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Grzybiarz is a mobile app for mushroom foragers. Its on-device AI helps you spot fruiting bodies in the leaf litter and suggests a species from a photo, and the app keeps a private map of your finds. Everything runs on your phone and works fully offline in the forest without signal.

Satan's BoleteRubroboletus satanas

toxic

Satan's BoleteRubroboletus satanas

Photo: (c) Fyodor Pudovikov, some rights reserved (CC BY)

Habitat

under oaks

beech forest

warm calcareous soils

deciduous forest

Season

from June to September

Season

Out of seasonOut of season. It usually grows from mid-July to late September.

Today · 22–28 Octout of season

how often reportedpeak

Season

Jun–Sep

Peak

Aug–Sep

Reports

215Poland and neighbours

Risk window

King Bolete grows at the same time

Both species grow together for about 10 wk a year. Most strongly from late August to mid-September.

Curve from 215 observations (GBIF: Poland, Czechia, Slovakia, Germany), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Species description

Highly toxic bolete with red pores and a red reticulum on the stipe. Flesh blues instantly when cut. Grows in warm oak and beech woods on calcareous soils.

Recognition features

confirm features

0 / 4

Pores distinctly red to orange

Stipe with a dense red reticulum

Flesh blues strongly and rapidly

Beech and oak woods, calcareous warm soils

Toxic look-alikesSpecies most often confused with this one.

King BoleteBoletus edulis

edible

Lurid BoleteSuillellus luridus

conditional

Pores red to orange, flesh blues rapidly when cut.

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