Abstract
The fens described lie 250 m. above sea level in N. England. They surround Sunbiggin Tarn, a small lake fed from limestone springs and containing water at pH 8. Phragmites communis and Carex rostrata are the chief colonists of open water, and the latter is the general dominant of the lower fens. Higher levels support a mixed fen in which Filipendula -ulmaria is often very prominent. The relation of the vegetation to water flow and water level is discussed, and some suggestions made about possible geographical variations in British fen vegetation.

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