32 Russula. 



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. 36 cm. stout, solid, pallid then black ; sp. 89. 

 Every part black when old. 



adusta, Fr. P. 6 9 cm. exp. depr. white then brownish, at 

 length scorched ; g. thin, crowded, pallid ; s. 35 cm. solid, pallid 

 then dusky grey ; sp. 89. 



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. 35 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. 814 cm. exp. umbil. polished, edge 

 incurved, even, glabrous ; g. decur. thin, distant, white ; s. 3 5 cm. 

 solid, compact; sp. 8 10x67. 



This species has been confounded with R. chloroides, Bres. ( = R. 

 delica, Mass. Fung. Fl. in, 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. decur- 

 rent, 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. 



tf PHeiis 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. 



ttt Pileus greenish or olive. 



oliyascens, Fr. P. 58 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. 58 cm. exp. depr. even, polished, 

 greenish, yellow-brown, &c., disc becoming ochre, flesh white ; g. 

 very narrow, closely crowded ; s. 23 cm. solid, white ; sp. 7 8. 



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



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



[smaragdina, Q. P. thin, viscid, somewhat zoned, clear green, 

 edge white ; g. narrow, white ; s. slender, pruinose, white ; taste 

 mild. 



