Amanita islandica

Amanita islandica is a species of basidiomycete fungus in the family Amanitaceae, first described in 1992 from specimens collected in Iceland. The delicate, predominantly white mushroom made by the fungus is characterised by its conical to convex cap measuring 6–8 centimetres across, exceptionally tall and slender stipe up to 20 centimetres in height, and distinctive sack-like cup at the base, while lacking the ring around the stem that many other Amanita species have. Native to subarctic and northern European regions, it forms ecological partnerships with birch trees in Iceland and has also been found in Swedish forests growing among birch and spruce, typically in wet, mossy areas....read more on Wikipedia.