Generally associated with conifers, Picea, Pinus, Juniperus, but occasionally found in deciduous woods. Widely distributed in South Norway, although not common. Summer to late autumn. See the records in The Norwegian Mycological Database.

Pileus up to 25 mm across, conical to parabolical, flattening with age, becoming convex to plane, with or without umbo, shallowly sulcate, translucent-striate, glabrous, hygrophanous, grey-brown, olivaceous brown to fairly dark brown with the margin orange to orange-yellow. Lamellae 16 - 26 reaching the stipe, ascending, narrowly adnate, decurrent with a short tooth, pale yellowish grey to greyish beige with bright orange to pale orange-yellow edge. Stipe up to 80 x 2 mm, hollow, straight to curved, terete, equal, firm, entirely pruinose when young, glabrescent except for the apex, whitish to yellowish at the apex, yellow brown to dark brown farther down or also orange yellow near the base, sometimes tinged with yellowish or orange shades; the base densely covered with yellow to orange fibrils. Odour very conspicuous; sweet, fruity, often experienced as farinaceous or faintly of anise.

Basidia 25-32 x 5.5-7 µm, slender-clavate, 4-spored. Spores 8.0-10.5 x 4.5-5.5 µm, elongated pip-shaped to subcylindrical, amyloid. Cheilocystidia 18-42 x 7-17 µm, forming a sterile band, variable shape but often clavate to obpyriform, long- to short.stalked, with orange contents, covered with fairly numerous, evenly spaced, simple, cylindrical excrescences 1-3 x 1 µm. Pleurocystidia similar. Lamellar trama dextrinoid. Hyphae of the pileipellis 2-3.5 µm wide, densely covered with simple to branched excrescences 1-22 x 1-3 µm, forming dense masses and tending to become somewhat gelatinized. Hyphae of the cortical layer of the stipe 2-3.5 µm wide, smooth to sparsely diverticulate, excrescences simple to furcate up to 9 x 1 µm, caulocystidia up to 10µm wide, simple to variously branched, subcylindrical to clavate, almost smooth to densely diverticulate. Clamp connections present.

Mycena aurantiomarginata is readily identified on account of the orange lamellar edge and the yellow to orange fibrils at the base of the stipe. It is a member of sect. Luculentae Maas Geest.

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Further images on the Internet:

Nahuby.sk

http://home.att.net/~mushroomhunt/Mycena_aurantiomarginata.htm

MykoWeb

Mycologie en Catalogne nord