Yellow-staining mushroom
A poisonous Agaricus that may cause severe gastrointestinal symptoms.
Hypholoma fasciculare
Русское название: Ложноопёнок серно-жёлтый
A toxic clustered fungus growing on decaying wood. Yellowish colour and stump-growing habit are shared by several species. It is not an edible substitute for commonly collected wood-growing mushrooms.

Never decide to eat a wild mushroom from a photograph or online description. A mistake can be fatal. For mushroom ingestion or suspected poisoning, contact emergency medical services or a poison centre immediately, even if symptoms have not appeared.
Irish Poisons Centre mushroom safety ↗Temperate regions including Europe
Clusters on stumps and decaying wood
Images and brief descriptions are for learning, not for reliably identifying a specimen. Take particular care with poisonous plants and mushrooms.
Identification is never guaranteed by a photo. Scientific names are used to reduce confusion between local names.