Synonyms: Marasmiellus omphaliiformis, Marasmius omphaliiformis.
Hydropus omphaliiformis is a small to medium-sized agaric fungus that grows in clusters on moss, soil, and decaying wood. In St. Petersburg and Leningrad Oblast, it typically fruits from July to October in coniferous and mixed forests. In north-western Russia, it has been found in similar habitats, often associated with spruce, fir, and birch trees. The cap is 1-4 cm in diameter, convex to flat, and grayish-brown to reddish-brown in color. The gills are decurrent, crowded, and white to pale gray. The stem is slender, cylindrical, and typically the same color as the cap.
Observations in Leningrad Oblast and north-western Russia revealed that Hydropus omphaliiformis grows on tree stumps. Specifically, on September 1, 2018, mushrooms were found on the top of a large spruce stump near Lisiy Nos, west of Saint Petersburg. The fungus was observed to form omphalinoid mushrooms, which were documented in this location. The presence of Hydropus omphaliiformis on spruce stumps suggests a possible association with coniferous trees. Further observations may be necessary to fully understand the habitat preferences and distribution of this species in the region. The discovery of Hydropus omphaliiformis in this area contributes to the knowledge of fungal diversity in north-western Russia, highlighting the importance of continued exploration and documentation of mycological finds. This information can inform future studies on the ecology and conservation of fungi in the region.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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