1916] 
BURT—THELEPHORACEAE OF NORTH AMERICA VI 213 
5. H. umbrinus (Fries) Burt, n. comb. 
Thelephora umbrina Fries, Elenchus Fung. 1:199. 1828, 
but not T. wnbrina Alb. & Schw. Consp. Fung, 281. 1805. — 
Corticium umbrinum Fries, Hym. Eur. 658. 1874. — Thele- 
phora biennis Fries, Hym. Eur. 636. 1874, but not T. biennis 
Fries, Syst. Мус. 1:449. 1821. — T. arachnoidea Berk. 6 
Broome, Linn. Soc. Bot. Jour. 14:64. 1873, but not T. arach- 
noidea as understood by Bresadola, Ann. Mye. 1:108. 1903. — 
Hypochnus tristis Karsten, Soc. pro Fauna et Flora Fennica 
Meddel. 9:71. 1883; Bresadola, Ann. Mye. 1:107. 1903. — 
Hypochnopsis fuscata Karsten, Finl. Basidsv. 443. 1889. — 
Hypochnus fuscatus Karsten in Басс. Syll Fung. 9:244. 
1891. — Tomentella tristis (Karst.) v. Норте! & Litschauer, 
K. Akad. Wiss. Wien Sitzungsber, 115:1572. 1906. — Hypoch- 
nus sitnensis Bresadola, I. R. Ассай. Agiati Atti III. 3:115. 
1897. 
Type: in Herb. Fries, and an authentic specimen from 
Fries in Kew Herb. 
Fructification effused, soft, separable, with the hymenial 
surface compact and membranaceous, varying from drab to 
fuscous and Chaetura-drab, underneath vil- 
lose; structure in section 400-600» thick, with [ү у 
some hyphae running along the substratum | y 
and ascending so as to form a loosely ar- Wy 
ranged layer near the substratum and then 
branching repeatedly to form a compact hy- & 
menium; hyphae concolorous with the fruc- ` 
tification, thick-walled, not nodose-septate, not Fig. 5 
rough-walled, 4-би in diameter; basidia with H. umbrinus. 
4 sterigmata; spores concolorous, globose or Ез тиер 
subglobose, aculeate or coarsely tuberculate, 
6-7» in diameter or 6-8 X 415-7»; KHO solution dissolves 
some pigment from the sections and becomes dark-colored 
in their vicinity. 
Fructifications 6-10 em. long, 3-5 em. broad. 
On rotting coniferous and frondose wood. New England 
to British Columbia. September to October. Common and 
cosmopolitan. 
