1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 323 



loosely interwoven region next to the substratum yellow, the 

 loosely interwoven hyphae thin- walled, 2-4 y. in diameter, not 

 nodose-septate, incrusted with colored granules which give the 

 color to the fructification, and are destroyed and dissolved by the 

 action of potassium hydrate solution leaving the sections bleached ; 

 no gloeocystidia; cystidia not incrusted, thin- walled, cylindric, 

 6-9 (j. in diameter, protruding 25-40 [l beyond the basidia; basidia 

 with 4 sterigmata; spores white in collection on slide, even, 

 7-8 X 4-5 pu 



Fructifications 1-2 cm. in diameter, becoming confluent over 

 areas 3-8 cm. long, 2-5 cm. wide. 



On bark and wood of decaying Vitis, Abies, Acer, and Fagus. 

 Vermont to North Carolina, Kentucky, and Arkansas. July to 

 October. Abundant locally. 



P. viticola is conspicuous by the large, brilliant orange fruc- 

 tifications with paler, pruinose fertile hymenium which occur on 

 rotting large stems of the wild grape and on logs in deep mountain 

 forests. The bleaching of the sections through destruction and 

 solution of the incrusting pigment granules is common also to 

 P. filamentosa, from which P. viticola differs in more orange color 

 and larger spores. 



Specimens examined: 

 Exsiccati: Ravenel, Fungi Car. 3: 34. 

 Vermont: Bread Loaf, E. A. Burt; Little Notch, E. A. Burt; 



Middlebury, E. A. Burt, determination as Corticium sub- 



aurantiacum confirmed by Peck. 

 New York: Ampersand, C. H. Peck (in N. Y. State Mus. Herb., 



T 20, and Mo. Bot. Gard. Herb., 54638); Clear Water, G. F. 



Atkinson, 5043 (in Cornell Univ. Herb.); Floodwood, E. A. 



Burt; Lake Placid, W. A, & E. L. Murrill, 104 (in N. Y. Bot. 



Gard. Herb., and Mo. Bot. Gard. Herb., 57344); Long Lake, 



A. H. W. Povah, 13 (in Mo. Bot. Gard. Herb., 9084); Marcy 



Trail, C. H. Peck (in N. Y. State Mus. Herb., T 19, and Mo. 



Bot. Gard. Herb., 54637); North Elba, C. H. Kaufman, 3 (in 



Mo. Bot. Gard. Herb., 6686) ; Ray Brook, C. H. Peck (in N. Y. 



State Mus. Herb., T 21, and Mo. Bot. Gard. Herb., 54639); 



Undercliff, comm. by Univ. Wis. Herb., 45. 

 North Carolina: Salem, Schweinitz, type (in Herb. Schweinitz). 



