CORTICIUM 681 



II. Hymenium homogeneous, regular, consisting of basidia only. 

 Hyphae occasionally septate, with either normal clamp con- 

 nections, or with clamp connections two to three times larger than 

 the normal, and tuberosely swollen at the septa. Growing in humus 

 and on very decayed wood and rubbish. 



2309. C. confine Bourd. & Galz. Trans. Brit. Myc. Soc. iv, t. 3, 

 figs. 12-14. Confine, nearly related. 



R. 310 cm., snow white, becoming yellowish, superficially like Gran- 

 dinia farinacea, widely effused, arachnoid ; margin white, byssoid, 

 somewhat radiating, gradually attenuated. Hymenium white, be- 

 coming cream colour, or ochraceous, granular, like a Grandinia, granules 

 waxy, crowded when fresh, shrinking away from one another, and 

 revealing the white subiculum when dry. Flesh white, fibrillose, loose. 

 Spores white, sub globose, pointed at the base, 3-4 x 2-3 p, usually 

 1-guttulate; basidia 9-15 x 3-5 /A, with 2-4 straight, or slightly 

 curved sterigmata, 2-4ju, long. Basal hyphae 2-4/A in diam., with 

 clamp connections, and often swollen at the septa. Mycelium often 

 forming fine branching cord-like strands beneath the bark. Rotten 

 wood, bark, and twigs. Jan. Dec. Not uncommon, (v.v.) 



III. Hymenium heterogeneous, irregular, consisting of basidia origina- 

 ting at the base of the trama, and surrounded by sterile, undiffer- 

 entiated, mycelial branches. 



2310. C. comedens (Nees) Fr. (= Vuilleminia comedens (Nees) R. 

 Maire; Radulum botrytes Fr. sec. Quel. ; ? Corticium Carlylei 

 Massee sec. Wakef. in litt.) Trans. Brit. Myc. Soc. iv, t. 3, 

 fig. 25. Comedens, eating away. 



R. 1-13 cm., flesh colour, or dingy lilac, becoming pale, erumpent, 

 effused, innate, growing under the bark, inseparable, slightly viscid 

 when moist. Hymenium concolorous, smooth, even. Flesh paler, 

 subgelatinous, then rigid, firm. Spores white, sausage-shaped, curved, 

 15-22 x 6-7 jit, 2-4-guttulate. "Basidia scattered, very long, 9-12/u,in 

 diam., with 2-4 curved sterigmata, 8-10 x 3^" Bourd. & Galz. Dead 

 branches, and felled trunks, especially oak. Jan. Dec. Common, (v.v.) 



IV. Doubtful British species insufficiently described. 



2311. C. nigrescens (Schrad.) Fr. (? = Radulum aterrimum Fr. sec. 

 Quel.; Corticium comedens (Nees) Fr. discoloured sec. Wakef. 

 in litt.) Nigrescens, becoming black. 



R. 2-7-5 cm., yellowish, erumpent, effused, interrupted, agglutinated, 

 inseparable; margin indeterminate. Hymenium yellowish, becoming 

 blackish, spuriously papillose, waxy, pruinose. Flesh waxy, very thin. 

 Spores white, " cyh'ndric-oblong, obtuse at both ends, curved, 18-20 x 

 5-6 ju," Massee. Dead oak and beech branches, growing beneath the 

 bark. Rare. 



