Pound and Clements: north American hyphomycetes. 649 



5. SEPTONEMA Corda. Ic. Fung. 1:9 1837. 

 Vegetative hyphae creeping, often obsolete; sporophores 



very short and scarcely distinct from the conidia or wanting; 

 conidia oblong, many-septate, brown, catenulate, the chains 

 simple or branched. 



As here limited contains 20 species reported from the United 

 States. Stigmina liriodendri E. & E. Proc. Acad. Phil. 1893: 

 171. 1893, goes here. 



6. SIRODESMIUM DeNot. Micromyc. It. Decas 5:16. 



1845. 



Vegetative hyphae creeping, few or none; sporophores short 

 or very short so that the chains of conidia are subsessile; con- 

 idia ovate-oblong, clathrate-septate, often echinulate, catenu- 

 late, constricted more or less at the articulations, the chains 

 simple or branched. 



8 species are reported from the United States. 



7. ALTERNARIA Nees. Syst. 2:72. 1816. 

 Sporophores fasciculate, more or less erect, simple or sub- 

 simple, short; conidia clavate flask-shaped, muriform- septate, 

 olivaceous, catenulate. The conidia are connected by narrow 

 isthmus-like contractions which are quite characteristic. 



3 species are reported from the United States. They are, 

 like the species of Macrosporium, conidial forms of Pleospora, 

 chiefly of P. herbarum. 



Fumago Pers. Myc. Eur. 1: 9. 1822, must be used instead of 

 Capnodium Mont. Ann. Sci. Nat. Bot. Ill, 1 1 : 233. 1848, for a 

 genus of Perisporiaceae. As almost all the species generally 

 included under this name are stages of various species belong- 

 ing to the other genus, and the only one reported for North 

 America which is retained by Saccardo (F. vagans) is of that 

 sort, a new name is unnecessary. 



8. ALYSIDIUM Kunze, Myk. Heft. 1 : 18. 1817. 



Oospora Wallu. Fl. Crypt. Germ. 2:182. 1833. Sacc Syl. Fung-. 

 4:11. 1886. 



Cespitose; sporophores short, simple or sparingly branched ; 

 conidia concatenate, globose or broadly elliptical, hyaline or 

 light-colored. 



Acrosporium Nees. 1816 was founded on Oidium monilioides 

 and applied to this group by Persoon in 1822. Alysidium was 

 founded for A. fulvum Kunze, Oospora fulva Sacc. & Vogl. 

 Bonorden, Handb. 35. 1851, took up Alysidium and described 



