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A pocket companion for mushroom foragers, powered by on-device AI that helps you spot fruiting bodies in the leaf litter, suggests a species from a photo, and keeps a private map of your finds. It all runs on your phone, fully offline, deep in the woods, with no signal.

Bitter BoleteTylopilus felleus

inedible

Bitter BoleteTylopilus felleus

Photo: (c) Shirley Zundell, some rights reserved (CC BY)

Habitat

pine forest

under spruce

mixed forest

deciduous forest

Season

June to October

Species description

Inedible due to extreme bitterness, a single specimen can ruin an entire dish. Resembles a bolete but tubes turn pinkish with age and the stipe reticulum is dark brown.

Recognition features

confirm features

0 / 4

Whitish tubes that turn pink with age

Dark brown, coarse reticulum on the stipe

Extremely bitter (tongue-tip test)

Coniferous and mixed forests, acidic soils

Toxic look-alikesSpecies most often confused with this one.

King BoleteBoletus edulis

edible

Bay BoleteImleria badia

edible

Pine BoleteBoletus pinophilus

edible

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