1921] The Thelephoraceae of North Carolina 165 



dently of cellular origin and are formed apparently through the 



development of a single cell. Spores cream with a faint fawn tint 



in a heavy print, subspherical, angled or slightly tuberculate, 5-6[i 



thick, 



4507. On very rotten oak wood and bark, south of athletic field, July 25, 1920. 



HYPOCHNUS 



Entirely resupinate, dry and coriaceous, felt-like or hypochnoid, 

 that is, with the hyphae loosely woven throughout; hymenium even 

 or papillose; basidia simple, four-spored; the spores rough or echinu- 

 late, distinctly colored in most species. The plants are saprophytic 

 on rotten wood, and usually grow on the under-side of logs. Burt 

 records 30 species from North America (Ann. Mo. Bot. Gard. 3: 203. 

 1916) of which several are mentioned from North Carolina. We are 

 including two species to represent the genus. See also Wakefield, 

 in Trans. Brit. Myc. Soc. 5: 476. 1917; Bourdot and Galzin, Bull. 

 Soc. Myc. Fr. 28: 354. 1912 (as Gleocystidium in part). 



Key to the Species Treated 



Color deep red-brown; surface very granular H. atroruber (1) 



Color rusty brown with margin paler; surface felted H. fuscus (2) 



1. Hypochnus atroruber (Pk.) Burt. 

 Zygodesmus atroruber Pk. 



Entirely effused, thin, of a granular appearance, color a deep 

 red-brown, about argus brown of Ridgway on the surface, the lower 

 interior and the very thin, indefinite, hypochnoid margin a much 

 lighter, honey color. Context of loosely interwoven, frequently 

 branched, clamp-connected hyphae, paler and more delicate in the 

 lower regions, about 4.5[jl thick, reddish and coarser above, about 

 6-7.5[jL thick; a few large strands next the substratum 15-1 8[jl thick. 



Spores brown under microscope, subspherical, echinulate, 5.5-7 X 

 6-7.7[x. 



Our plants agree with Ellis No. 1390 of his North American Flora 

 (on cedar) and with other collections on pine bark by Underwood, 

 etc., at the New York Botanical Garden. They also agree well with 

 Burt's description (1. c, p. 230). Peck found the type on poplar 

 and Burt does not mention conifers, but all collections we have seen 

 were on pine or cedar. 

 4692. On pine bark, spring of 1920. 



