Mycena chlorantha (Fr.) P. Kumm.

Führer Pilzk. (Zwickau): 110 (1871)

© 2007 Michael Krikorev

Growing among sparse and low vegetation of grasses, Ammophila, Carex and mosses on poor sandy soil in coastal dunes. Also found in burnt Calamagrostis grassland. Autumn to early winter. Widespread and common in coastal western Europe, elsewhere rare or absent. In Norway very rare. It is listed as Vulnerable (VU) in the Norwegian red list (2021).

Pileus 5-20(-25) mm across, obtusely conical or convex to campanulate, without or with obtuse umbo, smooth to shallowly sulcate, translucent-striate, hygrophanous, olive green to olive brownish or olivaceous yellow-green to dingy yellowish grey-green, sometimes with the centre more brownish or slightly fulvous, and the margin very pale greyish green to pale yellowish or of a bright citrine, fading considerably on drying out and turning ochraceous greenish yellow, pale olivaceous yellow or brownish yellow. Lamellae (14-)16-22 reaching the stipe, ascending, adnate (sometimes rather narrowly) to emarginate and not infrequently decurrent with a tooth, dingy whitish or very pale greyish brown to pale yellowish grey-green, the edge pale yellow to citrine or greenish yellow to greenish, finally concolorous with or even paler than the sides. Stipe 15-50 x (0.7-)1-2 mm, +/- rooting, hollow, fairly firm, equal or slightly broadened below, straight or curved, smooth to subfibrillose, pruinose or minutely puberulous above, glabrous for the greater part, slightly shiny, pale grey-brown or dingy yellowish grey-green to fairly dark grey tinged olive green, at the apex dingy whitish or pale watery grey to pale grey-brown, the base covered with long, coarse, flexuous, pale greenish to whitish fibrils. Odour indistinctive or somewhat chemical when fresh, but pronouncedly of iodoform on drying out; taste recorded as "sourish to somewhat chemical" (Maas Geesteranus 1984).

Basidia 23-41 x 8-12 µm, clavate, 4-spored, with sterigmata 5-9 µm long. Spores (7.5-)9-11(-12.5) x (4.5-)5.2-6.5(-7) µm, Q 1.4-1.6, Qav=1.56, pip-shaped, smooth, amyloid. Cheilocystidia 15-50 x 8-22 µm, occuring mixed with basidia to more or less forming a sterile band, clavate to obpyriform, sometimes sublageniform to almost cylindrical, with pale green to yellowish contents, covered with fairly few, evenly spaced warts or cylindrical excrescenses 1-6 x 0.5-1.5 µm, more rarely entirely smooth, and sometimes with much longer and broader, branched excrescences. Pleurocystidia similar, if present. Lamellar trama dextrinoid, vinaceous in Melzer’s reagent. Hyphae of the pileipellis 2-4.5 µm wide, covered with warts or cylindrical excrescences 0.5-7 x 0.5-1.5 µm, which tend to grow into much longer, very branched, densely corraloid masses; terminal cells clavate, smooth or covered with excrescences. Hyphae of the cortical layer of the stipe 2-3.5 µm wide, sparsely covered with warts or cylindrical excrescences 0.5-7.5 x 1-1.5 µm. Clamp connections present in all tissues.


Microphotos of cheilocystidia - 1

Microphotos of cheilocystidia - 2

Mycena chlorantha is a member of sect. Filipedes (Fr.) Quél. It is confined to coastal sand dunes and coastal grassland. Reports from woods have proved to be misidentifications, e.g. of Mycena arcangeliana. It grows exclusively on grasses, especially on Ammophila (Elborne 1996). Mycena flavescens can occur in the same habitat but has a raphanoid smell and less greenish tinges on the cap. Mycena citrinovirens has more or less the same colours but is generally a smaller species growing under Juniperus, is 2-spored and with somewhat broader spores and cheilocystidia with longer excrescences.

Go to sect. Filipedes.


© Arne Aronsen 2002-2023