Mycena adonis.

''Mycena adonis'', commonly known as the scarlet bonnet, is a species of fungus in the Mycenaceae family. Found in Asia, Europe, and North America, it produces small orangish to reddish inedible mushrooms with caps up to 1.2 cm in diameter, held by thin pinkish-white stems reaching 4 cm long. The fungus prefers to grow in conifer woods and peat bogs, suggesting a preference for acidic environments. The appearance of several atypical fruitings of ''Mycena adonis'' on deciduous wood in the Netherlands.. more