Differs from _c.l.i.to. phyllophila_ in polished stem.

[=chrysoleuca=, Fr. P. very thin, umbil. shining, white, edge reflexed, substriate; g. yellowish; s. smooth, base thickened; sp. 8-10 4.

[=ventosa=, Fr. P. infundib. glabrous, flaccid, flesh-colour, hygr.; g.

white then flesh-colour; s. colour of p.

[=dumosa=, Fr. P. very thin, plane, sub.u.mbil. rigid, deep brick-red; g.

pallid; s. glabrous, colour of p.

=detrusa=, Fr. P. 2-3 cm. rather fleshy, umbil. dark grey; g. with a decur. tooth, whitish; s. 2-3 cm. glabrous, dark grey; sp. ----.

[=umbilicata=, Fr. P. umbil. then infundib. edge reflexed, even, hygr.

tinged brown, then pale but disc darker; g. whitish; s. terete, apex striate with white fibrils; sp. 6-8 4.

=maura=, Fr. P. 2-4 cm. thin, deeply umbil. hygr. striate, sooty brown, pale and silky when dry; g. shining white; s. 3-5 cm. rigid, straight, blackish; sp. 5-6 3-4.

Differs from _Col. atrata_ in decur. narrow gills.

[=lituua=, Fr. P. thin, plane, deeply umbil. hygr. even, bay then tan; g. grey; s. slightly wavy, grey.

=offuciata=, Fr. P. 2-3 cm. plano-depr. flesh-colour then pale; g.

colour of p.; s. 4-5 cm. glabrous, reddish; sp. ----.

[=scyphoides=, Fr. Shining white. P. infundib. silky, unequal; g.

narrow; s. subvillose, short; sp. 6 2.

[=albula=, Q. P. umbil. thin, wavy, glabrous; s. solid, slender, incurved; g. adnato-decur. unequal, yellowish; sp. 10-12 long.

[=Giovanellae=, Bres. P. thin, convex and umbil. then exp. and umbil., edge striate, silky-flocculose, grey then h.o.a.ry brown; g. decur.

crowded, colour of p.; s. glabrous, colour of p.; sp. 8 3.

Differs from _Omp. scyphoides_ in h.o.a.ry-grey colour of every part.

** _Medium size; gills rather distant, narrow, narrowed at both ends._

=chrysophylla=, Fr. P. 2-4 cm. thin, umbil. flaccid, floccose, brownish yellow then paler, edge reflexed; g. deep golden yellow; s. 3-5 cm.

yellow; sp. 8 4.

Differs from _O. Postii_ in the floccose pileus.

=Postii=, Fr. P. 2-3 cm. thin, umbil. glabrous, orange; g. whitish; s.

4-6 cm. glabrous, yellow; sp. ----.

var. _aurea_, Ma.s.s. P. very regular; g. slightly decur.; sp. 7 3.5.

=vesuviana=, Brig. P. infundib. orange, edge at length wavy; g.

thickish, narrow; s. fibrillose, colour of p.

=pyxidata=, Bull. P. 1.5-2 cm. thin, infundib. rufous-red, radiately striate, pale when dry, hygr.; g. flesh-colour then yellowish; s. 1.5-2 cm. tough, pale tawny; sp. 7-8 5-6.

=leucophylla=, Fr. P. 3-4 cm. thin, quite infundib. dark grey, even; g.

shining white; s. 3-5 cm. grey; sp. 10 long.

=Luffii=, Ma.s.s. Fragrant. P. 2-3 cm. convex then depr. glabrous, pallid then white; g. crowded, decur. pallid; s. 2-3 cm. solid, pallid, polished, often wavy; sp. 5 3.

Ground among gra.s.s &c. Differs from _c.l.i.to. fragrans_ in short, polished stem.

=costatula=, Bres. P. infundib. then revolute, brown, glabrous, edge striate wavy; g. decur. straw-colour, joined by veins; s. glabrous, tinged straw-colour, base brownish; sp. 6 4.

=striaepileus=, Fr. P. 2-3 cm. plane, umbil. glabrous, entirely striate, livid brown, hygr.; g. white; s. 4-5 cm. tough, tinged brown; sp. rough, 6-7.

=Nevillae=, B. P. 1-1.5 cm. depr. rugose, disc granulated, striate, brown then pale; g. white, veined; s. 2-3 cm. brownish, rough, base downy; sp. ----.

_O. affricata_ differs in scaly p.

=sphagnicola=, B. P. 2-3 cm. thin, soon deeply umbil. squamulose, dingy ochraceous; g. dingy ochre; s. 3-4 cm. slightly flexuous, colour of p.; sp. 6 3.

=telmatiaea=, B. P. 3-7 cm. thin, pliant, soon infund. edge arched and drooping, umber, hygr. pale and silky when dry; g. pallid; s. 2-4 cm.

grey, base cottony, white; sp. 7 4.

[=affricata=, Fr. P. umbil. then infundib. not striate, edge bent down, everywhere with blackish squamules; g. grey; s. glabrous, greyish.

[=epichysia=, Pers. Soft. P. thin, exp. umbil. sooty grey, pallid when dry, silky or floccosely scaly; g. plano-decur. whitish then grey; s.

grey; sp. 8-10 4-5.

=philonitis=, Lasch. P. 1-2 cm. deeply umbil. edge erect, hygr. floccose when dry, grey; g. deeply decur. greyish; s. 3-5 cm. glabrous, grey; sp.

5-7 3.5.

Differs from _O. oniscus_ and _O. epichysium_ in erect margin of p.

[=campestris=, Rom. P. campan. umbil. then exp. sooty-fuscous, sulcate when dry; g. greyish-white, decur.; s. equal, glabrous, colour of p.

Appearing late in the season; glabrous; sp. 9-13 6-8.

=oniscus=, Fr. P. 1.5-2.5 cm. thin, infundib. wavy, flaccid, glabrous, even, grey; g. grey; s. 2-3 cm. wavy, grey; sp. 6 5.

[=oniscoides=, Karst. P. convex-umbil. sometimes reflexed and concave, glabrous, everywhere pellucidly striate, sooty or livid fuscous, pallid grey when dry; g. adnate, then subdecur. white or greyish, edge denticulate, s. tinged fuscous, base darkest; sp. 5-6 4.

=caespitosa=, Bolt. P. 1-2 cm. thin, hemisph. umbil. sulcate, whitish ochre; g. whitish; s. 1-2 cm. coloured like p., base thickened; sp. 6 5.

[=arenicola=, Fr. P. thin, cup-shaped, wavy, with wart-like spots, umber; g. paler than p.; s. short, umber.

=glaucophylla=, Fr. P. 1-1.5 cm. infundib. plicato-striate, hygr.

mouse-colour then paler; g. olive; s. stuffed, firm; sp. ----.

=rustica=, Fr. P. 5-8 mm. thin, slightly convex, umbil. striate, hygr.

greyish brown then paler and silky; g. grey, edge arcuate; s. 2-2.5 cm., colour of p.; sp. ----.

Differs from _O. umbellifera_ by gills being narrowed behind.