How to identify Olive Oysterling

To correctly identify Olive Oysterling (Sarcomyxa serotina), 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 olive-brown to yellowish-brown, often with a slimy or gelatinous surface, especially when wet. The shape is variable, ranging from kidney-shaped to fan-shaped or semicircular. The margin is often wavy or lobed.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   The gills are decurrent, meaning they run down the stem. They are closely spaced and yellowish-brown in color, often becoming darker with age.

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stem is short, stubby, and often lateral or absent. It is typically the same color as the cap or slightly lighter.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh is yellowish-brown and somewhat gelatinous, especially in wet conditions.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body of Sarcomyxa serotina is typically medium-sized, with a cap that ranges from 3 to 10 cm in diameter. It often grows in clusters, with individual caps overlapping.

6. 6

   Habitat

   Where it grows and on what substrate.

   Sarcomyxa serotina grows on decaying wood, particularly of deciduous trees such as beech, birch, and willow. It is typically found in late autumn to early winter.

Key Facts

Cap surfaces

Slimy or gelatinous when wet

Growth Form

Clustered

Spore Print

Yellowish-brown

Body color

Olive-brown to yellowish-brown

Odor

Mild

Flesh bruises

No bruising

Height

2-5 cm

Cap Diameter

3-10 cm

Fruit body characteristics

• Gill attachment: Decurrent
• Stem shape: Short, stubby, lateral or absent
• Stem surface: Smooth
• Ring: Absent
• Stem cross-section: Solid

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