158 Origin of the British Flora. 



Preglacial (Cromer Forest-bed) : — 



Beeston, Sidestrand, Mundesley, in Norfolk ; Pakefield, 

 Gorton, in Suffolk. 



POTAMOGETON PECTINATUS, L. 

 Neolithic : — 



Cowden Glen, Renfrewshire. 



Late Glacial : — 



Hoxne, Suffolk (bed C). 



Preglacial (Cromer Forest-bed) : — 



Common at most localities — drupes often very large. 



POTAMOGETON FILIFORMIS, Nolte. 

 Unknown fossil in Britain. 



Recorded from Gotland in the Dryas, Birch, and Pine 

 Zones (Gunnar Andersson). 



RUPPIA MARITIMA, L. 

 Interglacial : — 



West Wittering, Sussex ; Stone, Hampshire. 

 Recorded from the Pine and Oak Zones in Sweden 

 (Gunnar Andersson). 



Zannichellia palustris, L. 

 Late Glacial : — 



Twickenham, Middlesex. 

 Interglacial : — 



Stone, Hampshire; Selsey, Sussex; Endsleigh Street, 

 London; Southelmham, Suffolk; Hoxne, Suffolk (bed E); 

 Kilmaurs, Ayrshire. 



