1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 245 



On very rotten, decorticated and probably frondose wood. 

 Alabama. June to October. Only 2 gatherings known. 



P. fusca is a thin species of mucedinous aspect, like P. longi- 

 spora but well characterized by its drab color, large cystidia, and 

 moderately large spores. P. cinerea is sometimes of the same 

 color but is less mould-like when viewed with a lens and with 

 quite different structure and microscopic characters. 



Specimens examined: 

 Alabama : Montgomery County, R. P. Burke, 508, type, and 886 



(in Mo. Bot. Gard. Herb., 57301 and 63125 respectively). 



30. P. gilvidula Bresadola, Mycologia 17: 70. 1925. 

 Type: in Weir Herb. 



Fructifications broadly effused, closely adnate, waxy, pinkish 

 buff in the herbarium, here and there somewhat cracked, pruinose, 

 the margin thinning out; in section 150-250 [i thick, not colored, 

 2-layered, the layer next the substratum 75-150 \l thick, com- 

 posed of densely arranged hyphae about 4-5 \l in diameter, not 

 incrusted, which are longitudinally interwoven in the type, 

 hymenial layer 75-100 y. thick, composed of densely arranged, 

 erect, coarse tissue; no gloeocystidia; cystidia not incrusted, 

 6-8 [l in diameter, protruding 30-60 [l beyond the basidia, not 

 numerous, confined to the hymenium; basidia with 4 sterigmata; 

 spores white in the mass, even, 5-6 X 23^-33^ ti, copious. 



Fructifications 8-15 cm. long, 3-5 cm. wide. 



On wood of log of Pinus ponder osa. Montana. September. 



P. gilvidula has no especially distinctive character. The oc- 

 currence on Pinus ponderosa wood, buff color, thick hymenial 

 layer, coarse hyphae, and small spores constitute the group of 

 distinguishing characters. I have included under P. gilvidula a 

 specimen from the same place which has the layer next to the 

 substratum composed of erect hyphae. 



Specimens examined: 

 Montana: Evaro, /. R. Weir, 23305, type (in Weir Herb.) and 



426 (in Mo. Bot. Gard. Herb.). 



31. P. zonata Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



