Chapter III: RIGIDA. Pellicle rigid, punctato-granulate, or broken up into

glabrous fragments when dry._

* _Gills white or pallid, not rufous or grey spotted._

=macrorhizum=, Lasch. Smell strong. P. 10-20 cm. exp. ochraceous, darker and cracked when old; g. almost free; s. 5-10 cm. stout, ochraceous, rooting, solid, ventricose; sp. subgl. 5-6.

[=compactum=, Fr. P. soon plane, even, dry, glabrous, livid grey, compact; g. yellow; s. solid, white.

=saponaceum=, Fr. Smell strong. P. exp. obtuse, dry, livid, tinged olive, glabrous then often squamulose or punctate, flesh reddish; g. pallid with greenish tinge; s. 5-10 cm. whitish, somewhat rooting; sp. 5 x 4.

var. _atrovirens_, P. thin, wavy, obscure green with crowded black squamules.

[=Boudieri=, Barla. P. exp. even, dry, satiny maroon or vinous with coppery tint, then sooty brown with deeper granules at centre; g. tinged green then ochre; s. subcylindrical, rather unequal, fibrillose, whitish tinged red, then brownish-fawn; flesh white then reddish.

Differs from _Trich. saponaceum_ in the copper coloured p.

[=miculatum=, Fr. P. exp. obtuse, glabrous, granulated then cracked, umber; g. subadnate; s. solid, fibrillosely floccose.

=cartilagineum=, Bull. P. 5-9 cm. soon exp. and wavy, margin persistently incurved, blackish, then broken up into small black spots; g. crowded then greyish; s. 3-5 cm. glabrous, pure white; sp. ----.

=tenuiceps=, Cke. and Mass. P. 5-8 cm., flesh very thin, obtuse, dry, granular, dusky brown; g. narrowed in front, white; st. 5-8 cm. ochraceous white, everywhere granular, base abrupt with cord-like mycelium; sp. subgl. 6-7.

=loricatum=, Fr. Smell strong. P. 2-5 cm. tough, convex, wavy, rather viscid, brown, cuticle thick, tough, separable; g. almost free, pallid; s. 5-7 cm. tough, often twisted, brownish red; sp. ----.

=atrocinereum=, Pers. P. 3-5 cm. soon plane, grey, prominent disc darker, often cracked; g. crowded, hyaline; s. 5-7 cm. cylindrical, stuffed, glabrous, apex naked, whitish; sp. ----.

=cuneifolium=, Fr. Smell strong. P. 1.5-2.5 cm. soon plane, dry, brown, glabrous then squamulose; g. crowded, white, broad and obliquely truncate in front; s. 2.5 cm. hollow, narrowed at base, pallid, apex mealy; sp. subgl. 3-5.

Differs from _T. atrocinereum_ in hollow stem.

** _Gills discoloured, with rufous or grey, spotted._

=crassifolium=, Berk. Smell strong. P. 5-10 cm. exp. wavy, flesh thin, umb. ochraceous, disc darker; g. nearly free, becoming yellowish, thick; s. solid, paler than p., pruinose; sp. ----.

[=geminum=, Fr. Stout, compact. P. obtuse, rufous cinnamon, velvety then rimose; g. crowded; s. solid, floccose.

=sudum=, Fr. P. 6-9 cm. soon plane, dry, greyish brown, glabrous, disc often squamulose; g. deeply emarginate, white then tinged rufous; s. 6-8 cm. solid, pallid, fibrillosely-squamulose, striate; sp. 6-7 x 3.5.

=tumidum=, P. Smell slight. P. 6-8 cm. bullate, deformed then exp. and wavy, livid grey, spotted, somewhat shining, cracking; g. white then grey with rufous tinge; s. 7-9 cm. stout, tumid, striate, white, rooting; sp. 6 x 4.

var. _Keithii_, Phil. and Plowr. P. rufous grey; s. dingy white, tinged red near base.

=murinaceum=, Bull. Smell strong. P. 5-10 cm. exp. sometimes subumb. grey, silky, cracking into squamules; g. deeply sinuate, broad, grey; s. grey with darker squamules; sp. ----.

[=bisontinum=, Roll. P. pulvinate, cuticle thick, brown with greenish tinge, virgate with minute adpr. fibrils; g. thick, grey, with flat, transverse, more or less branched veins; s. solid, narrowed below, fibrillosely striate, with minute dark granules above, pale; 10-12 x 6.

=hordum=, F. P. exp. subumb. grey, dry, glabrous then breaking up into squarrose scales; g. rather distant, becoming greyish; s. 6-8 cm. whitish, glabrous; sp.

=virgatum=, Fr. P. rigid, 5-9 cm. exp. umb. very dry, greyish, virgate with radiating blackish lines; umb. often broken up into squamules; g. broadly emarginate, becoming greyish, crowded; s. 7-9 cm. striate, glabrous, whitish; sp. 6-8 x 5-6.

The only dry sp. with a virgate pileus.

[=dissultans=, Karst. P. fragile, thin, convexo-plane, acutely umb. very dry, hoary with dense subreticulately interwoven superficial fibrils, grey; g. hoary; s. hollow, equal, white, loosely fibrillose, apex pruinose; sp. 5-6 x 4.

[=elytroides=, Scop. P. exp. obt. scabrid, disc floccosely scurfy, grey; g. broad, grey; s. with dense fibrils directed upwards.

[=opicum=, Fr. P. umb. even, soon squamulose, greyish as is also the flesh; g. arcuato-adfixed, hoary; s. stuffed, equal, almost glabrous.