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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.

Oyster MushroomPleurotus ostreatus

edible

Oyster MushroomPleurotus ostreatus

Photo: no rights reserved

Habitat

deciduous forests

parks, treelines

beech forests

Season

from October to March

Pleurotaceae

5–25 cm

Season

At its peakThe peak lasts until mid-December and the season usually until early February.

Today · 29 Oct–4 Nov91% of peak

how often reportedpeak

Season

Oct–Mar

Peak

Nov–Dec

Reports

339from Poland

Risk window

Eastern American jack-o'-lantern grows at the same time

Both species grow together for about 4 wk a year.

Curve from 339 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Key features

Cap shell-shaped or kidney-shaped, steel gray to brown, fading with age. Gills white, running far down the short, lateral stem. Fruit bodies grow in overlapping tiers, one above another, on trunks of deciduous trees; the flush starts after the first frosts.

Similar (be careful)Confusions documented in our database

Eastern American jack-o'-lanternOmphalotus illudens

toxic

The Oyster Mushroom has a gray to brown cap and grows on hardwood after frosts. Omphalotus is uniformly orange, grows in summer at the base of stumps, and its gills glow in the dark. Orange color in winter = not an Oyster Mushroom.

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