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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.

Sulphur TuftHypholoma fasciculare

toxic

Sulphur TuftHypholoma fasciculare

Photo: (c) Alan Rockefeller, some rights reserved (CC BY)

Habitat

deciduous forests

mixed forests

under spruce

under pines

Season

from May to November

Strophariaceae

2–7 cm

Season

At its peakThe peak lasts until late October and the season usually until mid-November.

Today · 22–28 Oct89% of peak

how often reportedpeak

Season

May–Nov

Peak

Aug–Oct

Reports

837from Poland

Risk window

Sheathed Woodtuft grows at the same time

Both species grow together for about 14 wk a year. Most strongly from late August to mid-October.

Opieńka ciemnaIn the forest together about 11 wk a year.

Maślanka łagodnaIn the forest together about 11 wk a year.

Opieńka miodowaIn the forest together about 10 wk a year.

Opieńka bulwiastotrzonowaIn the forest together about 6 wk a year.

Curve from 837 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 sulfur yellow with an orange-brown center, smooth; grows in dense clusters on trunks and stumps. Gills sulfur yellow at first, then greenish and olive black (diagnostic); flesh very bitter.

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