Check out this amazing picture of hair ice. It was posted on the local TV station’s web site, and is from the Olympic forest nearby Seattle.
Hair ice forms on moist, rotting wood from broadleaf trees when temperatures are slightly under 0 °C (32 °F) and the air is humid. Swiss and German researchers found that the fungus ‘Exidiopsis effusa’ in the wood, as key to the formation of hair ice.