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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.

King BoleteBoletus edulis

edible

King BoleteBoletus edulis

Photo: (c) Alan Rockefeller, some rights reserved (CC BY)

Habitat

pine forest

mixed forest

under oaks

under spruce

beech forest

Season

from June to November

Season

EndingPast the peak. The season usually lasts until early November.

Today · 22–28 Oct40% of peak

how often reportedpeak

Season

Jun–Nov

Peak

Aug–Oct

Reports

1412from Poland

Risk window

Satan's 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 1412 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Species description

One of the most prized edible mushrooms. Grows singly or in groups, mostly from summer through late autumn. Recognised by a thick, barrel-shaped stipe with a white reticulum and a brown cap.

Recognition features

confirm features

0 / 5

Tubes white to yellowish (never pink or red)

White reticulum on the stipe

Flesh white, not bluing when cut

Brown cap with a faint sheen

Pleasant, nutty aroma

Toxic look-alikesSpecies most often confused with this one.

Satan's BoleteRubroboletus satanas

toxic

Red pores, flesh blues intensely, stipe with a red reticulum.

Bitter BoleteTylopilus felleus

inedible

Very bitter taste, pores turn pinkish, dark reticulum on the stipe.

Lurid BoleteSuillellus luridus

conditional

Pores red to orange, flesh blues rapidly when cut.

Pine BoleteBoletus pinophilus

edible

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