[Vol. 12 



342 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



showing the underlying pale substance, the true margin un- 

 known ; in section 360-450 (i thick, colored in the hymenial layer, 

 with the basal layer composed of obliquely ascending, loosely 

 interwoven, thin-walled, hyaline hyphae 3-4 y. in diameter, not 

 incrusted, not nodose septate, and of thick-walled, non-staining, 

 hyaline organs 4J/2 ^ hi diameter, not incrusted, whose pointed 

 tips protrude as cystidia up to 12 ^ beyond the basidia; spores 

 hyaline, even, 6 X 4J^ [l few found and may not belong. 



Fragmentary fructifications not having margin are 4 cm. long, 

 2 cm. wide. 



On dead cane. Nicaragua. 



P. rimosissima is closely related in color and structure to 

 Stereum umbrinum but has colorless cystidia not incrusted and 

 only 43/2-6 ^ in diameter, and thinner fructifications which are 

 not known yet to occur reflexed. 



Specimens examined: 

 Nicaragua: C. Wright, type (in U. S. Dept. Agr. Herb.). 



111. P. Weiri Bresadola, Mycologia 17: 70. 1925. 



Type: in Weir Herb. 



Fructifications long and broadly effused, thin, closely adnate, 

 becoming cream-buff to chamois in the herbarium, even, some- 

 what cracked, the margin thinning out; in section 150 y. thick, 

 concolorous with, and giving the color % to, the fructification, 

 composed of densely interwoven, rigid, slightly colored hyphae 

 2-33/2 ^ m diameter, not incrusted; gloeocystidia flexuous or 

 sometimes filamentous, 30-75 X 3-5 [x; cystidia not incrusted, 

 thin-walled, cylindric, obtuse, 6-8 pi in diameter, protruding up 

 to 40-50 [i beyond the basidia, not numerous; basidia with 4 

 sterigmata; spores hyaline, even, cylindric, 6-8 X 3-33^ (x, 

 copious. 



Fructifications 5-12 cm. long, 2-4 cm. wide. 



On wood of decaying logs of Pinus monticola. Idaho. Sep- 

 tember. 



The gloeocystidia of P. Weiri are unusual in their position, 

 since they are occasionally oblique or parallel with the substratum, 

 and more elongated then than when in the more usual, erect 

 position, nor did they become visible in my sections stained with 



