Torn fibrecap Toxic?

Updated 2026-03-06| 3 min read| 2,495 found this helpful
Inocybe rimosa (Bull.) P.Kumm.; Inocybe fastigiata (Schaeff.) Quél.
1

Contains 333-1100x more muscarin than fly agaric; muscarin is heat-stable and not broken down by digestive enzymes

2

Onset of cholinergic poisoning symptoms occurs 15-60 minutes post-ingestion

3

Atropine is the recommended antidote for life-threatening cholinergic symptoms

FAQ

Is Torn fibrecap toxic to Humans?

Salivation, lacrimation, vomiting, diarrhea, abdominal pain, apathy, miosis, bradycardia or secondary tachycardia (from hypovolemia), bronchial secretions, tachypnea, hypothermia (High)

Is Torn fibrecap toxic to Cats?

No species-specific data available; expected to present similar cholinergic symptoms including salivation, vomiting, diarrhea and breathing difficulty if ingested (High)

Is Torn fibrecap toxic to Dogs?

No species-specific data available; expected to present similar cholinergic symptoms including salivation, vomiting, diarrhea and breathing difficulty if ingested (High)

Is Torn fibrecap toxic to Horses?

No species-specific data available; expected to present similar cholinergic symptoms including salivation, colic, diarrhea and breathing difficulty if ingested (High)

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Toxicity Details

Humans
High

Salivation, lacrimation, vomiting, diarrhea, abdominal pain, apathy, miosis, bradycardia or secondary tachycardia (from hypovolemia), bronchial secretions, tachypnea, hypothermia

Cats
High

No species-specific data available; expected to present similar cholinergic symptoms including salivation, vomiting, diarrhea and breathing difficulty if ingested

Dogs
High

No species-specific data available; expected to present similar cholinergic symptoms including salivation, vomiting, diarrhea and breathing difficulty if ingested

Horses
High

No species-specific data available; expected to present similar cholinergic symptoms including salivation, colic, diarrhea and breathing difficulty if ingested

Toxicity Snapshot

Toxic PartsWhole fruiting body (cap, gills, stem)
Exposure RouteIngestion (only confirmed toxic exposure route)
Toxic CompoundsMuscarin (quaternary amine)

First Aid & Prevention

First 30 Minutes

  • • Induce vomiting only if the patient is conscious and ingestion occurred within the last 2 hours
  • • Collect any remaining mushroom sample for accurate species identification
  • • Avoid giving food or liquids that may speed up toxin absorption

Contact Vet Immediately

  • • If ingestion of this species is confirmed, even if no symptoms have appeared yet
  • • If any poisoning symptoms appear after wild mushroom exposure
  • • If the patient experiences difficulty breathing, excessive salivation/bronchial secretions, or abnormal heart rate

Prevention

  • • Never consume wild mushrooms unless positively identified as safe by a certified experienced mycologist
  • • Restrict pet and livestock access to areas where this mushroom species is known to grow
  • • Learn to distinguish this toxic species from common lookalike edible mushrooms before foraging

Treatment & Prognosis

  • • Provide symptomatic supportive care including fluid therapy to correct hypovolemia
  • • Administer atropine for life-threatening cholinergic symptoms until respiratory secretions stop
  • • Continuously monitor vital signs (heart rate, respiratory rate, body temperature) until symptoms fully resolve
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Professional Toxicology

Scientific NameInocybe rimosa (Bull.) P.Kumm.; Inocybe fastigiata (Schaeff.) Quél.
AliasesInocybe fastigiata、Kegeliger Risspilz (German)、Inocybe fastigié (French)
Toxicity Grade
HumansHigh
CatsHigh
DogsHigh
HorsesHigh
Target Organs
Gastrointestinal tractRespiratory systemCardiovascular systemExocrine glandsEyes
Mechanism of Action

• Excess muscarin stimulates peripheral cholinergic receptors, triggering over-secretion of exocrine glands and altered autonomic nerve function

• Muscarin is not degraded by digestive enzymes and is poorly absorbed in the gastrointestinal tract

• Muscarin cannot cross the blood-brain barrier, so central nervous system effects are limited

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cat: No confirmed species-specific toxicology data available; ingestion is expected to cause severe cholinergic poisoning requiring immediate veterinary intervention
Dog: No confirmed species-specific toxicology data available; ingestion is expected to cause severe cholinergic poisoning requiring immediate veterinary intervention
Horse: No confirmed species-specific toxicology data available; ingestion is expected to cause severe cholinergic poisoning requiring immediate veterinary intervention
Confusion Risk

The following plants look similar and may be confused:

Field mushrooms (most edible, except yellow-staining mushroom) Psalliota spp.
Similar pale brown cap shape; key difference: Torn fibrecap has a fibrous, radially splitting cap, while edible Psalliota have gills that turn pink then dark brown with age, and lack the rimose fibrous texture
St. George's mushroom Calocybe gambosa
Similar rounded light brown cap; key difference: St. George's mushroom has a soft non-fibrous cap, pleasant mealy scent, and white to cream gills, unlike the brownish gills of torn fibrecap
Fairy ring champignon Marasmius oreades
Similar light brown cap appearance; key difference: Fairy ring champignon is smaller, has a tough leathery texture, and a distinct sweet clove-like scent absent in torn fibrecap
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Related Toxic Plants

Deadly fibrecap
Inocybe erubescens
Severe toxicity
White fibrecap
Inocybe geophylla
High toxicity
Lilac fibrecap
Inocybe lilacina
High toxicity

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Data Sources

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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