52 FUNGUS-FLOEA. 



age. Known from B. aditsta by the flesh becoming reddish 

 when broken, and by the much thicker, and more distant 

 gills. B. densifolia agrees with the present species in 

 becoming red when cut, but differs in the thin, rather 

 crowded gills. 



Russula adusta. Fr. 



Mild. Pileus 3-4 in. across, flesh thick up to the margin, 

 firm; soon expanded and more or less depressed, margin 

 incurved at first then straight or upturned, even, glabrous, 

 white then brownish, finally with a scorched appearance ; 

 gills adnate then slightly decurrent, thin, crowded, unequal, 

 pallid; stem 1J-2 in. long, up to f in. thick, pallid then 

 sooty-grey, solid ; spores subglobose, almost smooth, 89 //. ; 

 no cystidia. 



Eussula adusta, Fries, Epicr., p. 350 ; Cke., Hdbk., p. 320 ; 

 Cke., Illustr., pi. 1051. 

 In woods. 



Can only be confounded with R. nigricans, from which it 

 is abundantly distinct ; size usually smaller ; flesh juiceless r 

 not becoming reddish, pileus at length infundibuliform * 

 gills decurrent, thinner, crowded. Colour pallid or whitish 

 when young, appearing scorched and sooty-grey when old ; 

 gills white then dingy, not becoming red when bruised. 

 (Fries.) 



Fries mentions a variety which is scarcely different from 

 the typical form, except in the flesh becoming blue when 

 broken or cut. This is B. adusta coerulescens (Fr.), not yet 

 recorded for Britain. 



B. densifolia, a species not recognised by Fries, differs 

 from the present species in the flesh and gills becoming 

 red when wounded. B. semicrema agrees in the stem turning 

 black, but the pileus is persistently white. 



Far. albo-nigra; Bussula albo-nigra, Fries, Hyrn. Eur., 

 p. 440; Bussula nigricans, var. albo-nigra, Cke., Hdbk., p. 

 320; Cke., Illustr., pi. 1016; Agaricus albo-niger, Krombh., 

 p. 27, t. 70, f. 16-17. 



Pileus about 2 in. across, flesh rather thick, firm, 

 white, turning blackish when bruised ; convex then ex- ; 

 panded, at length infundibuliform, whitish or pallid, smoky 

 at the incurved margin; gills slightly decurrent, thin, 



