[Vol. 12 

 29G ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications broadly effused, thick, waxy-membranaceous, 

 separable from the substratum, somewhat horn-like and requiring 

 moistening for a short time before sectioning, pinkish buff to 

 light ochraceous-buff in the herbarium, somewhat pulverulent, 

 the margin finally free and rolling up from the substratum; in 

 section 500-600 [x thick, not colored, composed of densely ar- 

 ranged hyphae 3-33/^ [x in diameter, which run longitudinally 

 along the substratum and then curve obliquely into the hymeni- 

 um; between the hyphae occur numerous slightly more deeply 

 staining elongated organs of the nature of conducting organs or 

 slender gloeocystidia; cystidia incrusted, cylindric, 6-8 [x in diam- 

 eter, protruding up to 30 ;jl beyond the basidia, very numerous 

 in the hymenial surface, the incrusted part about 20-45 [x long; 

 no spores found. 



Fructification 9 cm. long, 33^ cm. wide. 



On a dead stub about 23^2 cm. in diameter, of Salix sp. Idaho. 

 June. 



P. lepida has some resemblance to P. gigantea but is not quite 

 as gelatinous in consistency as P. gigantea and occurs on Salix. 

 The slender conducting hj^Dhae or gloeocystidia should aid in 

 recognizing the species. The broad layer of hyphae arranged 

 longitudinally along the substratum and then curving outward 

 into the hjTiienium is very like that of a resupinate Stereum but 

 I recall no pileate Stereum of similar structure. 



Specimens examined: 

 Idaho: National Forest, 50 miles east of Orofino, A. S. Rhoads (in 



Weir Herb., 16744, t:yTDe). 



72. P. Kauffmanii Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb., and probably in Kauffman 

 Herb. 



Fructifications long-effused, rather thin, adnate, small portions 

 separable when moistened, between pale pinkish buff and tilleul- 

 buff , not cracked, not w^axy nor shining, the margin determinate, 

 thinning out; in section 300-350 ;x thick, 2-layered, with both 

 layers of about equal thickness and the hymenial layer somewhat 

 honey-yellow, the layer next to the substratum not colored, com- 

 posed of loosely and longitudinally interwoven, thin-walled, 



