[Vol. 12 



344 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



cystidia incrusted, slightly colored, fusiform, 24-33 X 12-15 y., 

 few, immersed in the hymenial layer; spores of a crushed prep- 

 aration cylindric, hyaline, even, curved, 8-10 X 2-3 \l. 



Fructifications 3-9 cm. long, 1-1 H cm. wide. 



On bark of dead branches about 1-% cm. in diameter, of 

 frondose species. Louisiana. December. 



P. colorea belongs near the P. cinerea group of very variable 

 species. It may well prove that P. colorea is not a specifically 

 distinct member of this group when more abundant material 

 from southern Louisiana is available, but it seems to me distinct 

 now by the longitudinal layer next to the substratum, light drab 

 color throughout, few, large, slightly colored cystidia which are 

 confined to the hymenial layer, and by the slender, elongated 

 spores. 



Specimens examined: 

 Louisiana: St. Martinville, A. B. Langlois, ch, type. 



114. P. decorticans Burt, n. sp. 



Type: in Burt Herb. 



Fructifications long-effused, closely adnate, very thin, growing 

 on the wood, spreading longitudinally and laterally between the 

 wood and bark, loosening the latter, pale pinkish buff and pale 

 gull-gray to whitish, pruinose, with occasional tubercules in some 

 specimens; in section brownish throughout, 50-90 \l thick, not 

 zonate, composed of densely arranged, interwoven, slightly 

 colored, erect hyphae 3 {x in diameter, with no darker and opaque 

 zone next to the substratum; cystidia few, incrusted, ovoid to 

 subglobose, up to 20-25 X 15 y., seen only in the region next to 

 the substratum; paraphyses with slender, antler-shaped branches 

 protrude from hymenium; spores hyaline, even, slightly curved, 

 8-9 X 3 (a, few seen. 



Fructifications 1-2 cm. wide, 2 cm.-6 m. long, on under side of 

 dead branches along which the loosened bark curls back laterally. 



On Quercus Garry ana, Acer macrophyllum, and Rhus diver si- 

 loba. Washington and Oregon. February to December. Com- 

 mon locally. 



P. decorticans differs from P. cinerea, P. nuda, P. caesia, and 

 P. violaceo-livida in not being so dark as to be opaque next to the 



