There are two forms: A. Smell strong, pungent, p. fuscous then tan; s. becoming rusty. B. Milder, p. tawny; s. and g. yellowish.
=mixta=, Fr. P. 2-5 cm. convexo-plane, viscid, crust-colour, disc darker, rugulose; g. subdecur. crowded; s. 3-7 cm. hollow, pallid, fusco-fibrillose, rufous-scaly below; sp. 10 × 5.
=juncina=, W. G. Sm. P. 3-4 cm. hemispher. exp. even, glabrous, sulphur, disc brown; g. decur. sulphur then reddish brown; s. 8-10 cm. tapering downwards, sulphur, base tawny; sp. ----.
=decussata=, Fr. P. plane, obscurely umb. viscid, virgate with innate radiating fibrils, crust-colour; g. adnate, crowded, narrow, yellowish then tan; s. tawny.
=gummosa=, Lasch. P. 3-6 cm. plane, floccosely scaly then even, viscid, yellow or greenish; g. adnate, crowded, yellow then cinnamon; s. 4-7 cm. silky fibrillose, base reddish; sp. ----.
=spumosa=, Fr. P. 3-5 cm. exp. even, viscid, yellowish; g. adnate, yellow then rusty; s. 4-9 cm. equal, slender, fibrillose, yellowish; sp. 9 × 5.
[=Henningsii=, Bres. P. convex, exp. greenish-yellow or citrin, centre tinged fuscous, with disappearing brownish squamules; g. sinuato-adnate, crowded, yellow then tawny cinnamon; s. fibrillosely squamulose then almost glabrous, tawny-yellow; sp. 8-9 × 5.5.
[=carbonaria=, Fr. P. 3-5 cm. almost plane, even, viscid, somewhat tawny, flesh yellow; g. adnate, tan becoming fuscescent; s. 3-7 cm. rigid, squamulose, pallid; sp. 10-11 × 5-6.
III. UDI. _Cuticle of pileus continuous, not distinct or separable, glabrous_ (frequently with superficial down), _moist or slightly viscid in rainy weather. Veil evident, appendiculate._ Spores not tawny nor ochre. Allied to _Pholiota_, caespitose, growing on wood.
=fusus=, Batsch. P. 4-8 cm. compact, convexo-exp. even, rather viscid, reddish tan, flesh yellowish, veil append.; g. subdecur. yellowish then rusty; s. 4-5 cm. fibrillosely striate, base narrowed, colour of p. rooting; sp. 10 × 4.
var. _superba_, Mass. P. 8-12 cm. deep orange; s. pale orange; g. narrow, bright yellow.
=filia=, Fr. P. 4-7 cm. exp. glabrous, moist in rainy weather but not viscid, pale reddish yellow; g. adnate, arcuate, tawny yellow; s. 8-14 cm. glabrous, pale yellow, hollow; sp. 10 × 5.
[=cortinata=, D. C. Caespitose. P. convex, glabrous, discoid, veil append.; g. adnate, rusty; s. hollow, unequal, squamulose, white.