Panaeolus acuminatus
Panaeolus acuminatus, also known as Panaeolus rickenii is a common little brown mushroom.

This species contains small amounts of serotonin, 5-HTP, and tryptophan.

Description 
This is a little brown mushroom that grows on grass and dung and has black spores. It has a cap that is less than 4 cm across, hygrophanous, conic to campanulate to plane, usually with an umbo. The gills are dark purplish black, crowded, with several tiers of intermediate gills.  The spores are (11) 13 - 15 (17) x 9 - 11 (12) x (6.5) 7 - 8 (9) micrometers, smooth, black, and shaped like lemons.  Cheilocystidia present.

Habitat and distribution 
Panaeolus acuminatus is a mushroom that grows in grass and in dung. It has been found throughout North America and Europe and is very widely distributed.

See also

List of Panaeolus species

References

External links
 Mushroom Observer - Panaeolus acuminatus
 Mushroom Observer - Panaeolus acuminatus

acuminatus
Fungi of Europe
Fungi of North America
Fungi described in 1874