How to identify King Oyster Mushroom

To correctly identify King Oyster Mushroom (Pleurotus eryngii), 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 of the King Oyster Mushroom typically ranges from 5 to 20 cm in diameter. It is convex when young, becoming flattened with age. The color varies from light tan to dark brown, with a smooth, dry surface.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   The gills are white to cream-colored, closely spaced, and decurrent, running down the stem.

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stem is thick, solid, and white, typically ranging from 5 to 15 cm in length and 2 to 5 cm in diameter. It is smooth and dry, with no ring or volva.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh is thick, firm, and white. It has a mild, slightly sweet aroma and flavor.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body is large and fleshy, consisting of a thick stem and a relatively small cap.

6. 6

   Habitat

   Where it grows and on what substrate.

   King Oyster Mushrooms are found growing on decaying wood or in grasslands, often associated with the roots of herbaceous plants.

Key Facts

Cap surfaces

Smooth, dry

Growth Form

Solitary or in small clusters

Spore Print

White to lilac-gray

Body color

White stem, tan to brown cap

Odor

Mild, slightly sweet

Flesh bruises

Does not bruise

Height

5-15 cm

Cap Diameter

5-20 cm

Fruit body characteristics

• Gill attachment: Decurrent
• Stem shape: Club-shaped to cylindrical
• Stem surface: Smooth
• Ring: Absent
• Stem cross-section: Solid

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