=rotula=, Fr. P. 4-7 mm. umbilicate, plicate, whitish or disc slightly tinged; g. attached to a free collar encircling the stem; s. 2-4 cm. glabrous, blackish, shining; sp. 6 x 3-4. [=littoralis=, Q. P. umbil. plicate, white; g. free, distant; s. horny, umber, apex pale, base downy. =graminum=, Berk. P. up to 1 cm. umb. striate or sulcate, pale rufous, disc darker; g. attached to a collar encircling stem, few in number; s. 2-4 cm. black, shining, glabrous, apex paler; sp. subgl. 3-4. [=epodius=, Bres. P. convexo-campan. exp. usually umb. and depr. edge at first incurved, sulcate, centre usually reticulated, reddish-yellow then pale; g. free, white then yellowish; s. very glabrous, rufescent then bay, apex hyaline, base bulbillose substrigose; sp. 20-28 x 2.5-4. [=Menieri=, Boud. P. 1-3 mm. excentric, broadly subumb. punctulate tawny; g. fold-like, few, branched, paler than p.; s. curved, tawny, base black; sp. 18-25 x 5-7. [=faveolaris=, Fr. P. sulcate, exp. disc coloured; g. attached to a ring, anastomosing to form cells; s. glabrous, subulate, bay below. =androsaceus=, Fr. P. 1-1.5 cm. whitish, umbilicate striate; g. adnate to stem; s. 3-6 cm. black, glabrous, polished; sp. 7 x 3-4. [=sclerotipes=, Bres. P. thin, convex, edge incurved then plane, ruguloso-striate, shining white, umbil. yellowish, subflocculose; g. distant, adnate, white, edge fimbriate; s. filiform, tinged rufescent downwards, adnate to a rufescent sclerotium. Passed as _Collybia cirrhata_ very frequently. The latter differs in not springing from a sclerotium. _Collybia tuberosa_ differs in growing on fungi. [=Bulliardi=, Q. P. plicate, dingy yellow brown; g. whitish; s. bay. =splachnoides=, Fr. Inodorous. P. up to 1 cm. whitish, subumbilicate, striate; g. subdecurrent; s. 2-4 cm. polished, reddish-brown; sp. 8 x 5. Similar in habit to _M. perforans_, but no smell, and white subdecurrent gills. [=limosus=, Q. Very minute. P. plicate, diaphanous, whitish; s. capillary, brownish. =flosculus=, Q. P. white, umbil. sulcate; g. adnate, white; s. short, incurved, bay, apex pale. =Curreyi=, B. & Br. P. up to 1 cm. pale rufous, coarsely striate, umb. tawny; g. attached to collar; s. 2-3 cm. polished, blackish, apex white; sp. 9 x 5-6. ** _Stem velvety or pilose._ =perforans=, Fr. Foetid. P. up to 1 cm. whitish or tinged rufous, plane, not striate, rugulose; g. adnate; s. 2-3 cm. minutely velvety, blackish brown; sp. 4 x 3. =insititius=, Fr. Inodorous. P. 1-1.5 cm. subumbilicate, at length plicate, pale yellow-brown then whitish; g. broadly adnate, simple, unequal, distant; s. 2-3 cm. floccose or scurfy, reddish-brown; sp. 4 x 2.5. =Hudsoni=, Pers. P. 2-3 mm. rugulose, tinged brown, covered with spreading purplish hairs; g. white; s. 1-1.5 cm. with hairs like the pileus; sp. 5 x 3. [=buxi=, Fr. P. sulcate, minutely squamulose, tawny; g. few; s. blackish purple, pilose below, glabrous above.