Hebeloma radicosum, commonly known as the rooting poison pie, is a species of agaric fungus in the family Hymenogastraceae.

Found in Japan, Europe, and North America, it is an ammonia fungus, and fruits on mole, mouse, or shrew middens.

[3] Historical synonyms have resulted from the transfer of the fungus to the genera Pholiota by Paul Kummer in 1871,[4] Dryophila by Lucien Quélet in 1886,[5] Myxocybe by Victor Fayod in 1889,[6] and Roumeguerites by Marcel Locquin in 1979.

This grouping of phylogenetically related species contains members that form a pseudorrhiza, such as H. danicum, H. senescens, H. calyptrosporum, H. birrus, H. pumilium, and H. cylindrosporum.

The surface of fresh caps is sticky; the color, which ranges from yellowish tan to golden brown to ochre, or pale cinnamon, is lighter towards the margin.

[10] The Japanese species Hebeloma radicosoides resembles H. radicosum in appearance and habitat, but can be distinguished by its yellower cap and lack of odor.

[16][17] A Japanese field study demonstrated that male flies of the genus Suillia rest on the mushrooms and actively defend their territory from others of the same species while waiting to mate with oviparous females.