Cladonia coniocraea (Common Powderhorn) is grey-green, slender, wand-like lichen.  Run your finger along the stalk and then look at your finger to see the powdery propagules produced along its length.  Widespread and often very common on mossy trunks and rotting stumps and logs\, this minty-green lichen starts life as a small leaf-like squamule – when it gets enough energy, it sends up the powdery stalk.