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Agaricus placomyces

Common Name: Eastern Flat Topped Agaricus

Synonyms:

Substrate: Ground

Location: Forests

Spore Color: Brown

Gill Color: Whitish or pinkish when young, becoming brown with age. 

Time of Year: Summer to early fall

Comments: 

One of several white Agaricus species that can be found in our hardwood forests. The center of the cap should be mostly brown with fibers. There should also be some brown fibers radiating out from the center. Look for pink gills that turn brown. The pictures below show the state of transition, with some gills half pink and half brown.  The odor should be disagreeable, possibly like coal tar. The base of the stem should stain yellowish when cut. 

Lookalikes: 

Agaricus pocillator is the most similar mushroom to this. It can be differentiated by a bulb at the base of the stem, and it having less brown fibers on the cap. A. pocillator is also a smaller mushroom.  Agaricus silvicola is also similar, but it has a smooth white cap. As with all Agaricus, you should first be seeking out the pinkish or brownish gills to confirm the genus.

Pictures:

Agaricus placomyces

Note the gills in a state of transition from pink to brown.

Agaricus placomyces

The common name is fairly appropriate when fully opened.

8/27/11 - Lost Bridge West - Salamonie Reservoir - Andrews, IN 

Agaricus placomyces

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

Agaricus placomyces

8/25/12 - Shades State Park - Rockville, IN

Agaricus placomyces

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

Agaricus placomyces

10/4/11 - Hoosier National Forest - Monroe County, IN

Agaricus placomyces

9/20/12 - Morgan Monroe State Forest - Morgan County, IN