A foraging companion

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Identify.
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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.

Species atlas
Dusty PuffballBovista nigrescens
edible
Dusty PuffballBovista nigrescens
Photo: (c) Jon Mortin, some rights reserved (CC BY)
Habitat
meadows, pastures
parks, treelines
Season
from July to October
Agaricaceae
3–8 cm
Season
Out of seasonOut of season. It usually grows from mid-July to mid-October.
Today · 22–28 Octout of season
how often reportedpeak
Season
Jul–Oct
Peak
Aug–Sep
Reports
–estimate
Risk window
Death Cap grows at the same timeBoth species grow together for about 14 wk a year. Most strongly from mid-August to mid-September.
Too few observations for a curve. The season shape is an estimate from the atlas months.
Key features
Fruit body spherical, white and smooth at first; with time it peels, revealing an inner, dark brown to blackish brown, papery layer. No stem and no distinct apical opening (it splits irregularly); edible only when young, while the flesh is completely white and firm.
Similar (be careful)Confusions documented in our database
DeathcapAmanita phalloides
deadly
The Dusty Puffball has uniform flesh inside; a young Deathcap in the 'egg' already shows the outline of the mushroom when cut. Always cut in half.
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Grzybiarz
Grzybiarz is a foraging assistant; the decision to harvest is yours.
© 2026 GrzybiarzVersion 0.0.1 · f66d236
Kurzawka czerniejąca (Bovista nigrescens) — Edible · Grzybiarz