Hair ice, also called silk frost, is a type of ice formation that looks like silk and seems to only appear on woody, barkless materials on the ground. The ice structures tend to grow out of a small pore in the wood, sort of like hairs on the human head. Dr. James Carter has more on the phenomenon (and more photos too) on his site.
Link
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http://candyaddict.com/blog/2008/11/11/candy-review-montreal-dragons-beard-candy/