Chlorociboria aeruginascens - Sporocarps of 2 to 15 mm in diameter, initially cup-shaped, with age becoming more flattened and disk-like, and sometimes completely irregular and may be slightly branched; green-blue, although the inner surface is initially whitish; supported by a short, usually central (or almost central) handle; surface smooth or slightly wrinkled. Mycelium-overgrown wood has a color such as the fruiting body.
Greenish, green-blue flesh, without any special taste or smell.
Occurrence: On decayed, rotten, often deciduous trunks of bark, especially oaks; quite common; sporocarps grow out in the cold season, from late summer to autumn, and sometimes even during warmer winters.
Value: Inedible mushroom.