640 RADTJLUM 



2167. R. orbiculare Fr. Grev. Scot. Crypt. Fl. t. 278. Orbiculare, round. 

 R. 2-5-15 cm., white, then yellowish, orbicular, confluent; margin 



white, byssoid, membranaceous. Tubercles concolorous, or dingy flesh 

 colour, 2-6 mm. long, cylindrical, scattered, or fasciculate. Flesh 

 whitish, or yellowish, waxy fleshy, thin, 2-4 mm. thick. Spores white, 

 cylindric oblong, slightly curved, 8-12 x 3-5/u,. Dead bark of birch, 

 cherry, willow, aspen, hornbeam, pine, and fir. Jan. Dec. Common. 

 (v.v.) 



var. junquillinum Quel. Junquillinum, bright yellow. 



Differs from the type in its bright yellow colour. Pine. March. Un- 

 common, (v.v.) 



2168. R. quercinum Fr. (= Radulum fagineum (Pers.) Fr. sec. Bourd. 

 & Galz.) Quercinum, pertaining to oak. 



R. 5-30 cm., white, then pallid or tan colour, somewhat round, then 

 broadly confluent, adnate, often throwing back the bark; margin 

 white, villose^occose. Tubercles concolorous, 4-6 mm. long, cylindrical, 

 obtuse, pointed, or toothed, scattered, or fasciculate, often villose at 

 the apex. Flesh whitish, or yellowish, crustaceous waxy, thin, 2-4 mm. 

 thick. Spores white, oblong subcylindric, very slightly depressed on 

 one side, 5-7-8-5 x 2-5-4 JLI, guttulate" Bourd. & Galz. Fallen 

 branches, especially oak, also worked wood. Jan. Dec. Common, (v.v.) 



2169. R. molare Fr. (= Radulum membranaceum (Bull.) Bres. ; ? Cor- 

 ticium confluens Fr. a form sec. Bourd. & Galz.) Pers. Myc. 

 Eur. n, t. 22, fig. 1, as Sistotrema molariforme Pers. 



Molare, a molar tooth. 



R. 5-10 cm., pale, yellowish, or tan colour, orbicular, confluent, 

 widely effused, adnate, firm, cracked when dry; margin byssoid, or 

 radiately fibrillose. Tubercles concolorous, 2-3 mm. long, deformed, 

 cylindrical or conical, scattered, or confluent and connate, smooth, 

 or fimbriate. Flesh whitish^ waxy, thin. Spores white, "elliptical, 

 subglobose, 7-5-9-13 x 5-7-8^" Bourd. & Galz. Fallen oak, -and 

 birch branches. Jan. Dec. Not uncommon, (v.v.) 



2170. R. mucidum (Pers.) Bourd. & Galz. nee Hydnum mucidum Fr. 



Mucidum, mucid. 



R. 5-10 cm., yellow, effused, separable, more or less nodular, gla- 

 brous, or pubescent; margin fibrillose. Tubercles concolorous, short, 

 scattered, subulate, elongate when growing on an upright surface. 

 Flesh yellowish, soft, thin. Spores ferruginous in the mass, very pale 

 yellow under the microscope, elliptical to subglobose, with a lateral 

 apiculus, 4-5 x 3-5-4/z, 1-guttulate; basidia clavate, 7/n in diam. 

 with 4-sterigmata. Hyphae thin walled, frequently septate, with 

 clamp connections, 4-7 /u, in diam. Inside a hollow stump, and grow- 

 ing over living stems of ivy. Nov. Rare, (v.v.) 



