=acerosus=, Fr. P. 2-3 cm. very thin, reniform, plane, striate, sublobed, grey, silky white when dry; g. narrow, crowded, grey; s. obsolete, base substrigose; sp. glob. 5-6. [=Severinii=, Com. Shining white. Velvety then almost glabrous, orbicular, edge entire, incurved; g. decur. simple; s. short, incurved. C. RESUPINATI. _Pileus at first resupinate; gills radiating from an excentric point; then reflexed, sessile._ * _Pileus fleshy, uniform in texture._ =porrigens=, Pers. White. P. 4-7 cm. thin, tough, resup. then ascending, ear- or fan-shaped, glabrous upwards; g. very narrow; sp. 7-8 x 6. Resembling _P. petaloides_ in habit but white, and no stem-like base. [=pinsitus=, Fr. P. fleshy, soft, horizontal, silky-villose, wavy, hygr. dingy then white; g. broad, distinct; sp. rough, 10-11 long. [=nidulans=, Pers. P. subreniform, tomentose, yellow; g. broad, tawny-orange; sp. 3-5 x 1. [=caesiozonatus=, Rab. P. subsessile, tough, plane then depr. behind, downy, ochre-brown, zoned with bluish grey; g. broad, brownish yellow. =septicus=, Fr. P. 1-2 cm. rather fleshy, resup. then reflexed, pubescent, white; s. thin, 2-3 mm. incurved, disappearing; g. distant; sp. 8-10 x 6. _Claudopus variabilis_ differs in tinted gills and spores. [=roseolus=, Q. P. convex, conchoid, translucent, striate, rather woolly, rosy-purple; g. rosy, edge darker; s. curved, downy, colour of p.; sp. 8. ** _Pileus fleshy, striate, upper surface gelatinous, or with a viscid pellicle._ =mastrucatus=, Fr. P. 4-5 cm. resup. then exp. and horizontal, often lobed, brown, with erect bristly squamules; g. broad, greyish white; sp. ----. [=rivulorum=, Pat. and Doas. P. subgelatinous, pellucid, rusty brown and covered with white down, horizontal or ascending; g. grey then vinous; s. lateral, tubercular, downy, white, rosy when touched; sp. 4-6. [=tremens=, Q. P. reniform or flabellate, diaphanous, rosy-violet, tremelloid; g. sinuate, pinkish; s. lateral, colour of p.; sp. rough, 6-7. =atrocoeruleus=, Fr. P. 2-5 cm. fleshy, downy, dusky blue; g. broad, whitish; sp. glob. 2-3. P. sometimes brownish, and g. sometimes yellowish. [=myxotrichus=, Lev. P. reniform, at first viscid, becoming spongy, covered with white down, sessile or with a short stem; g. rather broad, crowded; sp. 10-12 long. [=furvellus=, Karst. P. dusky or bluish rosy, yellowish-white then brownish when old; sp. 6-9 x 4-5. Allied to _P. unguicularis_ but larger and becoming pale. =Leightoni=, B. P. 1-1.5 cm. at first obliquely conical then shell-shaped, umber or lead-colour, scurfy and with short black bristles; g. distant, tan, forked at base; sp. ----. =algidus=, Fr. P. 2-3 cm. horizontal, reniform, pellicle thin, viscid, reddish-brown or grey; g. crowded, yellowish. =fluxilis=, Fr. P. reniform, gelatinoso-viscid above, umber; g. radiating from a lateral point, distant, whitish; sp. 10 long.