1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 207 



tinuous hymenial pellicle, fragile, white, becoming pale olive- 

 buff in the herbarium, even, the margin arachnoid or byssoid ; in 

 section 75-150 \l thick, not colored, with the hyphae loosely 

 interwoven, thin-walled, not incrusted, usually 2-3 ;a in diam- 

 eter, sometimes with a few coarser and up to 6 y. in diameter 

 along the substratum, only rarely nodose-septate; no gloeo- 

 cystidia; spores hyaline, even, ellipsoidal, 4-8 X 2J/-4 (i. 



Fructifications 2-6 cm. long, 1-3 cm. wide. 



On decaying wood and leaves and fallen branches. Common 

 in Europe, infrequent from Canada to Louisiana and westward to 

 the Pacific and in the West Indies. June to February. 



C. centrifugum is related to C. arachnoideum and C. pellicular e. 

 Its more elongated spores, thinner and less arachnoid fructifica- 

 tions, and hyphae with only very few clamp connections separate 

 it from C. arachnoideum, while C. pelliculare becomes more yellow 

 in the herbarium, is likely to show some hyphal incrustation, and 

 has rather smaller spores and a more compact hymenium. Ac- 

 cording to the original description C. decipiens differs by not 

 having clamp connections but they are certainly present in the 

 authentic specimen communicated by Litschauer. 



Specimens examined : 

 Exsiccati: Ell. & Ev., Fungi Col., 309, under the name Corticium 



arachnoideum. 

 Sweden: L. Romell y 76; Stockholm, L. Romell, 60, 61, 168, 296, 



348. 

 Germany: W. Brinkmann, comm. by Bresadola. 

 Austria: Klosterberg, Tirol, V. Litschauer, and another specimen 



under the name C. decipiens, determined and comm. by 



Litschauer. 

 Canada: Ottawa, J. Macoun, 49, 52. 

 Maine: Kittery Point, R. Thaxter (in Mo. Bot. Gard. Herb., 



57606). 

 New Hampshire: Chocorua, W. G. Farlow; Shelburne, W. G. 



Farlow, 2. 

 New York: East Gal way, E. A. Burt; Ithaca Flats, C. 0. Smith, 



comm. by G. F. Atkinson, 8226; Karner, H. D. House (in 



N. Y. State Mus. Herb., and Mo. Bot. Gard. Herb., 54350). 

 New Jersey: Newfield, J. B. Ellis, in Ell. & Ev., Fungi Col., 309. 



