FUNGI OF ICELAND 549 
Pileus 1—2 cm broad, campanulate, umbonate, depressed about the 
umbo, with thin flesh, reddish-brown (h 2); margin pellucidly striate, — 
Stipe short (3 cm long, 1—2 mm thick), hollow, flexuose, concolorous 
below, paler and mealy above, with a thin coating of adpressed hairs. 
— Gills at first pale, then concolorous, broadly adnate. — Spores ellip- 
soidal, smooth, brown, 8—10X5—5.5 u. — Cystidia at the edge of gills 
cylindric. 
575. P. bullacea (Bulliard) Fries, Syst. Myc. I, p. 297. 
Agaricus bullaceus Bulliard, Hist. champ, t. 566, f. 3. 
Hallormstadir [P. L.). — Among moss in bogs. 
Pileus up to 2cm broad, hemispherical, hygrophanous, striate, dark 
with brownish or reddish tinge (c 2)‘, when dry k2 to k 3, with well- 
developed veil at margin. — Stipe cylindrical, 3cm high, 2 mm thick, 
hollow, brown, covered with white scurf sometimes forming a distinct ring. 
— Gills broad, broadly adnate, purple-brown, edge white, dentate. — 
Spores ovoid with truncate apex, purple-brown, 7X4.5—5 u. — Cystidia 
at the edge of gills flexuose, hairshaped with swollen base. 
576. P. merdaria (Fries) Ricken. 
Stropharia merdaria Fries, Hym. Eur., p. 286. 
Isafjöröur and Tjörnin (Reykjavik) [P. L.]. — In homefields. 
Pileus 1.5—2 cm broad, at first hemispherical, then plano-convex, 
olive-brown (h 4 to h 8), epidermal layer viscid, margin striate, distinct 
marginal veil in young specimens. — Stipe 2—4 cm high, 2—3 mm thick, 
more or less swollen at base, hollow, concolorous, but with a frayed, 
greyish-white coating, mealy above. — Gills broad, broadly adnate, at 
first grey then purple brown with a white fringed edge. — Spores smooth, 
ellipsoidal with a germ pore, purple violet at length brown, 12—14 
X8—9 u. — Cystidia at edge of gills conical or flexuose spindle shaped, 
strongly acuminate. 
577. P. elongata (Persoon) Fries. 
Agaricus elongatus Persoon, Icones et descriptiones fungorum, t. 1, f. 4. 
Vallanes in Lagarfljöt, Grund near Akureyri [P. L.]. — Among Sphag- 
num in bogs. 
Pileus 1—2 cm broad, plano-convex, — umbonate, pale yellowish- 
white becoming olive yellow (05), centre as a rule pale reddish-brown 
(h 3), somewhat hygrophanous and with pellucidly striate margin. — Flesh 
pale, taste bitter. — Stipe cylindrical, flexuose, tough, 6—8 cm high, 
1—2 mm thick, pale yellow above, the remains of the veil forming an 
imperfect ring, reddish brown externally and internally below, shining 
when dry. — Gills at first nearly white, then purple-grey. broadly adnate 
or slightly emarginate, edge of gills denticulate under the lens. — Spores 
ovoid, pale purple, 9—12%5.5—6.5 u (some few spores up to 14%7.5 u). 
— Cystidia at the edge of gills (really the ends of hyphae from the 
trama) spindleshaped with slightly swollen apex, 35% 6—8 u, colourless 
