Panaeolina castaneifolia

Panaeolina castaneifolia

Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Bolbitiaceae
Genus: Panaeolus
Species: P. castaneifolia
Binomial name
Panaeolina castaneifolia
(Murrill) Bon
Panaeolina castaneifolia
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium

cap is campanulate

or convex

hymenium is adnexed

or adnate
stipe is bare
spore print is blackish-brown
ecology is saprotrophic
edibility: unknown

Panaeolina castaneifolia is a rare and widely distributed little brown mushroom that may contain the hallucinogen psilocybin.

It has dark brown, coarsely roughened spores which resemble those of Panaeolina foenisecii.


  • Cap: 2 — 4 cm, often with small wrinkles, hygrophanous, dark brown when moist drying to ochre buff. Often with a darker zone around the margin as it dries.
  • Gills: Broad, not crowded, adnexed, dark brown.
  • Stipe: 4 — 6 cm x 4 — 6 mm, pruinose, cartilaginous, the same color as the cap or pale ochre.
  • Spores: Dark purplish brown, rough. 12 — 16 x 7 — 9 micrometers, almond shaped, verrucose, with small germ pore.
  • Odor: Rather strong.
  • Taste: Unpleasant.
  • Microscopic features: Basidia four spored, pleurocystidia look like basidia and are dark brown, cheilocystidia abundant, fusoid-ventricose or subcylindric.

Habitat and formation

Panaeolina castaneifolia grows in along roadsides and grassy fields. This species was first found in New York City and is probably more widely distributed. This mushroom is often mistaken for Panaeolina foenisecii, and has similar microscopic features but can be distinguished by its thicker stem and more unpleasant taste. It also resembles Panaeolus subbalteatus and can be distinguished from that species by its roughened brown spores.


External links

  • Mycologia - Panaeolus castaneifolia description by AH Smith
  • Mycologia - Original description as Psilocybe castaneifolia
  • Rough Spored Panaeoloideae spore comparison