Abstract
This lake, the largest in the British Isles, in an area with an annual rainfall of 30 in., is subject to winter flooding and is surrounded by areas of fenland quite distinct from the prevalent acid moors of Ireland. The floods are supposed to act as a buffer solution preventing the development of acidity in all sections flooded. On higher levels acid moors develop. The sp. of the aquatic, fen, and can* associations are listed, and comparisons are made with the flora of similar associations in East Anglia, England.

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