How to identify Wrinkled Thimble-cap

To correctly identify Wrinkled Thimble-cap (Ptychoverpa bohemica), 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 thimble-shaped, typically 2-5 cm tall and 1.5-4 cm wide. Its surface is characterized by irregular wrinkles, folds, or brain-like convolutions rather than the distinct pits found in true morels. The color ranges from yellowish-brown to dark brown. The cap is attached to the stipe only at the apex.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   Ptychoverpa bohemica is an ascomycete and therefore does not possess gills. The spores are produced within asci on the inner surface of the pits and wrinkles of the cap

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stipe ranges from 3-8 cm long and 1-2.5 cm thick, and is typically cylindrical or slightly enlarged at the base. The stipe surface can be smooth to slightly wrinkled, and its color ranges from whitish to pale yellowish-brown. The stem is hollow.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The fruit body's flesh is thin, brittle, and whitish to pale brownish.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body of Ptychoverpa bohemica typically measures 3-10 cm in height. It is composed of a cap and a stipe (stem).

6. 6

   Habitat

   Where it grows and on what substrate.

   Ptychoverpa bohemica is found in early spring, often in disturbed ground, along riverbanks, and in deciduous woods, particularly under cottonwood and aspen. It is often associated with moist habitats.

Key Facts

Cap surfaces

Wrinkled, folded

Growth Form

Solitary or scattered

Spore Print

Yellowish

Body color

Yellowish-brown to dark brown

Odor

Indistinct to earthy

Flesh bruises

Does not bruise

Height

3-10 cm

Cap Diameter

1.5-4 cm

Fruit body characteristics

• Gill attachment: N/A (Ascomycete)
• Stem shape: Cylindrical, slightly enlarged at base
• Stem surface: Smooth to slightly wrinkled
• Ring: Absent
• Stem cross-section: Hollow

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