Rare 'frost beard' ice formation discovered by a hiker Capillary ice, a rare winter phenomenon formed by Exidiopsis effusa fungi, amazed a hiker during a walk in freezing January.

Rare ‘frost beard’ ice formation discovered by a hiker: The winter chill in early January surprised many across England this year. On January 11, 2025, a casual walk through the Devil’s Punch Bowl turned into a moment of astonishment.

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