[Vol. 7 



118 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications somewhat membranaceous, soft, spongy, 

 sometimes resupinate, usually becoming conchate-reflexed, often 



imbricated, villose, becoming glabrous, 

 somewhat concentrically sulcate, drying 

 snuff-brown to bister; hymenium even, 

 glabrous, white, drying cream-color to 

 pallid mouse-gray; in structure 1000 m 

 thick, composed of longitudinally and 

 loosely interwoven hyphae 3 \i in diam- 

 eter, colored towards the upper surface, 

 hyaline towards the hymenium; hyme- 

 nium not zonate, containing nexuous 

 gloeocystidia 20-60X5-7 /*, rarely 90 m, 

 long; spores hyaline, 3-4^X2-3 //. 



Reflexed pileus 1-4 cm. long, 2-5 cm. 

 wide; resupinate specimens 3-10X1-3 cm. 

 On rotting frondose limbs usually, but 

 sometimes on pine. Canada to Texas, 

 westward to Oregon, in the West Indies, 

 and also in Europe. April to December. 

 Not rare. 

 Reflexed specimens of S. fuscum may be recognized at sight 

 by the soft, pliant pileus, brown and felt-like above, with a white 

 hymenium. Gloeocystidia are so rare in the hymenium of a 

 Stereum that their presence in abundance in this species affords 

 a decisive specific character. Wholly resupinate specimens 

 have the color of the hymenium of reflexed fructifications and 

 have similar consistency and gloeocystidia. So many reflexed 

 species occur resupinate that one should be sure to gather the 

 more or less reflexed fructifications which can usually be secured 

 associated with the resupinate specimens. Since both Persoon 

 and Fries recognized the priority of Schrader's specific name/ws- 

 cum and substituted bicolor, presumably because highly distinc- 

 tive and appropriate for the species, the restoration of the 

 original name by recent mycologists seems just. 



Specimens examined: 

 Exsiccati: Ellis, N. Am. Fungi, 1207; Ell. & Ev., Fungi Col., 

 1019; Rabenhorst, Fungi Eur., 3233; Ravenel, Fungi Am., 

 9; Ravenel, Fungi Car. 2:33; de Thumen, Myc. Univ., 

 1704. 



Fig. 10. S. fuscum. 

 Gloeocystidia and spores 

 X 665. 



