1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 249 



barium, setulose with the large cystidia, the margin indeterminate, 

 thinning out; in section 75-250 y. thick, not colored, composed of 

 densely interwoven, hyaline hyphae about 3 jj. in diameter, not 

 incrusted, and of very numerous large cystidia, many of which 

 are often tilted in all directions; no gloeocystidia; cystidia heavily 

 incrusted, cylindric-fusiform to conical, sharp-pointed, 60-120 

 X 12-18 \l, numerous in all regions to the substratum, protrud- 

 ing up to 50 \k beyond the basidia; spores hyaline, even, white in a 

 spore collection, 43^-6 X 2J^-33^ \l. 



Fructifications 5-15 cm. or more long, 2-5 cm. wide. 



On bark of decaying limbs of Carya, Liguidambar, Myrica, 

 Quercus, Salix, VitiSj and other frondose species. South Carolina 

 to Louisiana, West Virginia and Ohio to Arkansas, and in the 

 West Indies. July to April. Common. 



P. flavido-alba resembles in aspect P. pubera with which it was 

 confused by v. Hohnel & Litschauer in their study of specimens 

 distributed by Ravenel and by Ellis in their exsiccati, but differs 

 sharply from P. pubera in absence of gloeocystidia and in having 

 smaller spores. Its spores are smaller than those of P. guttulifera; 

 it lacks layered structure, and the cystidia are much larger than 

 in either P. Ravenelii or P. Roumeguerii. There may be ob- 

 served in sectional preparations a curious tilting of many cys- 

 tidia, some towards the right and some towards the left while 

 most are erect and the tilting is at varying angles, being occasion- 

 ally quite parallel with the substratum. Such tilting is unique 

 among the species of Peniophora known to me and is best shown 

 by the immersed cystidia in sections from the thicker fructi- 

 fications. The type specimen in Kew Herbarium is on the same 

 substratum, Myrica, as the specimens distributed in Ravenel, 

 Fungi Am., 226, and impressed me as probably being from the 

 same gathering. 



Specimens examined: 

 Exsiccati: Bartholomew, Fungi Col., 4741; Ellis, N. Am. Fungi, 



1209; Ell. & Ev., N. Am. Fungi, 3412; Ravenel, Fungi Am., 



226. 

 South Carolina: P. H. Rolfs, 1622, 1625. 

 Georgia: Atlanta, E. Bartholomew, 5677, 5689 (in Mo. Bot. 



Gard. Herb., 44253); Darien, H. W. Ravenel, 2529, type (in 



