166 Journal of the Mitchell Society [February 



2. Hypochnus fuscus Pers. 



Plate 32 



Plant entirely resupinate and not removable as a membrane 

 (Burt says separable), 300-oOOtJL thick, more felted than hypochnoid, 

 ferruginous-brown (dark cinnamon brown with brighter areas of 

 Sudan brown) in center to light gray on the indeterminate margin, a 

 slight vinaceous tint observable throughout or in places. Sections 

 show such a packing of crystals as to make the structure unintelli- 

 gible without the application of KOH (which dissolves the crystals); 

 after such treatment the context is found to be composed of loosely 

 packed, much septate and much branched hyphae 3.7-7.5[jl thick, 

 with clamp connections and bladder-like swellings up to IO-S^jl thick. 

 Hymenium composed of basidia 7.7-25.9[jl, with four curved sterig- 

 mata and a few pointed structures which arise from the bases of 

 the basidia. Spores smoky brown, irregularly angled and spiny, 

 5-7.4 X 7.4-9.3[x. 

 4267. On very rotten deciduous wood, April 18, 1920. 



HYMENOCHAETE 



Habit like that of a Corticium or small Stereum, that is, forming 

 on dead wood an entirely resupinate crust or with the margin free 

 and projecting like a bracket. Differing from these in the presence 

 in the hymenium of elongated, smooth, dark, spine-like projections 

 (setae) which extend beyond the basidia. Peniophora differs in the 

 colorless cystidia which are usually set w4th warts and crystals, and 

 which may or may not project beyond the basidia. We include but 

 three species to represent the genus. For a full treatment, see Burt, 

 in Ann. Mo. Bot. Gard. 5: 301. 1918. Also see Massee, in Journ. 

 Linn. Soc. 27: 95. 1890. 



Key to the Species Treated 



Hymenial surface not tomentose-felted 



Color a deep rich brown; the margin usually free H. Curtisii (1) 



Color slate-brown when wet, clay-brown when dry; margin not 



free H. corrugata (2) 



Hymenial surface tomentose-felted, at least on the margin; usu- 

 ally rusty or brownish red, the margin paler H. agglutinans (3) 



