1909-10.] Flora of Scottish Lakes. 115 



antipyretica, F. squamosa, and Potaraogeton 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 (tig. 10), Carex Goodenovii, Heleocharis palustris, 

 Hydrocotyle vulgaris. Ranunculus Flannnula, Juncus lamprocarpus, J. 

 effusus, 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 Alga; were very abundant — Batracho- 

 spernum vagum, species of Zygnema, Spirogyra, and Ulothrix, particularly 

 Ulothrix asqualis, var. catseniformis, with which submersed Phanerogams, 

 etc. were thickly covered. The water of some of the little creeks was 

 tinofed 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 (tigs. 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 ca^spitosa, 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 



