1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 223 
paraphyses, the location of the cystidia in the hymenial side of 
the fructification, and the velvety surface sharply separate 
wholly resupinate specimens of S. versiforme from brownish 
colored forms of Peniophora cinerea. 
Peniophora obscura (Pers.) Bresadola, according to specimen 
collected in Hungary, communicated to me by Bresadola and 
compared by him with an authentie specimen of Persoon, is 
strikingly similar to very young and wholly resupinate specimens 
of Stereum versiforme. There is no European record that P. 
obscura ever has been observed reflexed or has shown any ten- 
dency to become reflexed. In America, S. versiforme is wholly 
resupinate only when very young and soon thickens, becomes 
more or less reflexed, and in well-developed specimens such as 
that cited below, collected by Underwood at White Plains, N. Y., 
has but little in common with P. obscura. For these reasons I 
believe that the name Stereum versiforme should be applied to 
American specimens until Europeans find their Peniophora 
obscura in a reflexed stage identical in its characters with S. 
versiforme. 
Specimens examined: 
Exsiccati: Ellis, N. Am. Fungi, 606, under the name Sterewm 
papyrinum; El. & Ev., N. Am. Fungi, 3209; Ell. & Ev., 
Fungi Col., 611; de Thümen, Myc. Univ., 307. 
Canada: J. Macoun, 8 in part, 70; on peach tree, J. H. Faull 
(in Mo. Bot. Gard. Herb., 55561). 
Quebec: Hylmer, J. Macoun, 229. 
Ontario: York Mills, J. H. Faull, Univ. Toronto Herb., 322 in 
part (in Mo. Bot. Gard. Herb., 44933). 
New Hampshire: Chocorua, W. G. Farlow (in Mo. Bot. Gard. 
Herb., 55586). 
Vermont: Pub E. A. Burt. 
Massachusetts: Arlington Heights, E. A. Burt; Sharon, A. P. 
D. Piguet, comm. by W. G. Farlow (in Mo. Bot. Gard. 
Herb., 55231); Waverly, A. B. Seymour, T 15 (in Mo. 
Bot. Gard. Herb., 18098). 
New York: Alcove, C. L. Shear, 1139, 1304, 1328; East Galway, 
E. A. Burt; Grand View, H. von Schrenk (in Mo. Bot. Gard. 
Herb., 42807); Ithaca, Van Hook, comm. by G. F. Atkin- 
son, 8217; Karner, H. D. House (in N. Y. State Mus. Herb. 
