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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.

Birch polyporeFomitopsis betulina

inedible

Birch polyporeFomitopsis betulina

Photo: (c) Piotr Lukasik, some rights reserved (CC BY)

Habitat

under birches

deciduous forests

Season

from January to December

Fomitopsidaceae

5–20 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

Oct–Mar

Reports

1059from Poland

Curve from 1059 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Key features

Kidney-shaped fruit body with a smooth, light brown skin and snow-white, corky flesh, with a characteristically inrolled margin. Underside white, with very fine pores. Grows only on birches and stays on the trunk through winter.

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