STEREUM. HYMENOCHAETE 667 



densely interwoven, hyaline hyphae with walls gelatinously modified, 

 the subhymenium olivaceous-coloured. Spores hyaline, curved, 5-6 x 

 2-2-5/u. Cystidia hyaline, incrusted, 24 x 8/i, sometimes very sparse. 

 Gloeocystidia hyaline, fusoid, or irregular, 30-40 x 10-15/i, sparse" 

 Burt. Pine bark. Nov. Eare. 



2264. S. rufum Fr. (= Stereum rufomarginatum (Pers.) Quel.; British 

 records of this plant = Eichleriella spinulosa (Berk. & Curt.) 

 Burt, sec. Wakef.) Burt, The Thelephoraceae of North 

 America, xn, Stereum, p. 121, text-fig. 11. Rufum, red. 



R. 2-4 mm., vinaceous~brown to hematite red, erumpent, tuberculi- 

 form, then somewhat round, marginate, smooth beneath. Hymenium 

 vinaceous-brown, often greyish pruinose, becoming coarsely wrinkled. 

 Flesh coriaceous-fleshy, firm, fairly thick, "composed of ascending 

 loosely interwoven, incrusted, hyaline hyphae, 4^4-5 fj, in diam. over 

 the incrustation. Spores white, oblong, curved, 6-8 x 1-5-2 /A. Cys- 

 tidia none. Gloeocystidia hyaline, flexuose, 50-90 x 7-10/i, scattered, 

 not protruding" Burt. Poplar. Sept. March. Uncommon. 



S. acerinum (Pers.) Fr. = Aleurodiscus acerinus (Pers.) von Hoehn. 

 & Litsch. 



Hymenochaete Lev. (= Stereum (Pers.) Massee p.p.). 

 (vfirjv, a membrane; %atT/7, long flowing hair.) 



Receptacle coriaceous, firm, sessile, effuso-reflexed, or resupinate. 

 Hymenium inferior, with an intermediate layer, setulose, or velvety, 

 even, rarely granular. Spores white, or coloured, elliptical, oval, sub- 

 globose, oblong, fusoid, or cylindrical ellipsoid; smooth. Cystidia or 

 setae present, coloured. Perennial. Growing on wood. 



I. Sessile, effused, free and reflexed. 



2265. H. rubiginosa (Dicks.) Lev. (= Stereum rubiginosum (Schrad.) 

 Fr.) Sow. Brit. Fung. t. 26, as Auricularia ferruginea. 



Rubiginosa, rusty. 



R. 3-15 cm., rubiginous, or brownish rust colour, margin ochraceous 

 tawny, effused, reflexed, sometimes entirely resupinate, separable, 

 rigid, somewhat fasciate, concentrically sulcate, velvety, becoming 

 smooth and date brown. Hymenium ferruginous, or bistre, setulose, 

 subcolliculose. Flesh tawny ferruginous, coriaceous, firm, intermediate 

 layer "composed of longitudinally arranged, coloured hyphae, 2-5^t 

 in diam., and bordered above by a narrow, dense, dark zone" Burt. 

 Spores white, elliptical, 4-6 x 2-3/u,. Setae coloured, crowded, acutely 

 conical, slightly curved, 50-70 x 5-7 />t. Stumps, branches and logs 

 of frondose trees. Jan. Dec. Common, (v.v.) 



