1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 333 



composed of longitudinally arranged, colored hyphae 2^ n in 

 diameter and bordered above by a narrow, dense, dark zone ; 

 setae very numerous, slightly curved, tapering upward to a 

 very sharp point, 50-60x5-6 n, emerging up to 45 /x, starting 

 from all parts of the setigerous layer; spores hyaline, even, 

 4-6x2-3 /x. 



Fructifications with reflexed portion 1-2| cm. long, 1-3 cm. 

 broad and sometimes larger by lateral confluence ; resupinate 

 portion 7-8x1-3 cm. 



On decaying logs and stumps of oak and other frondose 

 species. Canada to Mexico, westward to Oregon and Cali- 

 fornia, and in Porto Eico. July to February, persisting to 

 June. Common. 



H. ruhiginosa may be recognized by its rigid pileus, velvety, 

 concentrically sulcate, and Brussels-brown (rubiginous) in 

 color, by the colliculose, bister hymenium whose dark red com- 

 ponent color and setae show to advantage in reflected light, 

 and by the brighter ochraceous margin. Even resupinate 

 specimens may be recognized at sight by being separable from 

 the substratum, and by the form and color of the hymenium 

 and the contrasting bright margin. The structure in section 

 is equally constant and distinctive. This species produces a 

 pocketed heart rot in oak wood. 



Specimens examined: 

 Exsiccati: Bartholomew, Fungi Col., 3133; Berkeley, Brit. 



Fungi, 247; Ellis, N. Am. Fungi, 327; Kunze, Fungi Sel., 



203; Rabenhorst, Herb. Myc, 212. 

 England: in Berkeley, Brit. Fungi, 247; Kenilworth, W. A. 



Murrill (in N. Y. Bot. Gard. Herb., and in Mo. Bot. Gard. 



Herb., 55542). 

 Sweden: Upsala, E. Fries, det. by Fries as Stereum ferru- 



gineum, comm. by L. Romell, 27; Femsjo, L. Romell, 35; 



Halland, L. Romell, 36; Lapland, L. Romell, 396, 397. 

 Germany: J. Kunze, in Kunze, Fungi Sel., 203 (in Mo. Bot. 



Gard. Herb., 44098) ; from Persoon, under the name The- 



lephora ruhiginosa (in Kew Herb.); Dresden, in Raben- 



horst, Herb. Myc, 212. 



