Typically on fallen, decaying leaves of
Quercus. Autumn. See The
Norwegian Mycological Database.
Pileus 1-5 mm
across, hemispherical to parabolical, becoming plano-convex, often with somewhat
flattened centre, or sometimes with a small umbo, sulcate,
translucent-striate, pruinose, glabrescent, pale pink, pinkish-apricot
to brownish-pink, often darker at the centre, with age often
paler to whitish pink. Lamellae
5-13 reaching the stipe, ascending to subhorizontal, fairly
broad, narrowly to broadly adnate, sometimes decurrent with
a short tooth, pink to pinkish-white, the edge convex, white.
Stipe 5-15(-40) x 0.1-0.4 mm,
straight to curved, equal, pruinose, glabrescent except
for the base, the base somewhat bulbous, fairly dark grey
at the apex in younger stages and grey below, becoming watery
grey to watery white, insitituous or sometimes attached with a whorl of very thin, radiating fibrils. Odour
19-25 x 6-9 µm, slender-clavate, 2-spored, with
sterigmata up to 8 µm long. Spores
10-12.5 x 3.8-5 µm, Q = 1.9-2.5, Qav ~ 2.1, elongated pip-shaped to somewhat
cylindrical, amyloid. Cheilocystidia
14-29 x 6-16 µm, forming a sterile band, clavate to
obpyriform, covered with fairly numerous, evenly
spaced, cylindrical excrescences 1-5 µm long.
Pleurocystidia absent. Lamellar trama dextrinoid, vinescent in Melzer’s reagent. Hyphae
of the pileipellis 3.5-12 µm wide,
densely covered with warts, terminal cells up to 52 x 14 µm, inflated.
Hyphae of the cortical layer of the stipe
clavate to subglobose, diverticulate. Clamp connections absent.
According to Maas Geesteranus (1986a: 178)
Mycena smithiana has 2-spored basidia without clamp
connections. Similar-looking specimens found on fallen leaves of Betula in mountain birch forest and on fallen leaves of Salix in alpine areas have been associated with this species. They differ in having 4-spored basidia and possibly in other features. These taxa are in great need of further study. Aronsen & Gulden (2007) proposed the new species M. exilis based on material growing on fallen Salix leaves in alpine areas.
M. smithiana is a member of sect.
Singer ex Maas Geest. where it can be identified on account
of the pink colour that always is present, the fairly broad
lamellae, the narrow spores, and the occurence on fallen,
decaying oak leaves. It may occur together with M.
mucor (Batsch) Gillet, which can be separated
because of a basal disc and M.
polyadelpha (Lasch) Kühner, which is entirely
white. M. exilis Aronsen & Gulden has a predominantly
brown pileus only occasionally with a faint pink tinge,
4-spored basidia, presence of clamps, and smaller but slightly
broader spores; further more it grows on Salix leaves. M. riparia Maas
Geest., M. juncicola (Fr.) Gillet, and M.
tubarioides (Maire) Kühner have a pink pileus
too, but those species grow on various monocotyledoneae
in wetland areas. M. catalaunica Robich, known
from Italy, has broadly pip-shaped to subglobose spores.