Mycena adscendens

About

Mycena adscendens, commonly known as the frosty bonnet, is a species of fungus in the family Mycenaceae. The fungus produces small white fruit bodies (mushrooms) with caps up to 7.5 mm (0.3 in) in diameter that appear to be dusted with sugar-like granules. Caps are supported by thin, hollow stems up to 20 mm (0.8 in) long, which are set on a disc-like base. Its distribution includes Europe, Turkey and the Pacific coast of the United States. The fruit bodies grow on fallen twigs and other woody debris on the forest floor, including fallen hazel nuts. The variety carpophila is known from Japan. There are several small white Mycena species that are similar in appearance to M. adscendens, some of which can be reliably distinguished only by examining microscopic characteristics.

Summary from Wikipedia