FUNGI OF ICELAND 553 
rounded, at length sulcate, pellicle well developed, separable, somewhat 
slimy, dark-green in the centre (f5), somewhat paler at the margin (i 7). 
Flesh white, palatable. — Stipe subcylindrical or attenuated at the base, 
white with low ridges and veins, at length with brown spots. — Gills 
cream-coloured, emarginate-adnate, edge denticulate. — Spore powder 
cream-coloured, spores echinulate, oblong, 7—8X6 u. 
591. R. lilacea Quélet, Flore myc. de la Fr., p. 348. 
Common in birch copses everywhere in the Lagarfljöt Valley [P. L.). 
Pileus 3—5 cm broad, plano-convex, centre depressed, slimy and 
viscid when moist, dark reddish-violet (from n1 to n3) in the centre, 
paler towards the margin (n 7), margin at length slightly sulcate. Flesh 
comparatively thick, white, taste mild. — Stipe cylindrical or dilated 
below, shaded with red in the middle, sometimes the whole stipe is 
red (m 4). — Gills emarginate, crowded, at first pure white, then pale, 
partly forked. — Spore powder almost white. Spores white, broadly 
ellipsoidal, 7—8X6 u. 
592. R. vinosa Quélet, Flore myc. de la Fr., p. 348. 
In birch copses and among grass both in the valleys and in moun- 
tain pastures. Common in the west-, north- and east-country [P. L.]. 
Pileus 4—6 cm broad, plano-convex, at length with depressed centre, 
slimy, viscid, margin at length sulcate. Dark red in the centre (d 1), 
margin vinous red (d 4). Flesh white, but red below the pellicle, turning 
grey and soft, taste mild. — Stipe cylindrical, with a somewhat dilated 
but acuminate base, white, mealy and sulcate, firm, but becoming grey 
and soft. — Gills white with a yellowish tinge, becoming grey, equal, 
branched at the stipe, brittle, adnate. — Spore powder pale. Spores white, 
echinulate, 8—9X7—8 u. — Cystidia at the edge of the gills lanceolate, 
apex pointed, contents granular. 
Note. Though this Russula is very similar to R. depallens (Pers.) Fries, 
still it differs so much from it in several respects that it must be con- 
sidered correct to regard it as a distinct species. Among the differences 
I may point out its geographical distribution, which does not coincide 
with that of R. depallens. Thus the latter species or form has not been 
observed in Iceland. 
593. R. grisea (Persoon) Bresadola, Iconographia mycologica, Tab. 452. 
Hallormstadir [P.L.). — In birch copses. 
Pileus 7—8 cm broad, convex, centre depressed, margin at length 
sulcate, well developed with a thin pellicle, viscid and slimy when moist, 
resembling in colour R. cyanoxantha, changing between olive-green, purple, 
and ochre. Flesh white, but with a lilac tinge below the pellicle, taste 
mild. — Stipe almost equal, though sometimes dilated at base, white, 
finely rugose-sulcate. — Gills broadest in front, narrowly adnate, forked 
at the stipe, at first cream-coloured, then yellow. Spore powder yellow. — 
Spores pale yellow, echinulate, subspherical, 7—7.5 u in diameter. 
