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Agaricus pattersonae
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Agaricus pattersonae

Common Name: None

Synonyms: None

Substrate: Ground

Location: Forests

Spore Color: Brown

Gill Color: Brownish 

Comments: 

There are several Agaricus sp. with brown scales on the cap that are outlined below. Most of the ones that are found under hardwoods will stain pink or red when damaged.

Kuo says Smith (1979) lists this species from Michigan but with flesh not staining significantly. I will go with Smith's name for that reason. This mushroom is not in  many field guides, although it is not that uncommon in my area (Indiana).

Lookalikes: 

There are a number of similar Agaricus species that have brown scales on the cap. Agaricus subrufescens grows under conifers.  A. silvaticus stains pinkish. A. haemorrhoidarius stains red. A. fuscofibrillosus has pressed down fibers rather than scales.

Pictures:

Agaricus pattersonae

9/13/12 - Brown County State Park - Nashville, IN

Agaricus pattersonae

Agaricus pattersonae

Agaricus pattersonae

Slightly older specimen.

Agaricus pattersonae

Agaricus pattersonae

8/24/12 - Griffey Woods - Bloomington, IN