Synonym: Agaricus rubromarginatus.
Common name: red edge bonnet.
Russian name: Mitsena krasnookaymlennaya.
Mycena rubromarginata is a small to medium-sized agaric fungus with a bell-shaped to conical cap, typically 1-3 cm in diameter, and a slender stem. The cap is often reddish-brown to brown with a distinctive red or pinkish margin, while the gills are pale yellow to cream-colored. In St. Petersburg, Leningrad Oblast, and north-western Russia, Mycena rubromarginata has been found growing in clusters on decaying wood, stumps, and tree roots, often in moist, shaded areas of coniferous and mixed forests. Fruitings typically occur from late summer to early autumn.
Observations of Mycena rubromarginata in Leningrad Oblast and north-western Russia reveal that the fungus grows in association with various tree species. On August 23, 2017, it was found on an alder tree near Lisiy Nos, west of Saint Petersburg. In a spruce forest on the west side of Kavgolovskoe Lake near Toksovo, the fungus was observed growing alongside Earpick fungus (Auriscalpium vulgare) and Yellowleg bonnet (Mycena epipterygia) on August 25, 2017. The same day, large masses of Mycena rubromarginata were found in the same spruce forest, indicating a preference for this habitat. Multiple observations in the area suggest that the fungus is common in spruce forests near Toksovo, often growing in abundance under spruce trees. These findings provide insight into the ecological preferences of Mycena rubromarginata in north-western Russia.
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