wet dead wood in 1918, assuming some specific fungi as the catalyst, a theory mostly confirmed by Gerhart Wagner and Christian Mätzler in 2005. In 2015, the fungus Exidiopsis effusa was identified as key to the formation of hair ice.

Formation

Hair ice forms on moist, rotting wood from broadleaf trees when temperatures are slightly under 0 C and the air is humid. The hairs appear to

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