A lowland district of eastern England west and south of the Wash. Early attempts by the Romans to drain the area were abandoned by Anglo-Saxon times. Modern-day reclamation of the Fens began in the 1600s.
He constructed "Morton's Dyke" across the fens from Wisbech to Peterborough, repaired the episcopal palace at Hatfield and the school of canon law and St Mary's Church at Oxford.
Obviously no more than this is possible until physiologists are able to state much more precisely than at present what is the influence of common salt on the plants of salt-marshes, of the action of calcium carbonate on plants of calcareous soils, and of the action of humous compounds on plants of fens and peat moors.
~rphytes, grow in soils which contain an abundance of free imous compounds, and include plants which grow on fens and le .oors.
He latter are mixed associations, such as fens, where different :cies are produced by the varying abundance of characteristic ants, such as Cladium Mariscus, Phragmites communis, Molinia~ erulea, Calamagrostis lanceolata, and Juncus obtusiftorus.
Physically wet but physiologically dry ha bit ats,f with the accompanying plant communities of fens, moors, and salt marshes.