Taxonomy and Systematics
Species: Agaricus campestris Linnaeus 1753
Notes on taxonomy: Agaricus campestris, also known as the field or meadow mushroom, was originally classified and named in 1753 by the Swedish biologist Carl Linnaeus. In 1872 Lucien Quelet, a French mycologist, moved the species to the genus Psalliota. Since then there have been many discoveries and individual species classifications of variants. Campestris is derived from the the latin word campus meaning field.
I keyed my specimen with Barron's "Mushrooms of Northeast North America: Midwest to New England" and confirmed with other sources.
Agaricus campestris caps vary from convex to flat and are 2-10 cm in diameter. The dry smooth caps are white in the early stages and age brown. When subjected to dry weather the caps often become scaly. The gills are free, well formed, thin, and often crowded. The gills originally have a pink pigment and then later darken to blackish-brown. The white stipes can grow as tall as 7 cm and 2 mm wide and are relatively uniform, smooth, and dry. Agaricus campestris have a veil membrane, leaving a ring around the stipe. Agaricus campestris spore prints are purple-brown to dark brown. Agaricus campestris fruit in scattered groups on the ground in in grassy areas, hence its common names, field/meadow mushroom. Agaricus campestris typically fruit between the months of June and September.
Agaricus campestris are definitely edible and rated as a choice fungi. According to wikipedia, many people who do not typically enjoy eating mushrooms like the taste of Agaricus campestris. Agaricus campestris are not commercially cultivated due to their rapid maturity rate and short shelf life.
Campus distribution and habitat
My well matured Agaricus campestris was found by itself, but relatively near another, on the ground in the pine trees north of the tennis courts (just south of the ohio parking lot) at 1:00 pm on Monday, 19 September, 2011. Another groups of Agaricus campestris was found under a tree on the sloped lawn between the student center and Dickinson. One of my specimens was fairly large. --Kyang 18:06, 27 September 2011 (UTC)
- Barron, George L. Mushrooms of Northeast North America: Midwest to New England. Edmonton: Lone Pine, 1999. Print.
- Bessette, Alan E., Arleen R. Bessette, and David W. Fischer. Mushrooms of Northeaster North America. Syracuse, NY: Syracuse UP, 1997. Print.
- "Agaricus campestris." Index Fungorum. Web. 19 Sept. 2011. <http://www.mushroomexpert.com/agaricus_campestris.html>.
- "Agaricus campestris: The Meadow Mushroom." MushroomExpert.com. Web. 19 Sept. 2011. <http://www.indexfungorum.org/Names/namesrecord.asp?RecordID=356498>.
- Agaricus campestris. Wikipedia: The Free Encyclopedia. Web. 19 Sept. 2011. <http://en.wikipedia.org/wiki/Agaricus_campestris>.
Edarham2 17:35, 21 September 2011 (UTC)