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Water Fern

Water Fern covering a rhyne, Somerset Levels
Closer view
Closer view of fronds
Close-up of frond with overlapping leaves
Large fern cells and chains of Anabaena cells
(the larger oval cells are heterocysts and the
smaller squarer ones are vegetative)
 Chains of Anabaena cells and a large fern 
    transfer cell       
Water Fern and Common Duckweed on the
         Lancaster Canal