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Agaricus arvensis — Overview

Horse Mushroom learn more about names for this taxon

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Agaricus arvensis

Agaricus arvensis
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium
cap is convex
hymenium is free
stipe has a ring

spore print is brown

to blackish-brown
ecology is saprotrophic
edibility: edible

Agaricus arvensis, commonly known as the horse mushroom, is a mushroom of the genus Agaricus.

Taxonomy[edit]

It was described as Agaricus arvensis by Jacob Christian Schaeffer in 1762, and given numerous binomial descriptions since. Its generic name arvensis means 'of the field'.

Description[edit]

Agaricus arvensis showing (the so-called) 'cogwheel' on left-hand specimen

The cap is similar to that of Agaricus campestris (the field mushroom). The gills are white at first (when this fungus is most often confused with deadly Amanita genus). They later pass through grey and brown to become dull chocolate. There is a large spreading ring, white above but sometimes with yellowish scales underneath. Viewed from below, on a closed-cap specimen, the twin-layered ring has a well-developed 'cogwheel' pattern around the stipe. This is the lower part of the double ring. The odor is described as like anise.[1] It belongs to a group of Agaricus which tend to stain yellow on bruising.

Similar species[edit]

Distribution and habitat[edit]

It is one of the largest white Agaricus species in Britain (where it appears during the months of July-November), West Asia (Iran)[3] and North America. Frequently found near stables, as well as in meadows, it may form fairy rings. The mushroom is often found growing with nettles (a plant that also likes nutrient-rich soil). It is sometimes found associated with spruce.[4]

Conservation[edit]

This mushroom is considered common and widespread, and is not a conservation concern.[5]

Edibility[edit]

Much prized by farmers and gypsies for generations, the horse mushroom is regarded as one of the most delicious edible fungi, although the fruitbodies of this and other yellow-staining Agaricus species often have a build-up of heavy metals, such as cadmium and copper.[5]

See also[edit]

References[edit]

  1. ^ Miller, Orson. Mushrooms of North America. New York: E.P. Dutton, 1984.
  2. ^ Roger Phillips (2006). Mushrooms. Pan MacMillan. ISBN 0-330-44237-6. 
  3. ^ Asef Shayan MR. (2010). قارچهای سمی ایران (Qarch-ha-ye Sammi-ye Iran) [Poisonous mushrooms of Iran] (in Persian). Iran shenasi. p. 214. ISBN 978-964-2725-29-8. 
  4. ^ Lincoff, Gary. The Audubon Society Field Guide to North American Mushrooms. Chanticleer Press: New York, 1981.
  5. ^ a b "Plants & Fungi: Agaricus arvensis (horse mushroom) - Species profile from". Kew. Retrieved 2013-05-19. 

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