Coprinopsis nivea is a small inkcap mushroom which grows in wetland environments.
Cap: 1.5–3 cm. Starts egg shaped expanding to become campanulate (bell shaped). Covered in white powdery fragments of the veil when young. Gills: Start white before turning grey and ultimately black and deliquescing (dissolving into an ink-like black substance). Crowded and adnate or free. Stem: 3–9 cm long and 4-7mm in diameter. White with a very slightly bulbous base which may present with white tufts similar to that of the cap. Spore print: Black. Spores: Flattened ellipsoid and smooth with a germ pore. 15-19 x 8.5-10.5 μm. Taste: Indistinct. Smell: Indistinct.[7][8]
Etymology
The specific epithetnivea (originally niveus) is Latin for snowy or snow covered.[9] This is a reference to the powdery white appearance of this mushroom.
Habitat and distribution
Grows in small trooping or tufting groups on old dung, especially that of cows[10] and horses, Summer through late Autumn. Widespread and recorded quite regularly.[7]
^Redhead SA, Scott A; Vilgalys R; Moncalvo J-M; Johnson J; Hopple JS; Hopple, John S; Johnson, Jacqui; Moncalvo, Jean-Marc; Vilgalys, Rytas (2001). "Coprinus Pers. and the disposition of Coprinus species sensu lato". Taxon. 50 (1): 203–241. doi:10.2307/1224525. JSTOR1224525.