This mushroom was also found in my front lawn and was growing on the lawn with several other mushroom species.
Cap is arched and somewhat granulose. Color in the cap varies with a dark center and variegate edges. No apparent partial veil. Gills are even, broad and subsistent. They are attached decurrently and are of an average thickness. The stem is central and equal with longitudinal striations. No apparent bulb.

Image Alt Text: