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). 
