Field mushroom
A grassland relative of cultivated button mushrooms.
Agaricus xanthodermus
Русское название: Шампиньон желтокожий
A poisonous Agaricus that may cause severe gastrointestinal symptoms. It can resemble edible relatives, and no single visual test guarantees a correct identification. A suspect wild mushroom should never be treated as food.

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 ↗Europe; introduced in other regions
Lawns, gardens, parkland and nutrient-rich soil
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.