Flora of Scottish Lakes. 
169 
1909-10.] 
There is no boat on any of the three last-mentioned lochs, so that it is 
impossible to say anything about their submerged plants except such as 
could be seen from the shore, or washed there, or gathered by swimming 
after them. Besides the plants already enumerated the following species 
were more or less common to these three lochs : — Littorella lacustris, Lobelia 
Dortmanna, Myriophyllum alterniflorum, Fontinalis antipyretica, Chara 
fragilis, var. delicatula, Castalia speciosa, Potamogeton polygonifolius, 
Equisetum limosum, Carex Goodenovii, Ranunculus Flammula, Eriophorum 
vaginatum, Juncus acutiflorus, J. effusus, Cardamine pratensis, Montia 
fontana, var. minor, Hydrocotyle vulgaris, Blindia acuta, Sphagnum 
intermedium, S. cymbifolium, Philonotis fontana, Aulacomnium palustre, 
Polytrichum commune, P. gracile, Hypnum commutatum, H. revolvens, 
H. scorpioides, H. cuspidatum, H. fluitans, Webera nutans, Bryum bimum, 
B. pallens, B. argenteum, Ceratodon purpurens, Rhacomitruim aciculare, 
Scapania undulata, Pellia epiphylla, and Diplophyllum albicans. 
Harperleas Reservoir is situated on the Lomond Hills, at an elevation 
of 848 feet above sea level. It is about J mile long, and is of an irregular 
shape, with clear but somewhat peaty water. It has been formed by the 
construction of a long dam at the east end, and there the maximum depth of 
41 feet occurs. The south shore is either stony or muddy, and at some 
places the bank enters the water without the intervention of a shore. At 
the north and west the shore is flat, and muddy or peaty, and is covered 
with a luxuriant vegetation, whilst there are very few plants at the south 
shore, and none along the dam. A zone of Equisetum limosum, behind 
which are Carex rostrata and Juncus effusus (fig. 110), extends along the 
greater part of the north side. The Equisetum is intermingled with 
Littorella lacustris, which also runs up the shore and forms a dense sward 
in some places. Occasionally considerable areas of exposed mud were 
covered with Juncus fluitans, which was reverting to the terrestrial type — 
J. supinus — which it somewhat resembled. Other normally submersed 
plants were assuming a terrestrial habit and forming a meadow-like sward 
upon the exposed shore, particularly Ranunculus aquatilis, Heleocharis 
acicularis, Polygonum amphibium, Potamogeton polygonifolius, and P. 
heterophyllus. The normal aquatic form of the last mentioned was very 
abundant at this loch, and those plants left upon the exposed mud were 
developing new shoots with aerial leaves similar to the coriaceous floating 
ones but smaller, the shoots with thin submersed leaves having completely 
withered away. At the north-west end a portion of the shore presented a 
remarkable appearance through being covered with dead tussocks of 
Molinia cserulea, which had been drowned during some period when the 
