[Vol. 12 

 262 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



incrusted cystidia when thickened; protruding cystidia cylindric 

 or tapering towards the apex, 5-10 [i in diameter at the base, 

 jirotruding up to 60 [x beyond the basidia; immersed cystidia 

 40-60 X 9-10 \i; no gloeocystidia; spores white in a spore col- 

 lection, even, 5-8 X 23/^-3^ l^^- 



Fructifications 4-15 cm. long, 2-4 cm. wide. 



On bark-covered and decorticated branches of frondose species 

 on the ground. In Europe, Canada to Louisiana, and westward 

 to the Pacific States and in Japan and in Natal, Africa. May to 

 January. Infrequent but widely distributed. 



P. cremea is readily recognizable among the species of the 

 northern United States and Canada by its thick, white or creamy 

 fructifications which have small spores, lack gloeocystidia, and 

 are 2-layered with the thick under layer composed of coarse, 

 loosely arranged, erect hj-phae branching at an angle of towards 

 60° and often dichotomously. These hyphae and their arrange- 

 ment are distinctive. P. mutata has the same aspect and color 

 but differs by much longer spores and the presence of gloeo- 

 cystidia. P. velutina has its hyphae ascending obliquely to the 

 hymenial layer. 



Specimens examined: 

 Sweden: L. Romell, 196; Femsjo, L. Romell, 218. 

 Germany: Westphalia, Lengerich, Brinkmann, 341, determined 



and communicated by Bresadola. 

 Russian Poland: Eichler, determined and communicated by 



Bresadola. 

 Austria: Tirol, Gries, V. Litschauer; Innsbruck, V. Litschauer; 



Stiermark, V. Litschauer. 

 France: Aveyron, M. Galzin, 13292, comm. by H. Bourdot, 20856. 

 England: Doncaster, E. M. Wakefield (in Mo. Bot. Gard. Herb., 



57126). 

 Canada: /. Macoun, 24- 

 New Hampshire: Chocorua, E. A. Burt. 

 Vermont: Bristol, E. A. Burt, two gatherings; Middlebury, E. A. 



Burt, two gatherings. 

 Massachusetts: Magnolia, TT^ G. Farlow, a; Sharon, A. P. D. 



Piguet, comm. by W. G. Farlow. 

 New York: East Gal way, E. A. Burt, three gatherings; Bergen 



