668 MINNESOTA BOTANICAL STUDIES. 



1 species is described. 



Tribe Botryteae (Fr.) 



Botrytidei Fr. Sumin. Veg. Scand. 2: 490. 1849. 



Sporophores erect, ascending, or decumbent, not rigid, gen- 

 erally much branched; conidiapleurogenous, acropleurogenous, 

 or solitary acrogenous on short lateral branches. 



26. BOTRYTIS Pers. Tent. Disp. Meth. Fung. 40. 1797. 

 Sporophores erect, irregularly much branched, tips of the 



branchlets acute or sub-acute; conidia simple, clustered, acro- 

 pleurogenous or pleurogenous on the upper portions of the 

 branchlets. 



Saccardo includes Polyactis and Phymatotrichum in this genus. 

 But, while the latter resemble Botrytis in bearing clusters of 

 conidia at or near the tips of the branchlets, they appear more 

 closely related to Botryosporium and the Cephalosporieae. The 

 typical Botrytis forms for the most part belong to various Sphae- 

 riaceae. Some are stages of Hypoxylon, one belongs to Melan 

 ospora. Polyactis for the most part contains conidial forms of 

 Sclerotinia. Even with Polyactis and Phymatotrichum removed, 

 the group is very heterogeneous and unsatisfactory. The spe- 

 cies with pleurogenous conidia are not readily separable from 

 Haplaria and Sporotrichum. 



About 35 species are reported from the United States. 



27. HAPLARIA Lk. Obs. Myc. 1 : 9. 1809. 



Acladium Lk. Obs. Myc. 1 : 9. 1809. 

 Virgaria Nees. Syst. Pilz. 2: 14. 1816. 



Vegetative hyphae creeping; sporophores erect, branched or 

 simple, light colored or fuscous; conidia pleurogenous, simple. 



Acladium differs only in having unbranched sporophores. 

 Virgaria is composed of forms which may well be referred to 

 Haplaria — differing only in color and in the somewhat more 

 rigid sporophore — and of a few dark colored species of Botrytis. 



11 species are reported from the United States. 



28. SPOROTRICHUM Lk. Obs. Myc. 1 : 9. 1809. 



Trichosporium Fr. Summ. Veg. Scand. 2: 492. 1849. 



Vegetative hyphae and sporophores decumbent, sporophores 

 irregularly much branched or simple; conidia pleurogenous or 

 aero- pleurogenous upon the branchlets, sub-solitary, simple. 



Differs from Botrytis in the decumbent sporophores and sub- 

 solitary conidia. Saccardo separates the dark-colored forms 

 under Trichosporium. 



