Water spilling off a tree stump had coated and frozen around these mushrooms, giving them a glaze. I believe they may be Oyster Mushrooms (Pleurotus ostreatus), or another Pleurotus species. The gills make a pleasing pattern:
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.