Part 17

=virginea=, Cke. and Mass. Persistently pure white. P. 4-5 cm. soon exp., viscid, polished when dry; g. subdecur., narrow, repeatedly forked, veined; s. 4-5 cm. solid, rugulose; sp. 4-5.

=semicrema=, Fr. P. 6-9 cm. persistently white, edge involute, even, glabrous; g. decur. crowded, white; s. 3-5 cm. white, becoming blackish; sp. 8-9.

Differs from R. adusta and R. densifolia in persistently white p.--flesh also--and g., and from R. delica in flesh of stem becoming blackish.

=lactea=, Fr. Entirely white or pallid. P. 4-5 cm. obtuse, even, unpolished then minutely cracked; g. free, thick, distant; s. 2-4 cm. solid, stout; sp. 7-9.

var. incarnata, Q. P. white tinged rose, then pale tan.

=nigricans=, Fr. P. 7-12 cm. exp. umbilicato-depr. whitish, soon sooty-olive, flesh white, reddish when broken; g. rounded, very thick and distant; s. 3-6 cm. stout, solid, pallid then black; sp. 8-9. Every part black when old.

=adusta=, Fr. P. 6-9 cm. exp. depr. white then brownish, at length scorched; g. thin, crowded, pallid; s. 3-5 cm. solid, pallid then dusky grey; sp. 8-9.

Differs from R. nigricans in much closer gills, and in flesh not changing to red.

=densifolia=, Gillet. P. 3-9 cm. convex then depr. white then brownish, flesh red when broken; g. thin, crowded, pallid; s. 3-5 cm. slightly mealy, white then grey, at length blackish; sp. 7-8.

Differs from R. adusta in flesh turning red, and from R. nigricans in crowded gills.

=delica=, Fr. White. P. 8-14 cm. exp. umbil. polished, edge incurved, even, glabrous; g. decur. thin, distant, white; s. 3-5 cm. solid, compact; sp. 8-10 x 6-7.

This species has been confounded with R. chloroides, Bres. (= R. delica, Mass. Fung. Fl. III, 53, Lact. exsuccus, Otto, &c.) but differs in polished pileus, pure white gills, &c.

=chloroides=, Bresad. (= Lact. exsuccus, Otto; Agaricus chloroides, Krombh.; Russula delica, Mass, &c. not of Cooke). P. 8-12 cm. depr. edge involute, whitish, pubescent, flesh thick, white; g. decurrent, white with a tinge of green, connected by veins, forked; s. 3-5 cm. stout, white, tomentose, sometimes with a pale green zone at apex; sp. 8-9.

Differs from R. delica in pubescent pileus and stem, and green tinted gills.

++ Pileus clear yellow.

=citrina=, Gillet. P. 4-6 cm. slightly viscid, convex then depr.; g. broadest in front, forked, white; s. 4-7 cm. white, solid, slightly rugulose; sp. 7-8.

=fingibilis=, Britz. P. 4-5 cm. exp. depr. even, slightly viscid; g. almost free, white; s. 3-5 cm. white, becoming hollow; sp. 7-9.

+++ Pileus greenish or olive.

=olivascens=, Fr. P. 5-8 cm. exp. umbil. olive disc becoming yellowish, edge even; g. white then tinged yellow; s. 2-4 cm. stout, firm, even; sp. 9-10.

=heterophylla=, Fr. P. 5-8 cm. exp. depr. even, polished, greenish, yellow-brown, &c., disc becoming ochre, flesh white; g. very narrow, closely crowded; s. 2-3 cm. solid, white; sp. 7-8.

var. galachroa, Fr. P. milky white then greenish.

Differs from R. cyanoxantha in very narrow, crowded gills.

=azurea=, Bres. P. 4-5 cm. exp. depr. pale glaucous green, with white bloom; g. pale cream colour; s. 2-3 cm. white, rugulose; sp. 8-9.

Differs from R. cyanoxantha in white meal on the pileus.

=virescens=, Fr. P. 7-12 cm. exp. umbil. dingy opaque green, innately flocculose, areolately cracked; g. rather crowded, forked; s. 4-6 cm. stout, white; sp. 8-9. Edible.

var. bicolor, C. Mart. Disc of p. yellow, edge brown; g. dark ochre.

var. purpurea, C. Mart. P. purple, disc yellow.

=furcata=, Fr. P. 6-10 cm. rigid, depr. sometimes subinfund. even, dark lurid green, even, frosted with a white silkiness; g. adnato-decur. thickish, forked; s. 4-7 cm. firm, even, white; sp. 7-8.