How to identify Birch Polypore

To correctly identify Birch Polypore (Fomitopsis betulina), 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.

   Smooth, brown to grayish-brown upper surface, often with a varnished appearance. The surface can become cracked and irregular with age.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   No gills. The underside is covered with small, white pores.

3. 3

   Stem

   Length, shape, surface, and any ring.

   Absent. The fruit body attaches directly to the tree.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   Tough and corky, white to pale brown.

5. 5

   Fruiting body

   Overall growth pattern.

   Hoof-shaped bracket fungus, typically 5-20 cm wide.

6. 6

   Habitat

   Where it grows and on what substrate.

   Exclusively on birch trees, often on dead or dying branches.

Key Facts

Cap surfaces

Smooth, becoming cracked

Growth Form

Bracket

Spore Print

White

Body color

Brown and white

Odor

Mild

Flesh bruises

No bruising

Height

5-20 cm

Cap Diameter

5-20 cm

Fruit body characteristics

• Gill attachment: N/A (pores)
• Stem shape: Absent
• Stem surface: N/A
• Ring: Absent
• Stem cross-section: N/A

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