1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 



325 



11. H. tabacina Sowerby ex Leveille, Ann. Sci. Nat. Bot. III. 



5 : 152. 1846; Cooke, Grevillea 8 : 145. 1880; Sacc. Syll. Fung. 



6 : 590. 1888; Massee, Linn. Soc. Bot. Jour. 27 : 112. 1890. 

 Helvella nicotiana Bolton, Hist. Funguses, 174. pL 174. 1789. 



Auricularia tabacina Sowerby, British Fungi, pi, 25. 1797. 

 Thelephora tabacina (Sow.) Fries, Syst. Myc. 1:437. 1821; 

 Elenchus Fung. 1 : 173. 1828. Stereum tabacinum (Sow.) 

 Fries, Epicr. 550. 1838; Hym. Eur. 641. 1S7 4:. Thelephora 

 avellana Fries, Syst. Myc. 1 : 442. 1821 (in part) ; Elenchus 

 Fung. 1 : 188. 1828 (in part). Stereum avellanum Fries, 

 Epicr. 551. 1838 (in part); Hym. Eur. 642. 1874 (in part). 

 Hymenochaete avellana (Fr.) Cooke, Grevillea 8 ; 146. 1880; 

 Sacc. Syll. Fung. 6 : 592. 1888 ; Massee, Linn. Soc. Bot. Jour. 

 27 : 103. 1890. Thelephora imbricatula Schweinitz, Am. Phil. 

 Soc. Trans. N. S. 4 : 166. 1832. Hymenochaete imbricatula 

 (Schw.) Leveille, Ann. Sci. Nat. Bot. III. 5 : 152. 1846; Cooke, 

 Grevillea 8 : 146. 1880; Massee, Linn. Soc. Bot. Jour. 27 : 103. 

 1890.-5'. imbricata Sacc. Syll. Fung. 6 : 593. 1888. 



Illustrations: Bolton, Hist. Funguses, pi. 174; Sowerby, 

 British Fungi, pi. 25 type illustration. 



Fructifications coriaceous, eifuso-reflexed, often imbricated, 

 sometimes wholly resupinate, thin, sericeous, antique brown, 

 at length becoming gla- 



brous and deep brownish 

 drab, the margin and inter- 

 mediate layer orange-yel- 

 low ; hymenium snuff- 

 brown to sepia, often 

 deeply cracked where re- 

 supinate, with a series of 

 radial anastomosing cracks 

 for each centimeter of 

 area; in structure 340-600 

 n thick, with the setigerous 

 layer 100 ^ thick, and with the intermediate layer bor- 

 dered on each side by a narrow, dark, dense zone; hyphae 

 2J-3 /Li in diameter, orange-yellow, longitudinally arranged 

 in the intermediate layer; setae 60-90x6-12 /*, emerging up 



Fig. 9 

 H. tabacina. 

 Section, a, X 68; system of radiating 

 cracks in hymenium, r, X 4^. See pi. 17, 

 f. 16. 



