Fauna
Fungus · GBIF taxon 2561840

Amanita Mold

Hypomyces hyalinus

Also known as Amanita Parasite, White Amanita Mold

Amanita mold is a specialized parasitic fungus that infects mushrooms in the genus Amanita, completely disfiguring their host fruiting bodies. As the parasite engulfs the cap and stem, it coats the host in a dense, whitish to pale pinkish fungal mat and prevents the cap from expanding or producing normal gills. Found across North American woodlands in summer and autumn, it plays a unique ecological role by hijacking the tissue of host mushrooms.

ParasiticFungusWoodland
Amanita Mold reference1 / 7
Licensed reference(c) Richard Jacob, some rights reserved (CC BY), uploaded by Richard Jacob · cc-by
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & prey
  • Amanita species
ThreatsHabitat degradation and removal of host fungal communities
HabitatsDeciduous and mixed woodlands, growing directly on host mushrooms
Life spanEphemeral (lasts days to weeks on host fruiting body)
Classification
  1. OrderHypocreales
  2. FamilyHypocreaceae
  3. GenusHypomyces
  4. SpeciesHypomyces hyalinus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is high
Grows on toxic Amanita species; many wild fungi have toxic look-alikes, so never ingest wild mushrooms.
Why it is dangerous
Infects species of Amanita that contain lethal amatoxins or ibotenic acid, making infected host tissue extremely toxic if ingested.
How to recognize a risky encounter
Look for deformed, powdery white or pale pinkish crusts completely enveloping the caps and stems of unopened gilled mushrooms.
What to do
Observe and photograph in place without touching or consuming any part of the host mushroom or parasite.
Responsible observation
  • Observation: Look closely at deformed, white-coated mushroom stalks in oak and pine forests during late summer.
  • Safety: Do not attempt to forage or eat any mushroom infected by this parasite, as host toxins remain active.
  • Photography: Capture the contrast between the white parasitic crust and the surrounding forest floor leaf litter.
Related species
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