Former Distribution of British Plants. 169 



Equisetum limosum, Sm. 



Though fragments possibly belonging to this species 

 are not uncommon in peaty deposits in Britain, I have 

 seen no determinable specimens. 



Recorded from Lauenburg an der Elbe (Keilhack). 



Equisetum hyemale, L. 



Unknown fossil in Britain. 



Recorded from the Pine Zone in Norrland, in Sweden, 

 in calcareous tufa (Nathorst); and from Gotland (Gunnar 

 Andersson). 



ISOETES LACUSTRIS, L. 

 Neolithic : — 



Hailes, near Edinburgh; Cowden Glen, Renfrewshire. 



Late Glacial : — 



Garvel Park (Clyde Beds), (J. B. Balfour) ; Hailes, near 

 Edinburgh (lower beds) ; Gayfield, Edinburgh. 



Interglacial : — 



Allenton, near Derby; Kilmaurs, Ayrshire; Faskine, 

 Lanark ; Airdrie, Lanark. 



Early Glacial : — 



Beeston, Norfolk (base of Arctic Fresh-water-bed). 



Preglacial (Cromer Forest-bed) : — 



Beeston, Norfolk (a single specimen, perhaps from the 

 Early Glacial bed above, which here rests immediately on the 

 Cromer Forest-bed). 



