SYSTEMATIC INDEX. 3 



Tribe 4. Pleuropus. Stem excentric or lateral. 



9696. obliquus, Fries . . . 10146 



Gen. 10. RUSSULa, Pers. 

 Veil none. Hymenophore descending unchanged into 

 the vesiculose tram a. Gills rigid, fragile, not milky, edge 

 acute. Spores rounded, often echinulate, white, or becom- 

 ing yellow. Terrestrial, fleshy, putrescent fungi, stem 

 polished, pileus at first or at length depressed. 



i. Compacts. Pileus everywhere fleshy, hence the 

 margin at first turned in, always without stria3, 

 or a distinct viscid pellicle (hence the colour not 

 variable, only changing with age or the action 

 of the air), flesh firm, compact. Stem solid, 

 fleshy. Gills unequal. 



970. nigricans, Bull. . . 1015 



971. var. albo-nigra, Krom. . 1016 



972. adusta, Pers. . 



973. densifolia, Seer. 



974. semicrema, Fries 



975. delica, Fries 

 elephantina, Fries 



976. mustelina, Fries 



ii. Furcate. Pileus compact, firm, covered with 

 a thin, closely adnate pellicle, which at length 

 disappears, margin abruptly thin, at first turned 

 in, then spreading, acute, even. Stem at first 

 compact, at length soft and spongy within. 

 Gills rather forked, mixed with a few shorter 

 ones, commonly attenuated towards each end, 

 thin and normally narrow. 



977. olivascens, Fries 



978. furcata, Pers. . 



979. var. pictipes, Che. 



980. var. ochroviridis, Cke 



981. sanguinea, Bull 



982. rosacea, Fines . 



983. maculata, Quel. 



984. sardonia, Fries . 



985. depallens, Fines 



986. purpurea, Gillet 



987. ceerulea, Pers. . 



988. driinseia, Cooke . 



in. Rigid^e. Pileus destitute of a viscid pellicle, 

 absolutely dry, rigid, the cuticle commonly 

 breaking up into flocci or granules. Flesh 



1051 

 1017 

 1067 

 1068 

 ? 



1018 



. 1035 

 . 1036 

 . 1086 

 . 1100 

 . 1019 

 . 1020 

 . 1069 

 . 1037 

 . 1021 

 . 1022 

 . 1052 

 . 1023 



