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Proceedings of the Royal Society of Edinburgh. [Sess. 
is more or less peaty. In lowland non-peaty lochs that receive the 
drainage from cultivated land, M. spicatum as a rule takes its place. 
It is exceptional to find the two species in the same water. 
Myriophyllum spicatum, L. “ II.,” V., VI., VII. Abundant where the 
water is not peaty ; see remarks on the preceding species. 
CALLITRICHACEflE. 
Callitriche vernalis, Koch ( — C. palustris, L.). VI., VII. Rare at the 
lochs, but it sometimes occurs in sheltered bays or in shore pools. 
Callitriche stagnalis, Scop. “ I., III.,” IV., V., VI., VII. Terrestrial and 
aquatic forms are rather common in shallow places and pools about 
the shores of non-peaty lowland lochs. When growing on a muddy 
or sandy shore the plants are rather sturdy, and form sward-like, 
spreading tufts. When submersed they are weaker, with leaves and 
internodes elongated. 
Callitriche hamulata, Kutz. ( = C. intermedia , Hojfm.). “ I., III.,” IV., 
V., VI., VII. Widely distributed in peaty lochs, but nowhere so 
generally abundant as in Area I. It is usually found without the 
floating rosettes, but in a few places, Loch Stroan for example, the 
two forms occur. When rosettes are present, the floating, spathulate, 
apical leaves gradually become transformed downwards into the 
linear type, and from about 3 inches below the apex all the lower 
leaves are linear and emarginate, as in the form without the floating 
rosettes. 
Callitriche autumnalis, L. V., VI., VII. This fine species is widely 
distributed in non-peaty lowland lochs, and is frequently very 
abundant. At Soulseat Loch, for example, this plant and Ranun- 
culus circinatus are the only submerged Phanerogams that are 
plentiful. Again, at Carlingwark and Kilconquhar Lochs, notwith- 
standing strenuous competition by more robust rivals, this plant 
maintains a dominance over certain portions of the bottom. This 
species varies somewhat in the form of leaf and fruit. 
PORTULACEflE. 
Montia fontana, L., and its aquatic form, var. rivularis, Gemel. “ I., 
II.,” V., VI., VII. A very common plant about the shores of some of 
the less peaty lochs in both aquatic and terrestrial forms. 
SAXIFRAGACEdE. 
Parnassia palustris, L. “I., II.,” IV., [V., VI. — J. MW.], VII. Occasion- 
ally represented on boggy shores. 
