The Botany of Iceland - 01.12.1932, Blaðsíða 100

548
POUL LARSEN
Mývatn, Glerá near Akureyri [P. L.]. — On horse-dung in meadows
near Glerá and Mvvatn.
Pileus c. 3 cm broad, at first hemispherical, then expanded, fleshy,
not hygrophanous, greyish-red (d 8), pitted, at length with cracked cuticle.
— Stipe concolorous, darker below, farinaceous above. — Gills broad,
adnate, black with white spots, margin white-fringed. — Spores black,
almond-shaped, 16—17X11 p. — Cystidia at the edge of gills at apex
clavate, swollen, up to 7.5 p broad.
The cystidia differ decidedly from those of P. campanulatus.
570. P. campanulatus (Linné) Fries, Hym. Eur., p. 311.
Agaricus panulatus Linné, Flora Suecica 2, No. 1213.
Reykjavík (Feddersen and C. H. 0.), det. E. Rostrup.
571. P. fimicola Fries, Syst. Myc. I, p. 301.
Reýkjahlíd, Skútustaðir, Laxádalur, Reykjadalur, Ljósavatn and Elliða-
vatn [P. L.]. — In homefields.
Pileus 1-4 cm broad, at first campanulate, then expanded, hygro-
phanous, veil none, dark olive-brown (c 3) when moist, light reddish-
brown when dry (between g 2 and d 7), but long retaining a dark
marginal zone. — Stipe 4—7 cm long, 2—3 mm thick, fragile, hollow,
brown below, pale and farinaceous above. — Gills crowded, ventricose,
adnate, variegated, with white margin, at length black. — Spores ellip-
soidal or somewhat almond-shaped, dark brown, smooth, 12—13X7—7.5 p.
— Cystidia at edge of gills cylindrical, somewhat dilated at base.
Psilocybe Fries.
572. P. ericaea (Persoon) Fries.
Agaricus ericaeus Persoon, Synops. meth. fung., p. 413.
Found at Reykholt by Robert and recorded in E. Rostrup’s Isl.
Svampe 1903, p. 296.
573. P. atrorufa (Schaeffer) Fries, Syst. Myc. I, p. 293.
Agaricus atrorufus Schaeffer, Fung. Ic., t. 234.
Þingvellir and Mvvatn [P. L.]. — Among grass in damp homefields.
Pileus 1—1.5 cm broad, convex, hygrophanous, not slimj', margin
striate; dark reddish-brown (j 5), when moist, pallid when dry (g 4). —
Stipe 3—4 cm long, 1—2 mm thick, pale and mealy above, dark brown
below, adpresso-fibrillose, cartilaginous, hollow. — Gills brown, broadly
adnate and slightly decurrent, crowded. — Spores ellipsoidal, brown,
8X4.5 p. — Cystidia at the edge of gills spindle-shaped, acute.
574. P. physaloides (Bulliard) Fries, Hym. Eur., p. 300.
Agaricus physaloides Bulliard, Hist. champ., t. 366, f. 1.
Seyðisfjörður [P. L.]. — Outfields and bogs.