Leucocoprinus flavipes
Leucocoprinus flavipes is a species of mushroom producing fungus in the family Agaricaceae. Taxonomy 
It was first described in 1888 by the French mycologists Narcisse Théophile Patouillard and Albert Gaillard who classified it as Leucocoprinus flavipes. In 1891 the species was included in Pier Andrea Saccardo's Sylloge fungorum omnium hucusque cognitorum as Hiatula flavipes resulting in the creation of this as a synonym. Description 
Leucocoprinus flavipes is a small white dapperling mushroom with thin flesh. Cap: 3-5cm wide and very thin, campanulate and flattening with age with an umbo or central disc. The surface is pure white and has striations running to the centre disc, which is smooth and greenish. Stem: 10-12cm tall and 3-5mm thick and brittle with a 10mm thick bulbous base. The surface is greenish yellow whilst the interior is hollow. The membranous stem ring is white and is movable but may disappear. Gills: Free with a wide collar, crowded and white. The gills are thin and delicate. Spore print: White. Spores: Subglobose with a large apical germ pore. No measurements are provided in the 1888 text and likely would not be accurate by modern standards if they were. Patouillard and Gaillard describe the mushroom as being very ephemeral and disappearing soon after the sun rises. They compare it to Coprinus though note it is not deliquescent and to Hiatula fragilissima (now known as Leucocoprinus fragillissimus). This species may be a synonym of L. fragillissimus that has not been reclassified or a similar species that has just been mostly forgotten. Habitat and distribution 
The specimens studied by Patouillard and Gaillard were found in humus on the edge of the woods on the left bank of the Orinoco river opposite Puerto-Zamuro in Venezuela. Similar species 

 Leucocoprinus fragillissimus

References 

flavipes
Fungi described in 1888