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, Longe 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 Gelly. 



Potamogeton flabellatus, Bah. ( = P. interruptus, Kit.). VII. Very 

 abundant in Town Loch, Dunfermline. 



Potamogeton pectinatus, L. VII. Scarce, but plentiful in Lochs 

 Gelly, 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. 



CYPERACE^. 



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, VaJd. IV., VI. Sometimes abundant on shores of 

 boggy peat ; a very common moorland plant in these Areas. 



Heleocharis palustris, Br. " L, 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 ; 



