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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.

Giant's False MorelGyromitra gigas

toxic

Giant's False MorelGyromitra gigas

Photo: no rights reserved

Habitat

under spruce

mixed forests

under pines

Season

from March to June

Discinaceae

6–25 cm

Season

Out of seasonOut of season. It usually grows from mid-March to mid-May.

Today · 22–28 Octout of season

how often reportedpeak

Season

Mar–Jun

Peak

Mar–Apr

Reports

54from Poland, few

Risk window

Yellow Morel grows at the same time

Both species grow together for about 6 wk a year. Most strongly from mid-April to late April.

Curve from 54 observations (iNaturalist, Poland), smoothed week by week. It shows when foragers most often report the species, not how much of it grows.

Key features

Fruit body massive, stocky; cap folded like a brain, yellow to ochre brown, much larger than in the False Morel. Stem short, thick, white, deeply furrowed, chambered, often almost hidden under the cap; contains gyromitrin in a lower concentration, but is still considered poisonous.

Reclassified: synonim iNat -> Maublancomyces gigas [taxon-fix 2026-06-08]

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