Montagnea arenaria, commonly known as the gasteroid coprinus, is a species of secotioid fungus in the family Agaricaceae. Originally named Agaricus arenarius by Augustin Pyramus de Candolle in 1815, it was transferred to the genus Montagnea by Sanford Myron Zeller in 1943. The species is characterized by a cap that has an apical disc up to 5 centimetres (2 in) wide, radial gills, a hymenophore, and spores with a prominent germ pore. It is inedible.

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