Pound and Clements: north American hyphomycetes. 669 



About 25 species are reported from the United States. Some 

 of the species are stages of Chaetomium. 



29. CAMPSOTRICHUM Ehrb. Sylv. Myc. Berol. 11. 1818. 

 Vegetative hyphae and sporophores sub-decumbent, dark- 

 colored, intricately branched, the branches divaricate, hamate, 

 or fiagelliform; conidia pleurogenous, borne in clusters near 

 the tips of the branchlets, hyaline or dark- colored, simple. 



3 species are reported from the United States. 



30. GLENOSPORA B. & C. Grev. 4:161. 1876. 

 Parasitic; hyphae interwoven into a black crust; sporo- 

 phores ascending, forked or with short branches; conidia acro- 

 pleurogenous, or acrogenous on the tips of short lateral branch- 

 es, simple. 



2 species are reported from the United States. 



31. STREPTOTHRIX Corda. Prachtfl. 23. 1839. 

 Sporophores erect, dark - colored, virgate - branched, the 



branches and branchlets spirally flexuous; conidia pleurogen- 

 ous, solitary acrogenous, or borne on short filiform processes 

 at the ends of the branchlets, simple. 



4 species are reported from this country. 



32. RHINOTRICHUM Corda. Ic. Fung. 1 : 17. 1837. 

 Sporophores erect, light colored, simple or sub-simple, the 



tips denticulate; conidia borne on the denticulations, simple. 

 21 species are reported from the United States. 



33. OLPITRICHUM Atkinson. Bot. Gaz. 10:244. 1894. 

 Mycelium creeping; sporophores erect, simple or little 



branched, near the apex provided with flask-shaped, fusoid, 

 or enlarged sterigmata, each bearing a single, simple, con- 

 idium. 



Differs from Bhinotrichum in the inflated denticulations or 

 sterigmata. 



1 species only is described. 



In Physospora the denticulations are borne on swellings of 

 the sporophore. No species are reported from North Amer- 

 ica. 



34. ACREMONIUM Lk. Obs. Myc. 1:13. 1809. 



Acremoniella Sa.cc. Fung. Ital. /. 713. 1881. 

 Hyphae creeping, simple or sparingly branched; conidia 

 solitary on the ends of scattered, slender, simple, sub-erect 

 branches, simple. 



