{{Short description|Species of fungus}} {{Speciesbox | image = Agaricus inapertus 171175.jpg | image_caption = | taxon = Agaricus inapertus | authority = Vellinga (2003) | synonyms_ref = <ref name="urlMycoBank: Agaricus inapertus"/> | synonyms = {{Specieslist |Endoptychum depressum|Singer & A.H.Sm. (1958) }} }} '''''Agaricus inapertus''''', commonly known as the '''mountain gasteroid agaricus''',<ref name="Arora1986">{{Cite book |last=Arora |first=David |author-link=David Arora |url=https://archive.org/details/arora-david-mushrooms-demystified-a-comprehensive-guide-to-the-fleshy-fungi-ten-speed-press-1986/page/730/mode/2up |title=Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi |publisher=Ten Speed Press |year=1986 |isbn=978-0-89815-170-1 |edition=2nd |location=Berkeley, California |pages=730–31 |orig-date=1979}}</ref> is a species of secotioid fungus in the genus ''Agaricus''. It was first described by American mycologists Rolf Singer and Alexander H. Smith in 1958 as ''Endoptychum depressum''.<ref name=Singer1958/> Molecular analysis later proved it to be aligned with ''Agaricus'', and it was formally transferred in a 2003 publication.<ref name=Vellinga2003/>

The cap grows up to {{Convert|15|cm|frac=4}} wide. It is whitish, staining yellowish.<ref name="Arora1986" /> A veil joins the cap margin to the stem, which is up to about 4&nbsp;cm long. The flesh is whitish and toughens in age.<ref name="Arora1986" /> The spores are contained on rudimentary gills, initially appearing pallid then brown.<ref name="Arora1986" /> A spore print is unobtainable. It is related to species in ''Agaricus'' sect. ''Arvenses''.<ref name="Arora1986" />

The species grows with conifers in western North America.<ref name="Arora1986" /> Firm specimens have been said to be edible.<ref name="Arora1986" />

==See also== * List of ''Agaricus'' species

==References== {{Mycomorphbox | name = ''Agaricus inapertus''{{italic title}} | hymeniumType = gills | capShape = convex | whichGills = no | stipeCharacter = bare | stipeCharacter2 = ring | ecologicalType = saprotrophic | sporePrintColor = blackish-brown }}{{Reflist|refs=

<ref name=Singer1958>{{cite journal |vauthors=Singer R, Smith AH |title=Studies on secotiaceous fungi. II. ''Endoptychum depressum'' |journal=Brittonia |year=1958 |volume=10 |issue=4 |pages=216–221 |doi=10.2307/2804952|jstor=2804952 |s2cid=11238347 }}</ref>

<ref name="urlMycoBank: Agaricus inapertus">{{cite web |url=http://www.mycobank.org/MycoTaxo.aspx?Link=T&Rec=466018 |title=''Agaricus inapertus'' Vellinga 2003 |publisher=MycoBank. International Mycological Association |access-date=2011-09-28}}</ref>

<ref name=Vellinga2003>{{cite journal |vauthors=Vellinga EC, de Kok RP, Bruns TD |title=Phylogeny and taxonomy of ''Macrolepiota'' (Agaricaceae) |journal=Mycologia |year=2003 |volume=95 |issue=3 |pages=442–456 |doi=10.2307/3761886 |jstor=3761886 |url=http://www.cybertruffle.org.uk/cyberliber/59350/0095/003/0442.htm |pmid=21156633|url-access=subscription }}</ref>

}}

==External links== * {{IndexFungorum|466018}}

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inapertus Category:Fungi described in 1958 Category:Fungi of North America Category:Secotioid fungi Category:Fungus species