How to identify Ink Cap

To correctly identify Ink Cap (Coprinopsis atramentaria), check each of these features in order. Misidentification is the most common cause of mushroom poisoning, so cross-reference multiple sources.

Step-by-step identification

1. 1

   Cap

   Shape, color, surface texture, and diameter.

   The cap is initially bell-shaped, expanding to become flat with age. It is typically gray to brownish-gray in color and may have a slightly furrowed surface.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   The gills are closely spaced and free from the stem. They start white and turn black as the mushroom matures, eventually dissolving into an inky fluid.

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stem is slender, hollow, and white to grayish in color. It is smooth and lacks a ring.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh is thin and fragile, with a mild odor when young.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body is delicate and prone to rapid deterioration, often dissolving into an inky liquid as it matures.

6. 6

   Habitat

   Where it grows and on what substrate.

   Ink Caps are commonly found in grassy areas, disturbed ground, and urban environments, often growing in clusters.

Key Facts

Cap surfaces

Slightly furrowed

Growth Form

Clustered

Spore Print

Black

Body color

Gray to brownish-gray

Odor

Mild when young

Flesh bruises

Does not bruise

Height

5-15 cm

Cap Diameter

2-5 cm

Fruit body characteristics

• Gill attachment: Free
• Stem shape: Cylindrical
• Stem surface: Smooth
• Ring: Absent
• Stem cross-section: Hollow

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