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In British folklore ancient, hollow oak trees that stood in old sacred groves were often believed to be the homes of elves or fairies. Such trees were called bull oaks in England, and bell oaks in Scotland and Ireland. You were supposed to turn your coat or cloak inside out to neutralize their magic:
“Turn your clokes
For fairy folks
Are in old oakes.”
Any oak tree may provide a home to fairies, elves, or other such beings. Dryads are oak tree nymphs. (Also see Hawthorn)
Hammarbya paludosa is called Green Fairy Orchid.