Agaricus

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Agaricus
Poisonous A. xanthodermus
Poisonous A. xanthodermus
Scientific classification
Kingdom: Fungi
Phylum: Basidiomycota
Subphylum: Agaricomycotina
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Agaricus
Species

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Agaricus is a large and important genus of mushrooms containing both edible and poisonous species, with possibly over 300 members worldwide[1][2]. The genus includes the common ("button") mushroom (Agaricus bisporus), and the Field mushroom (Agaricus campestris) the dominant cultivated mushrooms of the West.

Members of Agaricus are characterized by having a fleshy cap or pileus, from the underside of which grow a number of radiating plates or gills on which are produced the naked spores. They are distinguished from other members of their family, Agaricaceae, by their chocolate-brown spores. Members of Agaricus also have a stem or stipe, which elevates the pileus above the object on which the mushroom grows, and a partial veil, which protects the developing gills and later forms a ring or annulus on the stalk.

Contents

[edit] Taxonomy

For many years members of the genus Agaricus were given the generic name Psalliota, and this can still be seen in older books on mushrooms. All proposals to conserve Agaricus against Psalliota or vice versa have so far been considered superfluous.

Several origins of Agaricus have been proposed; It possibly derives "from Agarica of Sarmatica, a district of Russia" (!). Note also Greek ἀγαρικ[3]όν "a sort of tree fungus" (There's been an Agaricon Adans. genus, treated by Donk in Persoonia 1:180)

Donk reports Linnaeus' name is devalidated (so that the proper author citation apparently is "L. per Fr., 1821") because Agaricus was not linked to Tournefort's name (Linnaeus places both Agaricus Dill. and Amanita Dill. in synonymy), but truly a replacement for Amanita Dill., which would require that A. quercinus, not A. campestris be the type. This question compounded by the fact that Fries himself used Agaricus roughly in Linnaeus' sense (which leads to issues with Amanita), and that A. campestris was eventually excluded from Agaricus by Karsten and was apparently in Lepiota at the time Donk wrote this, commenting that a type conservation might become necessary[4].

The alternate name for the genus, Psalliota, derived from the Greek psalion/ψάλιον, "ring", was first published by Fries (1821) as trib. Psalliota. The type is Agaricus campestris (widely accepted, except by Earle, who proposed A. cretaceus). Paul Kummer (not Quélet, who merely excluded Stropharia) was the first to elevate the tribe to a genus. Psalliota was the tribe containing the type of Agaricus, so when separated, it should have caused the rest of the genus to be renamed, not what happened. It seems to be currently not considered valid, or a junior homotypic synonym, anyway the explanation is that it was raised by (in retrospect) erroneously maintaining the tribe name[4].

[edit] Edibility

The genus contains the most widely consumed and best known mushroom today, Agaricus bisporus, with A. campestris also well known. The most notable inedible species is the yellow-staining mushroom A. xanthodermus. All three are found worldwide.

One species reported from Africa, A. aurantioviolaceus, is reportedly deadly poisonous.

[edit] List of species


[edit] See also

[edit] Footnotes

  1. ^ Bas C (1991). A short introduction to the ecology, taxonomy and nomenclature of the genus Agaricus, 21-24. In L.J.L.D. Van Griensven (ed.), Genetics and breeding of Agaricus. Pudoc, Wageningen, The Netherlands.
  2. ^ Capelli A (1984). Agaricus. L.: Fr. (Psalliota Fr.). Liberia editrice Bella Giovanna, Saronno, Italy
  3. ^ Letter is script and looks like a Russian и.
  4. ^ a b Donk, M.A. (1962). "The generic names proposed for Agaricaceae". Beiheifte zur Nova Hedwigia 5: 1-320. ISSN 0078-2238. 

[edit] External links