Scattered to gregarious among needles under
coastal scrub of Juniperus communis. Occasionally solitarily on
small Juniperus twigs. Also recorded from alpine Salix scrub. Late autumn. Rare or possibly overlooked. So far only recorded from Greenland and Norway.
Pileus 6-12(-21) mm across,
cylindrical or more or less hemispherical when young, then
conical or obtusely conical to parabolical, occasionally
with a small umbo; translucent-striate, sulcate, dry, glabrous;
pale yellow to greenish yellow or olivaceous with almost
no yellow components, or olivaceous centre with paler, yellowish
margin; drying to pale yellow all over. Lamellae
12-19 reaching the stipe, ascending, narrowly adnate, occasionally
with a short decurrent tooth, becoming slightly intervenose
with age; yellowish to cream coloured or pale grey to white,
with the edge concolorous. Stipe
50-65 x 1-1.5 mm, straight to somewhat flexuous, often
curved towards the base, firm, terete, equal, glabrous except
for the pruinose apex; the apex whitish or pale grey, darker
grey to brownish below, occasionally with a yellow component;
the base densely covered with long, coarse, flexuous, whitish
fibrils. Odour not distinct. Taste
not recorded.
Basidia
30-36 x 6.5-8 µm, clavate, 2-spored, more rarely 1-spored, with sterigmata 8-9 µm
long. Spores 8.5-11.2 x 6.2-8.2 µm,
Q 1.2-1.6, Qav ~ 1.4, smooth, broadly pip-shaped, amyloid. Cheilocystidia
15-40 x 6.5-17 µm, forming a sterile band, clavate, covered
with unevenly spaced, fairly coarse, simple, cylindrical,
straight to curved excrescences 1.5-8(-20) x 0.9-2 µm.
Pleurocystidia absent. Lamellar
trama vinescent in Melzer's reagent. Hyphae
of the pileipellis 2.5-3.5 µm wide,
densely covered with simple to furcate,
cylindrical excrescences 2-4.5 x 0.5-1 µm, somewhat
gelatinized. Hyphae
of the cortical layer of the stipe 1-2.5
µm wide, covered with simple, cylindrical
excrescences 1-6.5 x 0.9-1.3 µm. Clamps absent, or with some +/- abortive clamps.
Microphoto of cheilocystidia
Microphotos of cheilocystidia and hyphae of the pileipellis
Mycena citrinovirens was originally
described from Greenland in 1955. It has been found regularly
in two Norwegian localities since 1988 (Aronsen
1994). Maas Geesteranus (1991) placed it in sect.
Mycena, where it seems to have a somewhat aberrant
position. In some features it shows a closer relation to sect. Filipedes. It can be distinguished from the other members
of section Mycena on account of the small size, the yellowish
colours in the pileus, and the typical growth on Juniperus
needles. In the field it may be confused with Mycena
citrinomarginata, but that species can easily
be distinguished because of completely different cheilocystidia.
The holotype of M. citrinovirens is devoid of clamps but the Norwegian collections have some clamps in all tissues, of which many are +/- abortive.
The Norwegian collections generally are fairly small, with a pileus less than 10 mm, but one collection from 2006 had a pileus measuring up to 21 mm across.
Go
to key to sect. Mycena
See
Mycena citrinovirens paper. |