1925] 



BURT — THE THELEPHORACEAE OF NORTH AMERICA. XIV 231 



P. asperipilata is a delicate, white, hypochnoid species covering 

 very rough decaying bark. It is noteworthy by the abundant, 

 needle-shaped, thin- walled cystidia with denticulate sides and by 

 the globose spores. 



Specimens examined : 

 Louisiana: St. Martin ville, A. B. Langlois, 44, comm. by Lloyd 



Herb., 2395, and 1225, comm. by W. G. Farlow (in Mo. Bot. 



Gard. Herb., 44067). 

 Texas: Houston, H. W. Ravenel, 265, type (in U. S. Dept. Agr. 



Herb, and Burt Herb.). 



16. P. albugo Burt, n. sp. 

 Type: in Burt Herb. 



Fructifications longitudinally effused, filmy-pruinose, adnate, 

 whitish, pale smoke-gray in the herbarium, even, the margin in- 

 determinate, pruinose; in section 25-50 \x thick, not colored, with 

 the basidia and cystidia starting directly from the substratum or 

 with only very short, erect, intervening hyphae 23/2~3 [x in diam- 

 eter, thin- walled, collapsing; no gloeocystidia ; cystidia not in- 

 crusted, 40-50 X 43^-6 ix, protruding up to 40 (x; spores white 

 in spore collections, even, 5-8 X 3-43/2 [^, borne 4 to a basidium. 



Fructifications 5-8 cm. long, 13^-3 cm. wide. 



Under side of decaying frondose wood. Louisiana. December 

 and April. 



P. albugo is a whitish, pruinose, filmy growth resembling in 

 aspect the young sterile mycelia which are sent in for determina- 

 tion in nearly all extensive series of specimens, but in this instance 

 Mr. Langlois took spore falls on glass from the specimens — a 

 highly commendable method of saving time, which is wasted 

 when sectional preparations are made of mere mycelia, and also 

 of keeping rubbish from preservation in the herbarium. P. al- 

 bugo is related to P. detritica of France but has less membra- 

 naceous fructifications and more elongated spores. 



Specimens examined: 

 Louisiana: St. Martin ville, A. B. Langlois, ba, type, and dl. 



17. P. albula Atkinson & Burt, n. sp. 

 Type: in Burt Herb. 



