''Panaeolus papilionaceus'', also known as ''Agaricus calosus'', ''Panaeolus campanulatus'', ''Panaeolus retirugis'', and ''Panaeolus sphinctrinus'', and commonly known as Petticoat mottlegill, is a very common and widely distributed little brown mushroom that feeds on dung. This mushroom is the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...

for the genus ''

Panaeolus ''Panaeolus'' is a genus of small, black-spored, saprotrophic agarics. The word ''Panaeolus'' is Greek for "all variegated", alluding to the spotted gills of the mushrooms produced. Characteristics These fungi are mostly dung and grassland sp ...

''.

Description

*Cap: 1–5 cm across, obtusely conic, grayish brown, not

hygrophanous The adjective hygrophanous refers to the color change of mushroom tissue (especially the pileus surface) as it loses or absorbs water, which causes the pileipellis to become more transparent when wet and opaque when dry. When identifying hygrop ...

, becoming

campanulate This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...

in age, margin adorned with white toothlike

partial veil In mycology, a partial veil (also called an inner veil, to differentiate it from the "outer", or universal veil) is a temporary structure of tissue found on the fruiting bodies of some basidiomycete fungi, typically agarics. Its role is to isolate ...

fragments when young or towards the edge, flesh thin. *Gills:

adnate Adnate may refer to: * Adnation, in botany, the fusion of two or more whorls of a flower * Adnate, in mycology, a classification of lamellae (gills) * Conjoined twins Conjoined twins – sometimes popularly referred to as Siamese twins – are ...

adnexed In mycology, a lamella, or gill, is a papery hymenophore rib under the cap of some mushroom species, most often agarics. The gills are used by the mushrooms as a means of spore dispersal, and are important for species identification. The atta ...

close to crowded, one or two tiers of intermediate gills, pale gray, acquiring a mottled, blackish appearance in age, with whitish edges. *Spores: 12–18 x 7–10

µm The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ...

, elliptical, smooth, with an apical pore, spore print black. *Stipe: 6–12 cm by 2–4 mm, gray-brown to reddish brown, darker where handled, paler toward the apex, brittle, fibrous, and

pruinose Pruinescence , or pruinosity, is a "frosted" or dusty-looking coating on top of a surface. It may also be called a pruina (plural: ''pruinae''), from the Latin word for hoarfrost. The adjectival form is pruinose . Entomology In insects, a "blo ...

. *Odor: Mild. *Taste: Unappetizing. *Microscopic features: Basidia 4-sterigmate; abruptly clavate. Cheilocystidia abundant; subcylindric, often subcapitate or capitate.

Habitat and formation

Occurring singly, gregariously, or caespitosely on cow/horse dung, moose droppings, and in pastures. Widely distributed in North America throughout the year, but only in warmer climates in winter. It can be found in countries includingWorldwide Distribution of Neurotropic Fungi, Guzman (www.museocivico.rovereto.tn.it)
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Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

(

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British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...

), the United States (

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, Alaska,

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,''Panaeolus papilionaceus''
The Mushroom Observer (mushroomobserver.org)]

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), the Caribbean (

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, San Vincent Island),

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, and the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

Edibility

''Panaeolus papilionaceus'' is inedible, and is neither choice in flavor nor substantial in mass. While similar looking species, such as ''

Panaeolus cinctulus ''Panaeolus cinctulus'', syn. ''Panaeolus subbalteatus'', commonly known as the banded mottlegill, weed Panaeolus or is a very common, widely distributed psilocybin mushroom. According to American naturalist and mycologist David Arora, ''Panaeolus ...

'', do contain

psilocybin Psilocybin ( , ) is a naturally occurring psychedelic prodrug compound produced by more than 200 species of fungi. The most potent are members of the genus ''Psilocybe'', such as '' P. azurescens'', '' P. semilanceata'', and '' P.&nbs ...

, ''Panaeolus papilionaceus'' does not.

Gallery

File:Panaeolus.Papilionaceus.001.jpg, ''Panaeolus papilionaceus var. papilionaceus '' Image:2011-08-31_Panaeolus_papilionaceus_(Bull.)_Qu%C3%A9l_183735.jpg Image:Panaeolus.sphinctrinus2.-.lindsey.jpg Image:Panaeolus papilionaceus 20080913w.jpg File:Panaeolus.papilionaceus3.-.lindsey.jpg

References

External links

Mushroom Expert - ''Panaeolus papilionaceus''

Observations
on

Mushroom Observer Mushroom Observer is a collaborative mycology website started by Nathan Wilson in 2006. Reproduced on thMykoWeb website. Its purpose is to "record observations about mushrooms, help people identify mushrooms they aren't familiar with, and expand th ...