1904 - 5 .] 
Flora of Scottish Lakes. 
985 
Zygogonium ericetorum, De Bary. I. Purple variety is very 
abundant on other vegetation in Lochan Dubh at Brin. 
Dickieia and similar gelatinous Diatomaceae. I. Abundant 
in some of the mountain lochs. Other diatoms are of 
course abundant everywhere. 
The following plants, usually associated with water-scenes in 
the south, have entirely escaped my observation in these 
areas : — Symphytum officinale, Sagittaria sagittifolia, all 
the Lemnacese, Elodea canadensis, Butomus umbellatus, 
Potamogeton densus, Typha angustifolia, Hydrocharis 
Morsus-Ranae, Sium angustifolium, Apium nodiflorum,. 
Rumex Hydrolapathum, many of the Batrachian Ranunculi,, 
Salix viminalis, S. fragilis, Ricciocarpus natans, Ricciella 
fluitans, etc. 
Many moorland plants not to be seen, or scarce in the south, 
grow here (Area I.) in great profusion. The following may 
be mentioned as being conspicuous by their abundance 
Antennaria dioica, Arctostaphylos Uva-Ursi, A. alpina, 
Betula nana, Cnicus heterophyllus, Cornus suecica, 
Cystopteris fragilis, Drosera intermedia, extremely abundant, 
Empetrum nigrum, Galium boreale, Trientalis europaea, etc. 
II. The Lakes. 
Loch Ness is the largest fresh-water loch in Scotland, it is 221- 
miles long and J of a mile to If miles broad. It is also one of 
the deepest of the Scottish lakes, and drains an area of nearly 
700 square miles. Its surface is 52 feet above sea level. It 
is situated in a huge depression carved by glaciers, and mountains 
rise almost precipitously from its waters on either side, throughout 
its whole length (fig. 4). At the north-east and south-west ends, 
however, the land is low-lying and comparatively flat, being in fact 
the strath, or bottom of the valley known as the Great Caledonian 
Glen, that bisects the Highlands from Loch Linnhe to the Moray 
Firth (fig. 26). The lower slopes of the adjacent mountains are 
abundantly clothed with forest to the water’s edge. Here and 
there bold, bare crags of grey or red rock contrast beautifully or 
harmonise softly with the various shades of green afforded by 
