Most often found in cool, mature cedar swamps or on slopes of mixed coniferous growth underlain by some type of calcareous bedrock. At all known Maine stations but one, CALYPSO is associated with northern white cedar (THUJA OCCIDENTALIS). In the Rockies, CALYPSO prefers dry coniferous slopes. This element prefers moderate to well-drained sites with little herbaceous competition, wherever it grows - even in THUJA swamps it is usually found growing up on ridges, cedar butts, upon decaying logs or on gentle slopes.
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