1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 185 



mosses and lichens and on rotten wood. Rare in Europe, com- 

 mon in North America from Canada to Louisiana and westward 

 to the Pacific, in the West Indies and the Hawaiian Islands. May 

 to November. 



C. arachnoideum is globose-spored and separated from C. 

 lacteum by white color, more arachnoid subiculum, and thinner 

 and less compact hymenium. C. centrifugum, which is common 

 in Europe and infrequent in North America, has narrower spores 

 than C. arachnoideum , is less arachnoid, more inclined to ashy 

 white color, more widely effused, and on decaying wood preferably. 

 Our American specimens of C. arachnoideum agree perfectly with 

 those of Berkeley in Kew and with the Berkeley & Curtis speci- 

 mens also determined by Berkeley. 



Specimens examined : 

 Exsiccati: Brinkmann, Westfalische Pilze, 103; Ellis, N. Am. 



Fungi, 411; Ell. & Ev., Fungi Col., 918. 

 Sweden: L. Romell, 77; Stockholm, L. Romell, 161. 

 England: on moss, 437, authentic specimen, perhaps type, M. J. 



Berkeley (in Kew Herb.). 

 Scotland: Glamis, /. Stevenson (in Berkeley Herb, of Kew Herb.). 

 Germany : Westphalia, W. Brinkmann, comm. by Bresadola, and 



in Brinkmann, Westfalische Pilze, 103 (in Mo. Bot. Gard. 



Herb., 63441). 

 Austria: Stubai, Tirol, V. Litschauer, under the name Corticium 



centrifugum var. macrosporum. 

 Canada: J. Macoun, 47, 63; Lower St. Lawrence Valley, J. 



Macoun, 12, 64, 89; London, Ontario, J. Dearness, 11 46 (in Mo. 



Bot. Gard. Herb., 18762); Ottawa, J. Macoun, 400. 

 Newfoundland: Bay of Islands, A. C. Waghorne, 1014 (in Mo. 



Bot. Gard. Herb., 4813). 

 Massachusetts: Sharon, A. P. D. Piguet, comm. by W. G. Farlow, 



and 135, comm. by Farlow Herb, (in Mo. Bot. Gard. Herb., 



59626). 

 Vermont: Middlebury, E. A. Burt, 4 gatherings. 

 New York: Albany, H. D. House (in N. Y. State Mus. Herb., and 



Mo. Bot. Gard. Herb., 57509); Bolton, C. H. Peck, 17; Bolton 



Landing, C. H. Peck (in N. Y. State Mus. Herb., and Mo. Bot. 



Gard. Herb., 55769); East Galway, E. A. Burt; Ithaca, G. F. 



