The Botany of Iceland - 01.12.1932, Page 105

FUNGI OF ICELAND
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rounded, at length sulcate, pellicle well developed, separable, somewhat
slimy, dark-green in the centre (f 5), 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 /c
591. R. lilacea Quélet, Flore myc. de la Fr., p. 348.
Common in birch copses everywhere in the Lagarfljót Valley [P. L.].
Pileus 3—5 cm broad, plano-convex, centre depressed, slimy and
viscid when moist, dark reddish-violet (from n 1 to n 3) in the centre,
paler towards the margin (n 7), margin at length slightly sulcate. Flesh
comparatively thick, white, taste mild. — Stipe c^dindrical or dilated
below, shaded with red in the middle, sometimes the whole stipe is
red (m 4). — Gills emarginate, crowded, at lirst pure white, then pale,
partly forked. — Spore powder almost white. Spores white, broadly
ellipsoidal, 7—8X6 /t.
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 hecoming 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 /t. — 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.
Hallormstaðir [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. cyanoxanlha, changing hetween 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 creain-coloured, then yellow. Spore powder yellow. —
Spores pale yellow, echinulate, subspherical, 7—7.5 /i in diameter.