1918] 
BURT—THELEPHORACEAE OF NORTH AMERICA. X 349 
к= 
stratose, composed of 1-3, or rarely up to 5, pairs of setig- 
erous and hyphal layers, with the setigerous layers very dense, 
about 45-200 џ thick, exceeding the alternating hyphal layers 
which are composed of loosely inter- 
woven, thick-walled, colored, even | |, yan ІШ 
hyphae 3 шіп diameter; setae numer- | ЙІ t 1 
ous, slender, subfaleate, 60-75<6 и, jl lj 
originating at all levels in each setig- Т | 11 || І 
erous layer, protruding up to 50 p; ҰШ UN 
spores hyaline, even, 41x24 и. i ШІ (ІСІ ТҚ 
Fructifications 4-25 2-10 em. WU | Ini 
Usually on decaying wood of fron- 
dose species, rarely on coniferous 
wood. Canada to Alabama and west- section M Жена Avie: 
ward to Washington, California, and 
British Columbia. April to January. Common. 
The stratose structure of well-developed fructifications of 
H. spreta locates this species in a small group of three species, 
of which the others are H. digitata and H. cinnamomea, from 
both of which thick fructifications of H. spreta may be sep- 
arated readily by being deeply cracked and having setigerous 
layers from 45-150 y, or rarely more, in thickness, very com- 
pact, and exceeding in thickness the adjoining, loosely inter- 
woven hyphal layers. Fructifications of H. spreta in its first- 
stratum stage, consisting of but one hyphal layer and one 
setigerous layer, are frequently not cracked but have the 
setigerous layer 45 и or more thick and thicker than the hyphal 
layer. 
Specimens examined: 
Exsiccati: Ell. & Ev., N. Am. Fungi, 1936, 3304 — the latter 
under the name Hymenochaete unicolor; Ell. & Ev., Fungi 
Col., 806, under the name H. unicolor. 
Canada: Comox, Van Island, J. Macoun, 18. 
Prinee Edward's Island: J. Macoun, 344. 
Ontario: London, J. Dearness; Ottawa, J. Macoun, 6. 
New Hampshire: Chocorua, W. G. Farlow, two collections, one 
of whieh (in Mo. Bot. Gard. Herb., 55258). 
Vermont: Middlebury, C. G. Lloyd, 10671 (in Lloyd Herb., 
