1915] 



OVERHOLTS STUDIES IN THE POLYPORACEAE 721 



2. Fomes ohiensis Berk, ex Murrill. 



Pileus convex to ungulate, sometimes attached by the vertex 

 and circular in outline, 0.5-2.5 X 0.5-3 X 0.2-1 cm., pure 

 white, then black at the base, the margin remaining white, 

 often zonate or sulcate; context corky or woody, 1-3 mm. 

 thick; tubes 1-4 mm. long, the mouths white, averaging 3-5 

 per mm., thick-walled; spores 1 ovoid with a truncate base, 

 10-12 X 6-7 n ; cystidia none ; hyphae hyaline, unbranched, 

 3-4 /x ; basidia 8-11 /x broad. 



On dead wood and on structural timbers. 



Specimens examined: Ell. N. Am. Fung. 923 (as Trametes) 

 (Ohio). — Burt Herb, (collection from South America, ex Herb. 

 Romell).— Overholts Herb. 38, 39, 131, and others (Ohio), 479 

 (Missouri), 503 (Illinois). Also reported from Kansas, Michi- 

 gan, and New York. 



Trametes Pini Thor. ex Fries, T. Abietis Karst., and T. 



piceinus Peck. 



Trametes Pini dates from the year 1803, when it was de- 

 scribed by Thore, 2 and again in the following year, 1804, by 

 Broteri. 3 The typical form of the perennial plant is rather 

 large, has a more or less ungulate pileus, and in age becomes 

 blackish and rimose. At times, however, the first year's 

 growth is thin and applanate and thus differs markedly in 

 form from the typical plant. This condition was observed by 

 Peck and the name Polyporus (later changed to Trametes) 

 piceinus was proposed by him for the form that he collected 

 on Picea about 1889. 4 Karsten had already 5 described the 

 same plant in Europe, in 1882, as Fomes Abietis, and the two 

 names have been used interchangeably in this country for 

 several years. In 1889 Karsten 6 referred to his species as 



1 According to Murrill (N. Am. Flora 9: p. 96. 1908) the spores of the size 

 and form given here are conidial, but they represent the only type of spore I 

 have been able to find in the hymenium of this species. 



2 Chlor. Land. p. 487. 1803. 



•Fl. Lusit 2: p. 468. 1804. 



4 Rept. N. Y. State Mus. 42: p. 121. 1889. 



B Bidrag Finl. Nat. Folk. 37: p. 242. 1882. 



8 Finl. Uasidav, p. 336. 1889. 



