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Conocybe aeruginosa is a species of mushroom producing fungus in the family Bolbitiaceae.

Taxonomy
It was first described in 1969 by the French mycologist Henri Romagnesi who classified it as Conocybe aeruginosa.

Reclassified as Pholiotina aeruginosa?

1891 by the German mycologist Paul Christoph Hennings who classified it as Lepiota magnusiana.

In 1943 it was reclassified as Hiatula magnusiana by the German mycologist Rolf Singer and then as Leucocoprinus magnusianus in 1949.

Description
Cap: 1-5cm wide, starting ovoid or cylindrical before expanding to campanulate (bell shaped) with thin flesh. The surface is white and covered in powdery scales whilst the centre discolours yellow with age and the cap edges are striated. Gills: Free, crowded and white. Stem: 2-7 cm tall and 2-3 mm thick with a white surface that discolours reddish and a hollow interior. The membranous stem ring has a woolly (floccose) texture. Spores: Ovoid. Smell: Indistinct.Taste: Indistinct.

Habitat and distribution
L. magnusianus is scarcely recorded and little known.