var. _Keithii_, Phil. and Plowr. P. rufous grey; s. dingy white, tinged red near base. =murinaceum=, Bull. Smell strong. P. 5-10 cm. exp. sometimes subumb. grey, silky, cracking into squamules; g. deeply sinuate, broad, grey; s. grey with darker squamules; sp. ----. [=bisontinum=, Roll. P. pulvinate, cuticle thick, brown with greenish tinge, virgate with minute adpr. fibrils; g. thick, grey, with flat, transverse, more or less branched veins; s. solid, narrowed below, fibrillosely striate, with minute dark granules above, pale; 10-12 x 6. =hordum=, F. P. exp. subumb. grey, dry, glabrous then breaking up into squarrose scales; g. rather distant, becoming greyish; s. 6-8 cm. whitish, glabrous; sp. =virgatum=, Fr. P. rigid, 5-9 cm. exp. umb. very dry, greyish, virgate with radiating blackish lines; umb. often broken up into squamules; g. broadly emarginate, becoming greyish, crowded; s. 7-9 cm. striate, glabrous, whitish; sp. 6-8 x 5-6. The only dry sp. with a virgate pileus. [=dissultans=, Karst. P. fragile, thin, convexo-plane, acutely umb. very dry, hoary with dense subreticulately interwoven superficial fibrils, grey; g. hoary; s. hollow, equal, white, loosely fibrillose, apex pruinose; sp. 5-6 x 4. [=elytroides=, Scop. P. exp. obt. scabrid, disc floccosely scurfy, grey; g. broad, grey; s. with dense fibrils directed upwards. [=opicum=, Fr. P. umb. even, soon squamulose, greyish as is also the flesh; g. arcuato-adfixed, hoary; s. stuffed, equal, almost glabrous. IV. SERICELLA. _Pileus at first silky, soon glabrous, quite dry._ * _Gills broad, thickish, rather distant._ =sulphureum=, Fr. Strong smelling. Entirely sulphur yellow or p. tinged rufous. P. 3-8 cm. subumb. silky, even; g. distant; s. 5-10 cm. striate, same colour inside; sp. 9-10 x 5. =bufonium=, Pers. P. 3-7 cm. soon plane, subumb. silky, soon glabrous, rugulose, opaque, purplish brown, umber, or tan; g. yellowish-tan then pallid; s. 5-7 cm. flocculose, coloured like p.; sp. subgl. 4-5. =lascivum=, Fr. Smell strong. P. 4-5 cm. exp. and subdepressed, even, silky then glabrous, tan colour then pallid; g. arcuately adnexed, crowded, white; s. 4-6 cm. solid, rigid, tomentose, whitish, apex mealy, rooting; sp. 8-10 x 4-5. var. _robustum_, Cke. Robust. P. whitish, silky; smell weak or none. =interveniens=, Karst. P. convexo-plane, depr. silky then glabrous, rugulose near edge, tan then pale; g. arcuato-adnex. crowded, pallid; s. solid, equal, rooting, fibrillose, pallid; sp. 6-7 x 2-2.5. =inamoenum=, Fr. Foetid. White. P. 2-4 cm. exp. umb. silky then glabrous, even; g. arcuato-adnexed, crowded; s. 7-10 cm. equal, solid, rooting; sp. 9-10 x 6-7. The only white, foetid _Tricholoma_. ** _Gills thin, crowded, narrow._ =cerinum=, Pers. P. 2-4 cm. exp. obtuse or depressed, even, dry, almost glabrous, wax-yellow or brown; g. crowded, yellow; s. 2-3 cm. stuffed, fibrillosely striate, yellowish, base darker; sp. ----.