44 ROCHESTER ACADEMY OF SCIENCE. [March 24, 



In the fungus flora of Orleans county, so far as known, the Hymeno- 

 mycetes, or mushrooms and their allies, head the list with the greatest 

 number of species, viz: 96, or nearly one-fourth the number of recorded 

 species. The Pyrenomycetes come next with 86 species. The 

 Hymenomycetes, being mostly of large size, were collected rapidly at 

 first, while members of the other orders, for the most part microscopic, 

 were overlooked. Lately, however, the Pyrenomycetes are coming to 

 the front and will, doubtless, greatly outnumber the other fungi when 

 our mycologic flora has been thoroughly investigated. The list of 

 fungi found in Orleans county includes forms new to the state or, at 

 least, not enumerated in the reports of Prof. C. H. Peck, and several 

 new species and varieties which are set forth at the conclusion of this 

 article. (One of the rarer forms is Pleospora subsulcata, E and E. 

 See plate 4, fig. 1 and 2.) 



All of the families into which Prof. Saccardo divides the Pyreno- 

 mycetes are represented in the mycologic flora of Orleans county 

 except one (the Microthyriacere). Nearly forty (40) genera are found 

 in the list of black fungi, the common genera, Valsa, Hypoxylon, Eutypa, 

 Roselliuia, Diatrype and Diaporthe, having the greatest number of species 

 to their credit. The "black fungi" previously mentioned belong to 

 the saprophytes and exist on dead and decaying substances. 



We now turn to consider some species of Pyrenomycetes which are 

 parasitic on living plants, the mildews or Perisporiacese, the first 

 family of Pyrenomycetes in the Sylloge Fungorum. Since the publication 

 of Vol. I of Saccardo's Sylloge, there has been published a paper on the 

 " Mildews of Illinois," by Dr Burrill, which reduces many species of 

 the former work to synonyms. Our mildews (Orleans county) by the 

 arrangement adopted by Peck in his reports, or by Saccardo in the 

 Sylloge, are 19 in number, and by the revision of Burrill became 

 reduced to 14 species. Among the host plants in Western New 

 York attacked by mildew, we find cherry, horsechestnut, grape, lilac, 

 honeysuckle, phlox, violet, larkspur, woodbine, aster, viburnum, elder, 

 elm, beech, maple and gooseberry. The mildew on Agrimonia eupatoria 

 (which has heretofore been referred to SpJmrotheca Castagnei, Lev.) is 

 called by Burrill Spharotheca Humuli, (D. C). Lyndonville specimens of 

 a Sp/uerotheca on common agrimony show perithecia larger, appendages 

 shorter and more delicate, ascus and spores larger than the common .5". 

 Castagnei. Therefore Spharotheca Humuli (D. C), Burrill, seems an 

 appropriate name for our species (Plate 3, fig. 6). 



The Sphaeropsidese have sixty (60) representatives which are 

 distributed in many genera, the principal ones being Septoria, with 13 



