Agrocybe arvalis (Fr.) Heim & Romagn.

Diagnosis fuente: http://FUNGI OF SWITZERLAND 4 - Agarics 2nd partJ. Breitenbach/F. Kränzlin - Edition Mykologia Lucerne

Agrocybe arvalis i I
(Fr.) Sing.
= Agrocybe tuberosa (Henn.) Sing.
= Naucoria temulenta (Fr.) Kumm. ss. Rick,
Habitat
Solitary to gregarious in meadows, pastures, fields, gardens,
parks, on Gompost heaps or humus-rich soil, Summer-fall. Rare.
Distribution: E, As.
Macroscopic features
Pileus 10-30 (45) mm across, hemispherical to conical when young,
later convex, plane with a somewhat indented center when
old, surface hygrophanous, dark ocher-brown and butyraceous
when moist, beige and dull when dry, sometimes slightly wrinkled,
margin Inrolled for a long time, later acute. Flesh whitish, thin, almost
odorless, taste bitterish with a farinaceous component. Lamellae
pale beige when young, later tobacco- to reddish-brown,
broad, L = 30-35, | = 3-7 (11), ascending and +/- finely adnexed,
edges pale-ciliate. Stipe 40-70 (100) x 2-4 mm, cylindrical, without
an annulus, elastic, hollow, surface whitish to beige, entire length
whitish-pruinose to slightly longitudinally fibrillose, base with white
rhizoids and attached to a subglobose scerotium which is blackish
on the outside and white within and buried in the ground.
MioenoPe features
Fam. Bolbitiaceae
Sing.
Spores elliptical, smooth, thick-walled, pale honey-brown, with a small
germ pore up to ca. 1 ym across, 8,6-11 x 4.6-5.8 im; Q: 1,7-2.0; Vm:
142; spp. tobacco-brown.
B; paced cylindrical, 25-30 x 6-7 pm, with 4 sterigmata, some with a basal
clamp.
C: (C1) Cheilocystidia lageniform to subulate, 35-55 x 6-15 jim; (C2) pleurocystidia
ventricose, with 3-5 digitiform outgrowths apically, 80 x
15-20 ym paclonia the outgrowths),
D: Pp hymeniform, composed of clavate to vesicular cells 10-25 x 8-15 um,
interspersed with occasional lageniform to fusiform pileocystidia, no
clamps seen.
E: Caulocystidia cylindrical, obtusely subulate,
Remarks
This species Is easy to identify as.long as the frb, is carefully dug up and the
sclerotium can be found, since it is the only species in the genus which has a
solerotium, It |s also distinctive microscopically because of its unusual pleurocystidia
with digitiform outgrowths, oh edie palucosa (No. 367) can occur
in similar habitats, It is very similar in habitus, but itis annulate and can be sepersied
with certainty from A. arvalis by the absence of the above-mentioned
atures.
Collection examined and illustrated
Unterageri ZG (Hurital-Brand), elev, 1120 m, See 2168, at the edge of a forest
under Salix, in grass, Sept. 9, 1983, coll. Schwegler J., 0909-83 Schw 1.
Other collections: quad, 1864. — Imbach: not included.

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