1925] 



BURT — THE THELEPHORACEAE OF NORTH AMERICA. XIV 333 



120 (X thick, composed of densely arranged, erect tissue; no gloeo- 

 cystidia nor conducting organs; cystidia incrusted, 40-50 X 

 8-15 [I, numerous, immersed, starting from the base of the 

 hymenial layer; spores hyaline, even, 8-10 X 2-3 [i. 



Fructifications probably large, for those studied are 4 cm. 

 long by 4 cm. wide and broken off on three sides. 



On bark of coniferous log. British Columbia. September. 



P. separans has some resemblance in color and aspect to 

 P. ciliata and resupinate Stereum sanguinolentum, but the stouter, 

 wholly immersed cystidia distinguish P. separans from the former 

 species, and the presence of cystidia and lack of conducting 

 organs from the latter. The type has two strata, the other 

 specimen only a single stratum of two layers. 



Specimens examined: 

 British Columbia : Porcupine Creek, south of Beavermouth, C. W. 



Dodge, 1702, type, and 170 J^ (in Mo. Bot. Gard. Herb., 58797, 



58798, and in Dodge Herb.). 



102. P. stratosa Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb. 



Fructifications broadly effused, adnate, thick, stratose, some- 

 what cartilaginous-coriaceous, hard when dry, becoming pinkish 

 buff to light ochraceous buff in the herbarium, cracking in drying 

 and showing the stratose context, the margin thinning out; in 

 section 700 fx thick, pale yellowish, composed of 8 strata in the 

 type, with the hyphae hyaline, densely interwoven and con- 

 glutinate, about 2-23/2 \^ iii diameter; cystidia incrusted, conical, 

 45-55 X 10-13 [X, protruding up to 40 tx, present in all strata but 

 more abundant and conspicuous in the outer half of the fructi- 

 fication and less distinct and perhaps becoming absorbed in the 

 more deeply buried strata; spores copious, hyaline, even, 4-5 X 

 2-2H^. 



Fructification 8 cm. long, 33/2 cm. wide in the single piece con- 

 stituting the type, which has natural margin on one side only and 

 was broken from a larger mass. 



On Quercus densiflora and Eucalyptus. California and Mexico. 

 September. 



P. stratosa is related to P. similis but has larger cystidia and 

 spores. 



