Samiksha Jaiswal (Editor)

Panaeolus olivaceus

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Kingdom
  
Fungi

Order
  
Agaricales

Genus
  
Panaeolus

Higher classification
  
Panaeolus

Division
  
Basidiomycota

Family
  
Bolbitiaceae

Scientific name
  
Panaeolus olivaceus

Rank
  
Species

Panaeolus olivaceus filesshroomeryorgfiles1243114658265205305jpg

Similar
  
Panaeolus fimicola, Panaeolus, Panaeolus cinctulus, Gymnopilus luteus, Gymnopilus luteofolius

Panaeolus olivaceus


Panaeolus olivaceus (syn. Panaeolus castaneifolius) is a widely distributed, seldom identified, little brown mushroom that contains the hallucinogen psilocybin; it is often mistaken for Panaeolina foenisecii and is distinguished by its black spore print and darker gill coloration when mature alongside a slightly thicker stem. It is even more easily mistaken for Panaeolus cinctulus or Panaeolus fimicola and can be distinguished from them both by its slightly roughened spores. It is also easily confused with Panaeolina castaneifolia, a species which has spores that are dark brown and significantly more roughened.

Contents

Panaeolus olivaceus Shroomery Panaeolus olivaceus

Description

Panaeolus olivaceus Shroomery Panaeolus olivaceus

  • Cap: 1— 3(4) cm across, Distinctly campanulate then subhemispheric to convex, becoming broadly conic, not fully expanding, incurved margin when young, dark smoky-grayish to dark cinnamon, drying to a straw-yellow or slightly olive-gray color, remaining more reddish-brown towards the center, hygrophanous, smooth, sometimes striated or finely corrugated, flesh thick and firm.
  • Gills: Adnate to adnexed, close, thin, pallid, mottled, slightly olive-greenish, becoming dark purplish gray-black in age, edge whitish.
  • Stipe: 4— 6(7.5) cm by 3— 4(6) mm thick, equal to slightly tapering at the base, hollow, brittle, pruinose and slightly striate, no veil remnants. Grayish to ochraceous, tan or purple at the base.
  • Spores: Black, slightly roughened, 12 — 15(17) x 7 — 8.5(10) micrometers, elliptic, rugose or verrucose.
  • Microscopic features: Basidia 24 — 28 x 10 - 12 micrometers. Cheilocystidia (20)24— 30(38) x (5)7 — 10 micrometers, abundant, neck often flexuous and apices usually obtuse, thin walled and hyaline, pleurocystidia rare or absent, not projecting beyond plane of basidia.

    • Habitat and formation

    Panaeolus olivaceus Shroomery Panaeolus olivaceus

    Panaeolus olivaceus grows scattered to gregariously in rich grassy areas, from late summer through December, across North and South America, likely more widely distributed; it has been collected in the U.S. states of Washington, Oregon, Florida, Georgia, Canada's Quebec and in the United Kingdom.

    Panaeolus olivaceus Panaeolus olivaceus


    Panaeolus olivaceus FilePanaeolus olivaceus 2JPG Wikimedia Commons

    References

    Panaeolus olivaceus Wikipedia
    (Text) CC BY-SA