Inky Cap (Coprinellus)

Inky Cap

Coprinellus

Ephemeral saprobic fungi that dissolve into black ink, recycling forest nutrients. Other names: Mica cap, Fairy inkcap.

Prefers full shade or dappled light in forest understories; avoid direct sunlight.
3/week
Challenging
🌱

Plant Needs

☀️
Sunlight Prefers full shade or dappled light in forest understories; avoid direct sunlight.
💧
Watering Requires high environmental humidity and moisture in the substrate to produce fruiting bodies.
🌡️
Temperature Thrives in mild, damp weather conditions.
🔍

Characteristics

  • Cap: Bell-shaped to convex, deeply grooved or pleated, often covered with glistening, mica-like granules when young;
  • Gills: Closely spaced, initially white or pale brown, turning black and often liquefying (deliquescing) with age;
  • Stem: Slender, fragile, hollow, typically white and lacking a ring;
  • Mycelium: Hidden underground or within decaying wood, forming a white, thread-like network.
🛠️

Care Guide

Watering

Maintain constant moisture in the substrate during fruiting seasons

Fertilization

Add fresh hardwood chips or leaf litter. Fungi do not require traditional plant fertilizers; they feed on decaying organic matter.

Organic Substrate Booster:Mix spent coffee grounds with untreated hardwood sawdust or wet cardboard to encourage mycelial growth; avoid treated wood or high-salt materials.
Pruning
  • No pruning required; fruiting bodies will naturally deliquesce (melt into ink) and disappear within a few days.
⚠️

Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: May cause mild gastrointestinal upset if ingested raw.

Humans: Generally non-toxic when cooked, but raw consumption can cause gastrointestinal distress. Note: Do not confuse with related Coprinopsis species which cause severe reactions when consumed with alcohol.

📖

Garden Uses & Culture

Culture: In Western folklore, the sudden, overnight appearance of delicate mushrooms in clusters is often associated with fairy magic and the ephemeral nature of life.

Usage: Ecologically vital as decomposers of dead wood. Some species (like C. micaceus) are foraged for food, though they must be cooked immediately before they dissolve.