Flora of Scottish Lakes. 
115 
1909-10.] 
antipyretica, F. squamosa, and Potamogeton polygonifolius, all abundant ; 
particularly so at the S.W. side were Potamogeton polygonifolius, Castalia 
speciosa, and Nymphaea lutea. The semi-aquatic plants of the littoral zone 
were — Carex filiformis, very abundant, and replacing C. rostrata to a 
considerable extent (fig. 19), Carex Goodenovii, Heleocharis palustris, 
Hydrocotyle vulgaris, Ranunculus Flammula, Juncus lamprocarpus, J. 
eff'usus, and Caltha palustris, all very abundant, whilst the following were 
less abundant — Carex rostrata, C. flava, var. lepidocarpa, Phragmites 
communis, Menyanthes trifoliata, Equisetum limosum, Galium palustre, and 
Stachys palustris. The following Algse were very abundant — Batracho- 
spernum vagum, species of Zygnema, Spirogyra, and Ulothrix, particularly 
Ulothrix mqualis, var. catseniformis, with which submersed Phanerogams, 
etc. were thickly covered. The water of some of the little creeks was 
tinged with Oscillatoria. Masses of gelatinous diatoms such as Dickieia were 
abundant at the S.W. side, where also Sphagnum cuspidatum was plentiful. 
Many of the shore rocks were covered with a luxuriant growth of lichens, 
particularly with Parmelia omphalodes. Noteworthy also was the abun- 
dance of Bryophytes upon the littoral rocks and in damp places. The most 
important of these were — Blindia acuta, Fontinalis antipyretica, F. squamosa, 
Dicranella squarrosa, D. heteromalla, Rhacomitrium aciculare, Hyocomium 
flagellare, Pterygophyllum lucens, Heterocladium heteropterum, Sphagnum 
cuspidatum, and other species, Hedwigia ciliata, Dicranum Scottianum, D. 
fuscescens, Minium hornum, M. punctatum, Scapania undulata, S. purpur- 
escens, Marsupella emarginata, Pellia calycina, P. epiphylla, Kantia tricho- 
manes, var. aquatica, Chiloscyphus polyanthos, Diplophyllum albicans, 
Cephalozia bicuspidata, etc. 
Loch Stroan. — The Airie Burn, which flows from the north-east corner 
of Loch Skerrow, joins the River Dee after flowing northwards for about 
2 miles (figs. 20-22). Thence the Dee, impetuous nearer its source, slowly 
meanders eastwards, deep and wide, through an alluvial flat for about a 
mile and a half, and then it flows into Loch Stroan. 
This loch is about 230 feet above sea level, and its north-west shore 
consists chiefly of sandy or muddy flats, the result of detrital matter 
brought into it by the River Dee ; this is continuous with the extensive 
alluvial flat through which the river flows before entering the loch, and is 
overgrown near the water with Carex rostrata, etc. Farther away from the 
loch the drier portions are covered with moorland herbage of the grass-like 
type — Molinia cserulea, Scirpus csespitosus, Deschampsia csespitosa, etc. Else- 
where the shores of the loch are stony or rocky, with a gentle inclination, 
and merge gradually into grassy or heathery moor (figs. 23, 24). Although 
