RUSSULA 459 



1501. R. adusta (Pers.) Fr. (= Russula albo-nigra Krombh. sec. Quel.) 

 Cke. Illus. no. 972, t. 1051. Adusta, scorched. 



P. 8-15 cm., pallid, or whitish, becoming cinereous-fuliginous, con- 

 vex, then depressed, and somewhat infundibuliform. St. 3-5 x 2- 

 3 cm., concolorous, obese. Gills white, then dingy, adnate, then de- 

 current, thin, crowded, narrow. Flesh white, then brownish, and finally 

 black. Spores white, globose, 8/z, verrucose. Cystidia "sparse, subu- 

 late, 45-50 x 7/i" Rick. Taste mild. Woods. Aug. Nov. Com- 

 mon, (v.v.) 

 var. caerulescens Fr. Caerulescens, becoming blue. 



Differs from the type in the flesh becoming dark blue when cut or 

 broken. Deciduous woods. Rare, (v.v.) 

 var. albo-nigra (Krombh.) Fr. Cke. Illus. no. 971, t. 1016. 



Albus, white; nigra, black. 



Differs from the type in the white pileus becoming smoky near the 

 margin, the stem fuscous from the first, and the flesh immediately be- 

 coming black when broken. Cystidia "only on the edge of the gill, 

 subulate-pointed, 75-90 x 9-10/x, filled with dark juice" Rick. 

 Woods. Aug. Oct. Uncommon, (v.v.) 



1502. R. densifolia (Seer.) Gill. Cke. Illus. no. 973, t. 1017. 



Densus, crowded ; folium, leaf. 



P. 7-10 cm., whitish, then dingy brown, and finally black, convex, 

 then depressed, slightly viscid at first; margin elastic, villose, white. 

 St. 3-5 x 1-2 cm., white, then concolorous, equal, pruinose. Gills 

 white, becoming grey when touched, then dingy, and finally black, adnate, 

 decurrent by a tooth, narrow, crowded, thin. Flesh white, becoming red 

 when broken, and finally black. Spores white, globose, 7-8/z, echinu- 

 late, 1-guttulate. Smell pleasant, taste slowly acrid. Woods. Aug. 

 Oct. Not uncommon, (v.v.) 



1503. R. semicrema Fr. FT. Icon. t. 172, fig. 1. 



Semi,hali; crema, burnt. 



P. 6-11 cm., persistently white, convex then plane, disc umbilicate. 

 St. 5-8 x 5-6 cm., white, becoming black, firm. Gills persistently white, 

 decurrent, crowded, thin. Flesh of pileus persistently white, becoming 

 black in the stem. Spores white, globose, 8-9/1,, verruculose. Taste 

 mild. Woods. Aug. Sept. Rare. 



II. Pellicle of the pileus dry, adnate, rarely possessing cystidia, 

 usually breaking up into fiocci, granules, or areolae. Margin 

 rounded, never striate (except 1511), or involute. Gills with a very 

 broad, rounded apex. Spores whitish cream-colour in mass. 



1504. R. lactea (Pers.) Fr. Lactea, milk-white. 

 P. 5-12 cm., milk-white, then tan-white, convex, then plane, often 



excentric, pruinose, appearing as if stippled under a lens, then 



