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

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

 1828. 



Illustrations: Istvanffi, Jahrbuch. f. wiss. Bot. 29: pi. 4- 

 f. 11; pi 5.f. 19. 



Fructificatipns 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 't'v'\i<(v\'<'\''W. 



pitted and weathering gray, the margin ''•••'f^^^ 



thick, entire; hymenium dull, pruinose, ^Sfev^\|!4 



drying pinkish buff to drab-gray, when ^^i^^'^S^^I*^ 



fresh bleeding where wounded; in struc- |^^^^^^ •^ 



ture 500-1800 ^l thick, with the interme- ^^^^^^^^-^^ f 

 diate layer bordered on the upper side by 

 a dense golden zone and on the lower side ^ ^l^- ^^- ,f • ™f '"'"• 



° • 1 1 Section X 19; mterme- 



by a two- to many-zoned hymenial layer ^:^^^^ i^y^j.^ ^^ ^^^^^ 

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

 layer 2i-3 IX in diameter; dark-colored tered darker Unes in 



, , . n ^ hymenial zones show 



conducting organs very numerous, 3-6 m distribution of conduct- 

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

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



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 Stereum, 

 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. 



