Mica Cap (Coprinellus micaceus)

Mica Cap

Coprinellus micaceus

Emerging in dense clusters after rain, its caps glisten like scattered mica before melting into ink. Saprobic fungus; other names: glistening inky cap.

Prefers shaded areas, growing on decaying wood and buried roots.
3/week
Moderate
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Plant Needs

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Sunlight Prefers shaded areas, growing on decaying wood and buried roots.
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Watering Requires high moisture and ambient humidity to fruit.
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Temperature Fruits best in mild, damp weather during spring and autumn.
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Characteristics

  • Cap: 1-3 cm across, oval to bell-shaped, tawny-brown, covered with glistening mica-like granules when young, margin becoming striate;
  • Gills: Attached to the stem or free, initially white, turning dark brown then black, eventually deliquescing (melting) into black ink in age;
  • Stem: 2-8 cm tall, 2-5 mm thick, white, smooth or finely powdery, hollow, fragile;
  • Spores: Black in mass, smooth, elliptical with a central germ pore.
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Care Guide

Watering

Keep substrate consistently moist to encourage fruiting

Fertilization

N/A. Fungi do not require traditional fertilizers; they decompose organic matter.

Spent Coffee Grounds:Mix cooled, pasteurized coffee grounds into the woody substrate to provide extra nitrogen for mycelial growth; avoid unpasteurized grounds to prevent green mold contamination.
Pruning
  • Harvest fruiting bodies quickly before they deliquesce (turn to ink);
  • Remove old, inky caps to prevent messy decay in cultivated areas.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Ingestion of raw wild mushrooms may cause mild gastrointestinal distress.

Humans: Generally edible when cooked young, but raw consumption may cause gastrointestinal upset.

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Garden Uses & Culture

Culture: Inky caps have historically been used to make actual ink for writing and drawing in Europe, providing a unique intersection of mycology and historical documentation.

Usage: - **Culinary**: Edible when young and cooked, though highly perishable; - **Practical**: The black liquid from autodigestion can be boiled, strained, and used as writing ink.