1925] 



BURT — THE THELEPHORACEAE OF NORTH AMERICA. XIV 287 



sium hydrate on them, so that it can not be safely used in clearing 

 and swelling the sections. Lactic acid should be used instead. 



I have included under P. crassa the two European specimens of 

 Stereum Karstenii cited below, because of agreement in all char- 

 acters except the much greater thickness of the latter and their 

 curling away from substratum at the margin and separation of 

 the whole fructification in a sheet-like mass. American speci- 

 mens of P. crassa range from 500 to 1000 [i thick and have the 

 margin closely adnate to the substratum. Perhaps there is 

 specific difference between P. crassa and Stereum Karstenii. 



Specimens examined: 

 Exsiccati: Ellis, N. Am. Fungi, 331, under the name Corticium 

 ochroleucum var. spumeum; Ravenel, Fungi Car. 3: 33, under 

 the name Corticium ochroleucum. 

 Hungary: A. Kmet, type of Stereum Karstenii from Bresadola. 

 France: Aveyron, A. Galzin, 20064, comm. by H. Bourdot, 20799. 

 Canada: /. Macoun, 42; Quebec, J. Macoun, 260; Ottawa, /. 



Macoun, 248, in part. 

 New Hampshire: Chocorua, W. G. Farlow, 23, and an unnum- 

 bered specimen. 

 Vermont: Middlebury, E. A. Burt, two gatherings; Rip ton, E. A. 



Burt, type. 

 Massachusetts: Magnolia, W. G. Farlow, e; Sharon, A. P. D. 

 Piquet, 139, comm. by Farlow Herb, (in Mo. Bot. Gard. Herb., 

 59360). 

 New York: Floodwood, E. A. Burt, C. H. Peck, 2; Ithaca, G. F. 

 Atkinson, 8008; Keene, C. H. Peck, comm. by N. Y. State 

 Mus. Herb., T 1 (in Mo. Bot. Gard. Herb., 54554); North 

 Elba, C. H. Peck, comm. by N. Y. State Mus. Herb., T 9 (in 

 Mo. Bot. Gard. Herb., 54555) ; Sylvan Beach, Oneida County, 

 H. D. House (in N. Y. State Mus. Herb., and Mo. Bot. Gard. 

 Herb., 7460, 8293). 

 New Jersey: Newfield, J. B. Ellis, in Ellis, N. Am. Fungi, 331. 

 Pennsylvania: State College, L. 0. Overholts, 3631 (in Mo. Bot. 



Gard. Herb., 54703). 

 North Carolina: H. W. Ravenel, 1521 (in Curtis Herb., 1763, 



under the name Corticium ochroleucum var. erimosum). 

 South Carolina: H. W. Ravenel, in Ravenel, Fungi Car. 3: 33, 



