An Amanita muscaria, commonly known as the fly agaric or fly amanita [*] in the grounds of Blarney Castle yesterday. It’s a poisonous mushroom found throughout temperate and boreal regions of the Northern Hemisphere, according to Wikipedia.
It’s also poisonous, but these days death from ingestion is rare. It has psychoactive uses too, and it’s eaten in various places.
Thanks Catherine for letting me know where these mushrooms were. She posted a nice photo of a mushroom from there recently! The nice thing about these mushrooms is that they are quite large, so you don’t really need a macro lens to get a photo like this of them.