1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 201 



Wholly resupinate specimens \-2 cm. in diameter, becoming 

 laterally confluent over areas up to 15X2 cm.; reflexed portions 

 1-5 mm. broad up to 2 cm. broad in European specimens. 



On dead Tsuga, Pseudotsuga, Abies, Picea, Larix, Thuja, 

 and Cupressus. Canada to New Jersey, in Wisconsin, in Idaho 

 to British Columbia and Washington, and in New Mexico at 

 altitude 7500 ft. Occurs also in Europe. Probably throughout 

 the year but most collections dated July to October. Infrequent. 

 S. Chailletii occurs just often enough reflexed so that an 

 observant collector will soon locate his gatherings correctly in 

 Stereum. It is noteworthy by its colored cystidia of the same 

 type as those of S. umbrinum but of only half the diameter 

 of those of the latter, and by its occurrence on conifers of the 

 species named above, and by restriction in geographic range to 

 the northern United States and southern Canada and the Rocky 

 Mountain plateau. The avellaneous, somewhat velvety hymen- 

 ium is so uniform in appearance that when once learned this 

 species may usually be recognized thereafter at sight. 



Specimens examined: 

 Exsiccati: Ell. & Ev., N. Am. Fungi, 2904, under the name Hy- 



menochaete simulans Ell. & Ev., n. sp., but description does 



not seem to have been published; Krieger, Fungi Sax., 1202. 

 Norway: Christiania, M. N. Blytt, determined by E. Fries (in 



Herb. Fries). 

 Finland: Merimason, P. A.Karsten, authentic specimen of Tri- 



chocarpus ambiguus. 

 Sweden: Stockholm, L. Romell, 24, 25, 341, all under the name 



Stereum abietinum. 

 France: Arnac, Aveyron, A. Galzin, unnumbered spec, and 17948, 



comm. by H. Bourdot, 7926, and unnumbered respectively. 

 Switzerland: Sachs, W. Krieger, in Krieger, Fungi Sax., 1202. 

 Italy? or perhaps Hungary? : locality not given, G. Bresadola. 

 Canada: Cow's Swamp, J. Macoun, 115; Dow's Swamp, J. 



Macoun, 249 in part. 

 Ontario: Ottawa, J. Macoun, 57. 

 Vermont: Ripton, E. A. Burt, two collections. 

 New York: Beaver River, Adirondack Mts., G. F. Atkinson, 



Bot. Dept. of Cornell Univ., 4607; Ithaca, G. F. Atkinson, 



14189; Syracuse, G. F. Atkinson, 677, part of type of 



Peniophora Atkinsonii. 



