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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.

Black Witches' ButterExidia glandulosa

inedible

Black Witches' ButterExidia glandulosa

Photo: (c) Yuliana Leshchenko, some rights reserved (CC BY)

Habitat

deciduous forests

under oaks

Season

from October to April

Auriculariaceae

1–6 cm

Season

Starting soonStarts in about 7 days. The peak is usually from late December.

Today · 29 Oct–4 Novout of season

how often reportedpeak

Season

Oct–Apr

Peak

Dec–Mar

Reports

51from Poland, few

Curve from 51 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Key features

Black, gelatinous patches merging into elongated ridges along branches. Surface matte, covered with tiny warts. In drought it dries into a thin crust. Typical of oaks and hazel in the cool season.

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