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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.

Witch's butterTremella mesenterica

inedible

Witch's butterTremella mesenterica

Photo: no rights reserved

Habitat

deciduous forests

mixed forests

under oaks

Season

from January to December

Tremellaceae

2–10 cm

Season

All yearGrows all year round. The curve only shows when people photograph it most.

Today · 29 Oct–4 Novout of season

how often reportedpeak

Season

Jan–Dec

Peak

Nov–Feb

Reports

426from Poland

Curve from 426 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Key features

Gelatinous fruit bodies folded like a brain, bright yellow to orange. In drought they shrink into a hard crust and revive after rain. They grow on branches of deciduous trees and are best seen in winter in the leafless forest.

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