Western Jack-O'-Lantern
ExploreFungi
Western Jack-O'-Lantern
omphalotus olivascens
The Western Jack-O'-Lantern (Omphalotus olivascens) is a fascinating, large, fleshy mushroom native to the Pacific Coast of North America. Known for its brilliant but toxic nature, this mushroom captivates foragers and scientists alike due to its striking appearance and unique ecological traits. It is primarily saprobic, gaining nutrients by decomposing the dead wood of hardwood trees like oaks and eucalyptus. Despite its beauty, it is highly toxic to humans, containing illudin compounds that cause severe gastrointestinal distress if consumed.
Habitat: Found on decaying wood, stumps, or buried roots of hardwood trees, particularly oaks and eucalyptus.
Appearance
This mushroom is characterized by a cap measuring 5 to 18 centimeters across, which is initially convex but flattens or becomes funnel-shaped with age. Its coloration ranges from olive-orange to bronze or yellowish-brown, often with metallic or olive overtones. The gills are deeply decurrent, running down the stout, solid stem, and they have a distinct sharp-edged appearance. In complete darkness, these gills emit a faint, ghostly green bioluminescent glow.
KingdomFungiPhylumBasidiomycotaClassAgaricomycetesOrderAgaricalesFamilyOmphalotaceaeGenusOmphalotus
Category
FungiRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
It is frequently mistaken for the delicious, edible chanterelle mushroom, making it a common culprit in wild mushroom poisonings along the US West Coast.
The chemical compound illudin S, extracted from Jack-O'-Lantern mushrooms, has been researched for its potential use in developing targeted anti-cancer drugs.
The glowing effect is caused by the same chemical pathway found in fireflies, though the fungal light shines constantly rather than flashing.
Special abilities
Ability
Ghostly Bioluminescence
The gills of the mushroom emit a faint green glow in the dark due to a chemical reaction between the compound luciferin and the enzyme luciferase.
Ability
Illudin Toxin Defense
Produces powerful illudin toxins that serve as a chemical deterrent against various mammalian and insect predators.
Ability
Lignin Degradation
Secretes robust extracellular enzymes that break down resilient wood compounds like lignin and cellulose, recycling nutrients back into the soil.
Measurements & details
- Length
- 5-18 cm
- Weight
- 0.05-0.3 kg
Diet & Feeding
As a saprobic fungus, it feeds by secreting enzymes to externally digest dead hardwood before absorbing the rich organic nutrients.
Primary Foods
- Dead oak wood
- Dead eucalyptus wood
- Decaying hardwood roots
Ecological connections
host plant
Coast Live Oak
Quercus agrifolia
Serves as a primary decomposer of dead wood for this dominant California hardwood tree.
eaten by
Pacific Banana Slug
Ariolimax columbianus
Feeds on the flesh and gills of the mushroom despite the presence of toxic illudin compounds.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Western Jack-O'-Lantern?
The easiest way to identify Western Jack-O'-Lantern is to use the Snappit nature identifier app.
How long is Western Jack-O'-Lantern?
5-18 cm
How much does Western Jack-O'-Lantern weigh?
0.05-0.3 kg
What does Western Jack-O'-Lantern eat?
As a saprobic fungus, it feeds by secreting enzymes to externally digest dead hardwood before absorbing the rich organic nutrients.
Where is Western Jack-O'-Lantern usually found?
Found on decaying wood, stumps, or buried roots of hardwood trees, particularly oaks and eucalyptus.
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