This is a vibrant green lichen when wet, but dull when dry. The podetia (stalk-like growths) are narrow and curved, and tapering to a point or a tiny cup. These can grow up to a height of 3cm.
Found on mossy, decaying tree stumps. Common and widespread throughout.
Photographs of Common Powderhorn (Cladonia coniocraea), taken April 2012 on rotting tree stump, local wood, Staffordshire. © Pete Hillman 2012. Camera used Panasonic Lumix DMC-FZ38.