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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.

Brown Roll-RimPaxillus involutus

deadly poisonous

Brown Roll-RimPaxillus involutus

Photo: (c) Victoria M., some rights reserved (CC BY)

Habitat

under birches

mixed forests

deciduous forests

under spruce

under pines

wetlands

Season

from July to October

Paxillaceae

4–20 cm

Season

EndingPast the peak. The season usually lasts until late October.

Today · 22–28 Oct71% of peak

how often reportedpeak

Season

Jul–Oct

Peak

Sep–Oct

Reports

256from Poland

Risk window

Chanterelle grows at the same time

Both species grow together for about 13 wk a year. Most strongly from early September to mid-September.

Mleczaj rudyIn the forest together about 12 wk a year.

Krowiak aksamitnotrzonowyIn the forest together about 11 wk a year.

Curve from 256 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 olive rusty brown, felty, with a strongly inrolled, grooved margin (key feature), funnel-shaped with age. Gills decurrent, yellow-brown, separating easily from the flesh, browning when pressed; cumulatively poisonous: causes the Paxillus syndrome (autoimmune hemolysis).

Reclassified: reclassified from 'toxic' per adversarial verify

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