Galerina marginata

About

Galerina marginata, known colloquially as funeral bell, deadly skullcap, autumn skullcap or deadly galerina, is a species of extremely poisonous mushroom-forming fungus in the family Hymenogastraceae of the order Agaricales. Before 2001, the species G. autumnalis, G. oregonensis, G. unicolor, and G. venenata were thought to be distinct from G. marginata due to differences in habitat and the viscidity of their caps, but phylogenetic analysis showed that they are all the same species. Other closely related species that are also extremely poisonous are G. helvoliceps and G. fasciculata from Eastern Asia, G. patagonica from Australia, New Zealand and Argentina, and G. sulciceps from tropical localities.

Summary from Wikipedia