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Fens

A peat accumulating wetland that receives groundwater input from surrounding or underlying mineral soil.

Fens have a higher nutrient content than bogs, contain significant amounts of calcium, magnesium and other nutrients
Support a high diversity of plant species
pH circumneutral to basic due to groundwater inputs
Often dominated by graminoid species (grasses and sedges)
Northern white-cedar swamps are a type of fen dominated by this tree (Thuja occidentalis)