1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 231 



100-150 [l thick, not colored or only very slightly in the sub- 

 hymenium, with the hyphae longitudinally and densely inter- 

 woven next to the substratum, then becoming erect, bushy- 

 branched in the hymenial layer, short-celled, of irregular outline, 

 about 3-33/2 V> i n diameter, not incrusted but with some imbedded 

 crystalline matter; paraphyses slightly brownish below, pro- 

 truding beyond the basidia as very slender hairs about J/-l pt in 

 diameter with short lateral branches; no gloeocystidia; the only 

 spore found is hyaline, even, 9 X Q/2 v. but may not belong. 



Fructifications 2-10 cm. long, 1-2 cm. wide. 



On fallen twigs of Quercus coccinea. New Jersey to Louisiana. 

 November to April. Not common. 



P. rubrocanum is distinguished by its occurrence in thin, 

 hoary, nearly white fructifications with a tint of pink on small 

 fallen branches of oak, and by the absence of gloeocystidia and the 

 presence of delicate hair-like paraphyses in the hymenial surface. 

 Spore collections should be made to determine the spore dimen- 

 sions, for the spores have not been retained well in any specimen 

 examined. It is probable that C. rubrocanum will be found to 

 be a synonym of C. rubropallens when the type of the latter can 

 be studied more critically than by me twenty-six years ago. 



Specimens examined : 

 Exsiccati: Ellis, N. Am. Fungi, 22; de Thumen, Myc. Univ., 



409, type. 

 New Jersey: Newfield, /. B. Ellis, in Ellis, N. Am. Fungi, 22, in 



de Thumen, Myc. Univ., 409, and (in Mo. Bot. Gard. Herb., 



4846, 44638). 

 South Carolina: H. W. Ravenel, 377, comm. under the name C. 



Auberianum by N. Y. Bot. Gard. Herb. 

 Alabama: Montgomery, R. P. Burke, 105 (in Mo. Bot. Gard. 



Herb., 11280). 

 Louisiana: Natchitoches, G. D. Harris, comm. by Cornell Univ. 



Herb., 5111; St. Martinville, A. B. Langlois, 1933 



41. C. cultum Burt, n. sp. 

 Type: in Burt Herb. 



Fructifications usually a thin, whitish, cottony mycelium along 

 the sides of tunnels of a bark beetle but sometimes bearing a 



