678 CORTICIUM 



2299. C. trigonospermum Bres. Trans. Brit. Myc. Soc. iv, t. 3, 

 figs. 3-5. Tpiywvos, triangular; a-jrep^a, seed. 



R. 25 cm., chalk white, or becoming slightly tinged with cream colour, 

 irregularly effused, chalky, pulverulent; margin arachnoid, fugacious. 

 Hymenium concolorous, granular, or mealy under a lens. Flesh white, 

 crustaceous, thin, loose, fragile. Spores white, subtriangular, angles 

 rounded viewed laterally, in profile more or less elliptical, flattened 

 on the inner side, and swollen towards the base on the outer side, 

 4-5-6 /u,; basidia 16-25 x 4-6 /n, with 2-4 straight sterigmata, 2-3-5 p 

 long. Basal hyphae thin walled, 2-5-4/A in diam., with clamp con- 

 nections, and sometimes slightly incrusted with minute crystals. Pine 

 bark and on the ground. Sept. Nov. Rare. 



7. Hymenium consisting of more or less crowded, granular tufts, 

 seated on an arachnoid subiculum. Mould-like rather than pellicu- 

 lose, or submembranaceous. Hyphae yellowish, 6-15/i in diam., 

 branching at right angles. Basidia large, in clusters. 



*Hyphae without clamp connections. 



2300. C. vagum Berk. & Curt. (== Corticium vagum Berk. & Curt. var. 

 Solani Burt; Hypochnus Solani Prill. & Del.; Corticium Solani 

 Prill. & Del.; Corticium botryosum Bres.; Rhizoctonia Solani 

 Kiihn.) Vagum, wandering. 



R. 5-15 cm., pale olive buff to cream colour, effused, arachnoid, thin, 

 perforate membrane more or less separable. Hymenium concolorous, 

 smooth. Flesh brownish, or hyaline, arachnoid, filamentous, loose. 

 Spores white, "elliptic oblong, or navicular, flattened on one side, 

 8-14 x 4-6 /x; basidia not forming a compact hymenium, 10-20 x 

 7 '51 1//., with 4-6-sterigmata, 6 10/z long, more or less swollen 

 towards the basidium. Basal hyphae slightly brownish, hyaline 

 elsewhere, 6-10/z in diam., branches smaller, not incrusted, septate, 

 without clamp connections" Burt. Bark, wood, herbaceous plants, 

 and bare soil. Jan. Dec. Not uncommon, (v.v.) 

 C. botryosum Bres. = Corticium vagum Berk. & Curt. 



2301. C. flavescens (Bon.) Massee. (= Hypochnus fiavescens Bon.) 

 Trans. Brit. Myc. Soc. vi, text-figs, p. 318. 



Flavescens, becoming yellow. 



R. 3-10 cm., whitish to dirty buff, irregularly effused, thin, pulveru- 

 lent, with the habit of C. vagum. Hymenium concolorous, loose. Flesh 

 hyaline, or yellowish, filamentous, loose. Spores yellowish, somewhat 

 lemon-shaped, apiculate at either end, flattened on the inner side, 

 15-17 x 7-9 fji (mostly 15 x 8/z). Basidia oblong, or clavate, 20-30 x 

 12-13/it, with 2-4 curved sterigmata, 8/u, long. Basal hyphae hyaline, 

 or yellowish, septate, without clamp connections, branched at right 

 angles, loosely interwoven. Rotten wood. Feb. Uncommon, (v.v.) 



