1917] 



BURT THELEPHORACEAE OF NORTH AMERICA. VIII 255 



guished from both species by having incrusted hyphae which 

 are coarser than those of C. arida. The European C. Betulae 

 Karst., of which I have an authentic specimen, does not form 

 a compact hymenial membrane, is very thin, not at all sep- 

 arable from substratum, has the margin similar to the central 

 portion of the fructification, hyphae frequently nodose-sep- 

 tate, and cystidia always present, 6 n in diameter, emerging 

 20-30 n above the basidia — differing in all the above respects 

 from our C. suffocata. C. suhcinnamomea Karst. differs by 

 having in its hymenium noteworthy branching paraphyses 

 and small, flexuous cystidia. C. suffocata is probably very de- 

 structive as a timber rot. The cystidia when occasionally dis- 

 tinguishable are about 6 /i in diameter and emerge up to 20 

 or even 40 /x above the basidia. 



Specimens examined: 

 Exsiccati : Ellis, N. Am. Fungi, 328, under the name Hymeno- 



chaete Ellisii; Ell. & Ev., Fungi Col., 219, under the name 



Coniophora puteana. 

 Canada : Lower St. Lawrence Valley, J. Macoun, 7, 48, 55. 

 Ontario: Ottawa, J. Macoun, 416; Toronto, G. H. Graham, 



Univ. Toronto Herb., 681 (in Mo. Bot. Gard. Herb., 44939). 

 Vermont: Middlebury, E. A. Burt. 

 Massachusetts : Belmont Spring, C. Bullard, comm. by W. G. 



Farlow, 3, and an unnumbered specimen; Hammond's Pond, 



Brookline, G. R. Lyman, 176. 

 New York: Alcove, G. L. Shear, 1303; East Galway, E. A. 



Burt; Ithaca, G. F. Atkinson, 997; Karner, H. D. House, 



N. Y. State Mus. Herb., 14.165 (in Mo. Bot. Gard. Herb., 



44714) ; Sandlake, C. H. Peck, type (in Coll. N. Y. State). 

 New Jersey : Newfield, J. B. Ellis, in Ellis, N. Am. Fungi, 328, 



and in Ell. & Ev., Fungi Col., 219, and on white oak, Feb. 3, 



1877 (in Farlow Herb.). 

 Pennsylvania: State College, C. R. Orton, comm. by L. 0. 



Overholts, 2897 (in Mo. Bot. Gard. Herb., 5719). 

 District of Columbia: Rock Creek, C. L. Shear, 1350. 

 Florida: W. W. Calkins (in U. S. Dept. Agr. Herb., under the 



name Corticium epichlorum). 

 Louisiana: St. Martinville, A. B. Langlois, eg. 



