colored or hyaline. 



Differs from Passalora in having many- septate conidia. 2 

 species are reported from the United States. 



26. PIR1CULARIA Sacc. Mich. 2:20. 1880. 

 Sporophores erect, simple or sub simple, rather long, gray- 

 ish or hyaline; conidia acrogenous, obclavate pyriform, 2— 

 many- septate. 



Our common species and the one other described from this 

 country seem to be connected with Phyllachora graminis. 



Tribe Heliuiiithosporieae (Corda). 



Helmintltosporiacei Corda. Anleit. 1839. 



