1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 143 



eley, Brit. Fungi, 271. 1860; Sacc. Syll. Fung. 6: 572. 1888; 

 Massee, Linn. Soc. Bot. Jour. 27: 191. 1890. 



Plate 4, figs. 38, 39. 



Thelephora rugosa Persoon, Syn. Fung. 569. 1801; Myc. 

 Eur. 1: 127. 1822; Albertini & Schweinitz, Consp. Fung. 274. 

 1805; Fries, Syst. Myc. 1: 439. 1821; Elenchus Fung. 1: 177. 

 1828. 



Illustrations: Istvanfn, Jahrbuch. f. wiss. Bot. 29: pi. 4 

 /. 11; pl.5.f. 19. 



Fructifications coriaceous-corky, usually resupinate and 

 effused, with a narrow, free, marginal portion, or sometimes 

 reflexed, silky at first and pinkish buff, at 

 length concentrically furrowed, radially 'VsSKft 





pitted and weathering gray, the margin 

 thick, entire; hymenium dull, pruinose, 

 drying pinkish buff to drab-gray, when 

 fresh bleeding where wounded; in struc- 

 ture 500-1800 fi thick, with the interme- 

 diate layer bordered on the upper side by 

 a dense golden zone and on the lower side Flg - 19# Sm ru 9 sum ' 



, . . , , . , , Section X 19; interme- 



by a two- to many-zoned hymemal layer diate layer> i; dense 

 120-1200 n thick, hyphae of intermediate golden zone, z; the scat- 

 layer 2-3 /* in diameter; dark-colored tered darker lines in 



1 .. n hymenial zones show 



conducting organs very numerous, 3-6 M d f stribution of conduct _ 

 in diameter; no cystidia; spores hyaline, ing organs. 

 even, flattened on one side, 7-10X3-4 ju. 



Resupinate on areas 2-6 cm. in diameter; free or reflexed 

 margin 2-12 mm. broad. 



On stumps of Alnus, Corylus, Quercus, Betula, and other fron- 

 dose species. Newfoundland, Ontario, New York, and moun- 

 tains of North Carolina. July to October. Rare in North 

 America, common in Europe. 



Although usually resupinate and likely to be regarded as a 

 Corticium by collectors, nevertheless sectional preparations 

 show the highly developed characteristic structure of a Stereunij 

 with intermediate layer of longitudinally arranged hyphae, 

 golden crust, etc. The bleeding of the hymenium and the abun- 

 dant colored conducting organs locate the species among the 

 Stereums in the group with S. gausapatum, S. australe, and S. 



