Hoar Frost and Angel Hair

Did you know that angel hair frost is caused by a fungus? No – we didn’t either…. Researchers found out in 2015 that the peculiar ice crystals found on moist, rotting wood is created by the fungus Exidiopsis effus. When the conditions are right – the air is humid and temperatures are slightly below 0 °C – hair ice forms on moist, rotting wood from broadleaf trees.

Fi Keene took the photos below a few days ago:

“A really beautiful Exmoor morning today, with hoar frost on the trees catching the low rays of the rising sun, after a night with freezing fog. There was a lot of angel hair frost around, too, for which conditions have to be just right, with high humidity.”

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