295 



The descriptions of si)ecies have been taken to a great extent from 

 the original dt'scriptions and eonnnents appended thereto, as given in 

 ' Xortli American Tyrenomycetes" by Ellis and Everliart. In nearly all 

 cases, however, the writer has made some changes, and in some instances 

 the whole description has been rewritten to suit the specimens at hand. 

 All measurements of asci and spores are original. Where the measure 

 luents given by Ellis and Everhart differ, their figures are given in paren- 

 theses. In some cases the measurements given by Saccardo are included 

 also. 



The identitication of all species covered by this paper has been verified 

 by T>r. Charles II. Peck, State Botanist of New York, who was kind 

 enough to examine all our specimens. In a few cases the species was de- 

 termined by him. I take this opportunity to express my thanks for his 

 assistance in this work. 



I am also indebted to Prof. J. M. Van HooIj, of Indiana University, 

 for material placed at my disposal, and for aid and advice in formulating 

 this paper. 



Key to Species. 



I. Stroma large, irregular, thrown into folds or ridges, spores S microns 

 long or less 1. H. Petersii. 



II. Stroma more or less effused. 



A. Stroma broadly effused. 



1. Externally colored whitish or gray. 



a. Smooth, whitish, dotted witli black ostiola 



2. II. afroindictatnm. 



2. Externally colored not whitisli or gray. 



a. Perithecia 2/3-1 mm. long, spores 11-13 microns long 



3. H. atropnrpiircKm. 



b. Perithecia 1/2 mm. long, spores 0-11 microns long 



//.//. rul)igi)iosum. 



B. Stroma vai'iously effused or continent, usually in small areas. 

 1. Externally colored not black. 



a. Surface of stroma bright purple, ostiola not white-margined, 

 •spores 12-1:1 microns long 5. II. fuscopiirpKrcum. 



b. Surface of stroma Iirown or slightly purplish, ostiola white- 

 liiargined, spores 8-11 microns long *6. II. perfoi-atum. 



