1916] 



BURT THELEPHORACEAE OF NORTH AMERICA VI 213 



O 5. H. umbrinus (Fries) Bnrt, n. comb. 



TJielephora umhrina Fries, Elenchus Fung. 1:199. 1828, 

 but not T. umhrina Alb. & Schw. Consp. Fung. 281. 1805. 

 Corticium umhrinum Fries, Hym. Eur. 658. 1874. TJiele- 

 phora biennis Fries, Hym. Eur. 636. 1874, but not T. biennis 

 Fries, Syst. Myc. 1:449. 1821. T. arachnoidea Berk. & 

 Broome, Linn. Soc. Bot. Jour. 14 :64. 1873, but not T. arach- 

 noidea as understood by Bresadola, Ann. Myc. 1 :108. 1903. 

 Hypochnus tristis Karsten, Soc. pro Fauna et Flora Fennica 

 Meddel. 9:71. 1883; Bresadola, Ann. Myc. 1:107. 1903. 

 Hypochnopsis fuscata Karsten, Finl. Basidsv. 443. 1889. 

 Hypochnus fuscatus Karsten in Sacc. Syll. Fung. 9:244. 

 1891. Tomentella tristis (Karst.) v. Hobnel & Litschauer, 

 K. Akad. Wiss. Wien Sitzungsber. 115:1572. 1906. Hypoch- 

 nus sitnensis Bresadola, I. R. Accad. 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 400-600fi thick, with 

 some hyphae running along the substratum 

 and ascending so as to form a loosely ar- 

 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 ^j 5 

 rough-walled, 4-5/a in diameter ; basidia with h. umbrinus. 

 4 sterigmata ; spores concolorous, globose or n^^haxelo 

 subglobose, aculeate or coarsely tuberculate, 

 6-7 iM in diameter or 6-8 X 4%-7/a; KHO solution dissolves 

 some pigment from the sections and becomes dark-colored 

 in their vicinity. 



Fructifications 6-10 cm. long, 3-5 cm. broad. 



On rotting coniferous and frondose wood. New England 

 to British Columbia. September to October. Common and 

 cosmopolitan. 



