1917] 



BURT THELEPHORACEAE OF NORTH AMERICA. VIII 241 



dome-shaped tubercules; in structure 300-1000 /x thick, com- 

 posed of densely interwoven, hyaline, even-walled hyphae 47 

 H in diameter ; no cystidia ; basidia with 4 sterigmata ; spores 

 giving their color to the hymenium, even, 10-14x6-7 /x. 



Fructifications usually about 4-6 cm. in 

 diameter or elongated up to 15 cm. long, 

 5 cm. broad, sometimes larger, ^-1 mm. 

 thick. 



On logs and wood of both coniferous 

 and frondose species, but more common 

 on coniferous kinds. Quebec to District 

 of Columbia and westward to British 

 Columbia and California. Apparently 

 rare in tropical America. July to ^^^\L^^ 



February. Section of fructifica- 



Well-developed specimens of C. cere- ^^^^^^ '*'^' ^p^''^^ 

 bella are fleshy and thick and frequently 

 have the hymenial surface protrude in broad, dome-shaped 

 tubercules; young and thin fructifications are likely to be 

 confused with C. arida, which has the same color but in sec- 

 tion has its hyphae much less compactly interwoven and not 

 as coarse as in C cerehella. 



Specimens examined: 

 Exsiccati: Cavara, Fungi Longobardiae, 14; Ell. & Ev., N. 



Am. Fungi, 1588 (in copy of Mo. Bot. Gard. Herb, but not 



in copies of Farlow Herb, and of U. S. Dept. Agr. Herb.) ; 



Karsten, Fungi Fenn., 135; Krieger, Fungi Sax., 1201. 

 Sweden: Femsjo, E. Fries (in Herb. Fries, determined by 



Fries). 

 Finland: P. A. Karsten, in Karsten, Fungi Fenn., 135. 

 Austria-Hungary : definite locality not given, Strasser, comm. 



by J. Bresadola. 

 Germany : Saxony, W. Krieger, in Krieger, Fungi Sax., 1201. 

 Italy : Pavia, F. Cavara, in Cavara, Fungi Longobardiae, 14. 

 Canada : definite locality not given, J, Macoun, 11, 23, 44, 58, 



79; Lower St. Lawrence Valley, J. Macoun, 13, 

 Quebec: Hull, J. Macoun, 377; Montreal, H. von Schrenh (in 



Mo. Bot. Gard. Herb., 44053). 



