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{{Taxobox
| color = lightblue
| name = ''Panaeolus acuminatus''
| image = Panaeolus_acuminatus.jpg
| regnum = [[Fungi]]
| phylum = [[Basidiomycota]]
| classis = [[Hymenomycetes]]
| ordo = [[Agaricales]]
| familia = [[Bolbitiaceae]]
| genus = ''[[Panaeolus]]''
| species = '''''P. acuminatus'''''
| binomial = ''Panaeolus acuminatus''
| binomial_authority = ([[Jacob Christian Schäffer|Schaeffer]]) [[Lucien Quélet|Quélet]] 1874
| synonyms = ''Panaeolus rickenii''
}}
{{mycomorphbox
| name = Panaeolus acuminatus
| whichGills = adnexed
| capShape = convex
| hymeniumType=gills
| stipeCharacter=bare
| ecologicalType=saprophytic
| sporePrintColor=black
| howEdible=unknown
}}
'''''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 [[Manure|dung]] and has black [[spore]]s. It has a cap that is less than 4 [[Centimetre|cm]] across, [[hygrophanous]], [[conic]] to campanulate to plane, usually with an [[umbo]]. The [[Lamella (mycology)|gill]]s are dark purplish black, crowded, with several tiers of intermediate gills.
== 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.
== External links ==
* [http://mushroomobserver.org/900 Mushroom Observer - ''Panaeolus acuminatus'']
* [http://mushroomobserver.org/2131 Mushroom Observer - ''Panaeolus acuminatus'']
[[Category:Panaeolus]]
{{Basidiomycetes-stub}}