Paralepista flaccida

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Paralepista flaccida
var. inversa
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Tricholomataceae
Genus: Paralepista
Species:
P. flaccida
Binomial name
Paralepista flaccida
(Sowerby) Vizzini (2012)
Synonyms

Agaricus flaccidus Sowerby (1799)
Clitocybe flaccida (Sowerby) P. Kumm. (1871)
Lepista flaccida (Sowerby) Pat. (1887)
Agaricus inversus Scop. (1772)
Lepista inversa (Scop.) Pat. (1887)

Paralepista flaccida (also called Clitocybe flaccida, Clitocybe inversa, Lepista flaccida and Lepista inversa, or in English tawny funnel cap) is a species of mushroom found across the Northern Hemisphere. It is known to form fairy rings.[1]

Naming

Sowerby's illustration which is part of the original definition of P. flaccida

The naming history of this mushroom is complicated by the fact that for a long time it was regarded as two different species, "flaccida" (associated with broad-leaved trees) and "inversa" (associated with conifers and with a smoother shinier cap). These forms can still be differentiated as varieties within P. flaccida if desired.[2] The earliest description was by Giovanni Antonio Scopoli in 1772 as Agaricus inversus in his book Flora Carniolica,[3] then in 1799 James Sowerby created a description under the name Agaricus flaccidus in his major work "Coloured Figures of English Fungi or Mushrooms".[4] In later years there were defined the combinations Clitocybe flaccida (by Paul Kummer, 1871), Clitocybe inversa (by Lucien Quélet, 1872), and Lepista flaccida and Lepista inversa (by Narcisse Patouillard, 1887).[5] There followed long-standing confusion over whether Clitocybe or Lepista was the appropriate genus.

Using molecular analysis, in 2012 Alfredo Vizzini published a paper showing (with a detailed

Species Fungorum,[5] and the Global Biodiversity Information Facility,[8] but not necessarily in derivative databases such as the Encyclopedia of Life
.

Older mushroom references generally listed the flaccida and inversa forms as separate species,[9] but modern authorities merge them into one.[10][2][11][8][5]

In English P. flaccida is sometimes called the tawny funnel cap.[12]

Description

Var. flaccida
Paralepista flaccida
saprotrophic
Edibility is not recommended or edible

The following sections use the given references throughout.[13][10][11][9]

General

  • The cap grows up to 10 cm in diameter It is depressed in the centre or funnel-shaped when old and has a variable brownish colour which may be ochraceous, orange or reddish.
  • In the flaccida form the upper surface is matt and silky and the mushroom as a whole is flaccid. In the inversa form the surface is shiny and the mushroom is rigid.
  • The gills are decurrent and closely packed. They are a similar hue to the cap, but paler. The spore print is white or pale pink.
  • The stem is up to about 7 cm long and about 0.8 cm thick, a similar colour to the cap.
  • The smell is agreeably mushroomy and the taste is mild.

Microscopic characteristics

The spores are almost spherical with small spines or warts, about 4.5 µm in diameter. There are no distinctive cystidia. There is no microscopic difference between the flaccida and inversa forms.

Distribution, habitat & ecology

This fungus is a

saprobe growing on humus-rich soil, compost or conifer needles from summer to autumn. The flaccida form grows in deciduous woods and the inversa form under conifers. Often numerous mushrooms "fruit" together and it may form fairy rings
.

It is most frequent in Europe where it is common.[14][10] It also occurs in the U.S.A. and there have been reports of it from Mexico, and Australia.[8]

Similar species

Paralepista gilva

The inversa form is sometimes regarded as a separate species, in which case it is distinguished because it grows under conifers rather than broad-leaved trees, has a shinier cap surface, and is more rigid (less flaccid).

Both forms are closely allied to Paralepista gilva (also edible) which can be identified by its yellower cap and stem, and the presence of dark spots on the cap surface.[11] P. flaccida is also similar to the edible Infundibulicybe gibba which has thinner flesh, less crowded gills, and (microscopically) smooth teardrop-shaped spores.[2]

More worrying for consumers of this species is the resemblance to the poisonous Paralepistopsis amoenolens, which however seems to be limited in distribution to North Africa, southern France and southern Italy. P. amoenolens has a strong characteristic smell, a beige colour, and a less depressed cap; also the spores are smooth.[2]

Human uses

According to Marcel Bon this is a good edible mushroom,[13] but other commentators are less enthusiastic, regarding it as poor.[14][12] In relevant regions care should be taken to avoid confusion with Paralepistopsis amoenolens. At least one source says that it is not recommended for consumption.[15]


This thus mushroom has multiple chemical defenses. It contains a chlorinated lactone, 5-(chloromethyl)-3-methyl-2(5H)-furanone (clitolactone) that is a slug antifeedant. [16] In addition, it has a new insecticidal nitro nucleoside, clitocine. [17]


An article in Nature Communications reports that an extract of this mushroom, with active constituent 2,6-diaminopurine, can correct RNA

nonsense mutations and so may be a candidate to help treatment of certain genetic diseases.[18]

References

  1. ISBN 9789054106166
    .
  2. ^
    ISBN 978-2-7011-8289-6
    . On page 1078 of this reference is a note about the new genus Paralepista. The inversa form is separated at the level of a variety.
  3. ^ For the original inversa name, see "Agaricus inversus page". Species Fungorum. Royal Botanic Gardens Kew. Retrieved 2017-02-21.
  4. ^ Sowerby, James (1797). Coloured Figures of English Fungi or Mushrooms. London: J. Davis. pp. 316, pl. 185.
  5. ^ a b c For the original name and later ones, see "Paralepista flaccida page". Species Fungorum. Royal Botanic Gardens Kew. Retrieved 2017-02-25.
  6. phylogram
    which indicates the evidence that Paralepista forms a separate clade.
  7. ^ For Raithelhuber's contribution: Marcel Bon; Ercole E (1996). "NOVITATES (Suite) : Tricholomataceae (2) Sous-famille CLITOCYBOIDEAE". Documents Mycologiques (in French). 26 (102): 18. Archived from the original on 2017-11-07. Retrieved 2017-02-26..
  8. ^ a b c The main entry is at "Paralepista flaccida (Sowerby) Vizz..." Global Biodiversity Information Facility. GBIF. Retrieved 2017-02-24. The other flaccida and inversa synonyms can be searched for and are redirected to Paralepista flaccida, so it is clear that the latter is the current name.
  9. ^
    ISBN 0-9508486-0-3
    .
  10. ^
    ISBN 978-2-603-02038-8
    . Mentions that the flaccida form can optionally be separated. Also available in English.
  11. ^
    ISBN 978-87-983961-3-0
    .
  12. ^ a b Roger Phillips (1983). Mushrooms and other fungi of Great Britain & Europe. London: Book Club Associates. p. 48.
  13. ^
    ISBN 0-340-39935-X
    .
  14. ^ a b "Lepista flaccida (Sowerby) Pat. - Tawny Funnel". First Nature. Retrieved 2017-02-25.
  15. ISSN 0027-5514
    .
  16. doi:10.1080/15572536.2005.11832992
    .
  17. doi:10.1016/S0040-4039(00)94251-5
    .
  18. PMID 32198346
    .

External links

Wikimedia Commons has media related to Lepista flaccida.
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