1909-10.] 
Flora of Scottish Lakes. 
85 
inches long occurred in the shallow water, normal forms being 
abundant in the deeper water. The var. fluvialis, Lange and Mort., 
occurs in deep water at Burntisland Reservoir, Lismore, etc. 
Potamogeton filiformis, Pers. ( = P. marinus, L. ?). “II.,” VII. Fre- 
quently abundant, particularly so at Loch Fitty, where in some 
places the ripe fruits of this plant, with those of P. pusillus and P. 
pectinatus, washed up on the shore, formed a considerable stratum. 
The var. alpina, Blytt, is plentiful in Loch Geliy. 
Potamogeton flabellatus, Bab. ( = P. interruptus, Kit). VII. Very 
abundant in Town Loch, Dunfermline. 
Potamogeton pectinatus, L. VII. Scarce, but plentiful in Lochs 
Geliy, Fitty, Kilconquhar, etc. [VI. Rare. Ravenstone Loch, 
near Sorbie. — J. M‘A.] It is abundant in Duddingston Loch, near 
Edinburgh. 
Mr A. Bennett kindly examined a number of difficult forms of 
Potamogeton for me. 
CYPERACEiE. 
Schoenus nigricans, L. VI. About the peaty shores of lochs, not 
common, nor often abundant. [Frequent in damp places along the 
seashore of Wigtownshire. — J. M £ A.] 
Cladium Mariscus, Br. VI. Very abundant about lochs in the Mochrum 
district. On Anabaglish Moss several small lochans are entirely 
surrounded by it (figs. 62-64). 
Rhynchospora alba, Vahl. IV., VI. Sometimes abundant on shores of 
boggy peat ; a very common moorland plant in these Areas. 
Heleocharis palustris, Br. “ I., II., III.,” IV., V., VI., VII. Ubiquitous 
and variable; sometimes it grows 3 feet high, as at White Loch, 
Castle-Kennedy, at other places less sheltered from wind it only 
grows a few inches high. One such dwarf form, with short, stout, 
very scaly rhizomes, and few flowering stems, which were about 4 
inches high, was overgrowing an exposed sandy shore at Loch 
Grennoch. H. uniglumis, Schultes , occurs at the Isle of May in pools 
(figs. 98, 121, etc.). 
Heleocharis multicaulis, Sm. IV., V., VI. Sometimes abundant in the 
more or less peaty lochs, where the leaves often float on the surface, 
and are occasionally viviparous at the extremities (fig. 68). 
Heleocharis acicularis, Br. IV., VI., VII. Not a common plant, but 
occasionally abundant. It forms a sward on the wet sandy or muddy 
shores of lochs, and enters the water to a depth of about a foot ; 
