How to identify Earthstar

To correctly identify Earthstar (Geastrum), 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 Earthstar is star-shaped and opens up to reveal the spores. The cap is typically a light brown color. They are usually between 2 and 6 inches wide.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   None

3. 3

   Stem

   Length, shape, surface, and any ring.

   Earthstars have a short, stout stem.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh of an earthstar is typically white and firm.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body of an earthstar is star-shaped. The endoderm is a thin, papery layer that covers the exoperidium. The endoperidium is a sac-like structure that contains the spores. The peridium is the outer layer of the fruiting body. It is typically a light brown color and can be smooth or textured.

6. 6

   Habitat

   Where it grows and on what substrate.

   They are found growing on the ground in woods and forests. They are often found near trees, such as oak, maple, and pine trees. They are also found near tree stumps or near decaying wood.

Key Facts

Cap surfaces

Smooth or textured

Growth Form

Solitary or clustered

Spore Print

Brown

Body color

Brown

Odor

Mild

Flesh bruises

Does not bruise

Height

2 to 6 inches

Cap Diameter

2 to 6 inches

Fruit body characteristics

• Gill attachment: None
• Stem shape: Short and Stubby
• Stem surface: Smooth
• Ring: None
• Stem cross-section: Solid

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