=iris=, Massee. P. 2-3 cm. hemispher. then exp. acutely umb. pale brown-ochre, silky, white-fibrillose; g. much cut out behind, orange-brown, edge entire; s. 5-7 cm. conical, solid, orange-brown and squamulose below ring, smooth and violet at first above ring; sp. 10 x 5. VI. HYDROCYBE. _Pileus glabrous or covered with superficial white fibrils, not viscid but moist when growing, discoloured when dry; flesh very thin, splitting, disc rarely compact. Stem rather rigid, not peronate; veil thin, fibrillose, rarely collapsing and forming an irreg. zone._ * FIRMIORES. _Pileus rather fleshy, convex then campan.-convex, expanded, obtuse or at length gibbous, edge at first incurved. Stem generally narrowed upwards._ (Colour when dry given in brackets.) + _Stem and veil white._ =firmus=, Fr. P. 6-7 cm. exp. obtuse, glabrous, rusty ochre, flesh compact, white; g. crowded; s. 6-8 cm. solid, stout, rather bulbous, white, veil rusty; sp. ----. Differs from _C. subferrugineus_ by clear colour of p. and white s. =subferrugineus=, Fr. P. 5-7 cm. exp. yellowish brick-red becoming rusty, subhygr.; g. scarcely crowded, broad, opaque, rusty; s. 6-8 cm. solid, spongy, rigid outside, subbulbous, white then dingy; sp. 8-10 x 5-6. =armeniacus=, Fr. P. 4-9 cm. exp. gibbous, glabrous, tawny cinnamon (yellowish tan), shining; g. adnate, crowded; s. 5-7 cm. conical, rigid, subperonate, white; sp. 8-9 x 5. var. _falsarius_, Fr. P. yellow, white when dry. [=umbilicatus=, Karst. P. convexo-plane, minutely umbil. undulate, obtuse, even, glabrous, brown-bay; g. very broad, cinnamon; s. equal, base thickened, whitish; sp. 6-6.5 x 4-4.5. =damascenus=, Fr. P. 5-7 cm. thin, exp. bay-cinnamon (brick-red, rivulose); g. adnate, crowded; s. 5-7 cm. solid, firm, cylindrical, whitish; 12 x 6. =privignus=, Fr. P. 4-5 cm. exp. gibbous, glabrous, pallid fuscous, silvery-hoary (tan then pallid); g. adnate, serrate; s. 6-7 cm. fragile, silvery white; sp. 8 x 5. =duracinus=, Fr. P. 3-6 cm. rigid, exp. gibbous, watery brick-red (tan, opaque), edge strongly incurved, silky; g. adnate, thin; s. 3-5 cm. rigid, unequal, rooting, glabrous, white; sp. 5 x 3. [=candelaris=, Fr. P. conico-campan. obtuse, glabrous, reddish dun (tawny, shining) edge slightly incurved white-silky; g. adnato-decur.; s. rigid, yellowish white, rooting. =illuminus=, Fr. P. 3-7 cm. exp. gibbous, glabrous, tawny brick-red (brick-red, tan) edge thin; g. adnate; s. 5-9 cm. partly hollow, pallid becoming rusty; sp. 11-12 x 6-7. =tortuosus=, Fr. P. 3-5 cm. exp. glabrous, even, shining, rusty bay (brick-red); g. adnate, tawny blood-red or purplish when touched; s. somewhat twisted, silvery; sp. 15-16 x 8. =dilutus=, Fr. P. 4-5 cm. exp. subumb. glabrous, even, opaque, reddish dun (tan); g. broad, crowded; s. 4-7 cm. soft, pallid, base thickened; sp. 6 x 4.