1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 297 



hyaline hyphae about 3 \l in diameter, of irregular outline; hy- 

 menial layer composed of densely arranged, erect hyphae, gloeo- 

 cystidia, and cystidia; gloeocystidia flexuous, 45-100 X 4-7 \l; 

 cystidia incrusted when wholly immersed, cylindric, obtuse, 

 30-45 X 6-8 [x, protruding 20-30 [l beyond the basidia in in- 

 crusted, or more usually, non-incrusted form, not abundant; 

 spores hyaline, even, curved, 8-12 X 23^-3 (x, with pointed and 

 tapering base, copious. 



Fructifications 2-10 cm. long but broken off at one end, 1-2}^ 

 cm. wide. 



On decaying limbs of Fagus. Kentucky. September. Prob- 

 ably local. 



Among our few species of Peniophora which have gloeocystidia, 

 P. Kauffmanii should be readily recognized by its occurrence on 

 beech, buff color, structure of 2 equal layers, and small, incrusted 

 cystidia. 



Specimens examined: 

 Kentucky : Harlan, C. H. Kauffman, 69, type (in Mo. Bot. Gard. 



Herb., 22827). 



73. P. alba Burt, n. sp. 



Type: in Burt Herb. 



Fructifications effused, very thin, somewhat membranaceous, 

 small pieces separable when moistened, white, even, not shining, 

 somewhat cracked by contraction in drying, the margin thinning 

 out; in section 80-100 y. thick, not colored, with the hyphae 

 loosely arranged near the substratum, suberect, branching, about 

 3 pi in diameter, not incrusted, only rarely nodose-septate; gloeo- 

 cystidia curved, 30-45 X QA-^Vi ji, usually starting from the 

 substratum; cystidia not incrusted or with some incrusting 

 granules, thin-walled, 4-5 \l in diameter, protruding up to 30 [i 

 beyond the basidia; spores hyaline, even, 4-5 X 2J^ \l. 



Fructifications fragmentary and not showing ends nor more 

 than one side; such fragments 5 cm. long, 10-15 mm. wide. 



On bark of dead cedar or spruce. Canada. September. 



P. alba seems possible of recognition among our many whitish 

 species of Peniophora by its pure white color, presence of gloeo- 

 cystidia in addition to cystidia, and occurrence on coniferous bark. 



