Flora of Scottish Lakes. 
129 
1909-10.] 
This is the reservoir for the water supply of Castle-Douglas, and presents 
little of botanical interest beyond a few common plants, such as associations 
of Carex rostrata and Equisetum limosum upon the south shore. Hyperi- 
cum humifusum in dry places and Anagallis tenella on wet sand (fig. 49) 
were abundant on the west shore, both being unusual members of a shore 
flora. The latter was especially noticeable because it grew in pure patches, 
instead of straggling amongst other vegetation as is its usual habit, a fact 
due to the paucity of competing species. Although this is the reservoir 
for Castle-Douglas, yet cattle have free access to the water from the 
grazing grounds to the south, and in many places the shore was filthy with 
the excrement of these animals. This is a feature too common with the 
water supply of small towns, which, in the interest of public health, should 
be safeguarded against. 
Loch Erncrogo is about a mile north-east of Crossmichael. It is a 
small loch of the lowland type about J mile long, and being more or 
less surrounded by marsh, there is little shore. Outside the zone of bog, 
rich agricultural land prevails, excepting on the west side, where there is a 
plantation of conifers. The chief features here are the great associations 
of Carex rostrata (fig. 50), beyond which the shallower areas of the loch, 
particularly at the north end, are overgrown with Castalia speciosa, 
Nymphasa lutea, and Equisetum limosum. As the water was more or less 
unapproachable by reason of the bog, and as no boat was available, I am 
not able to indicate all the submerged plants. Those of the marginal zone 
are chiefly as follows : — Littorella lacustris, Nymphaea lutea, Castalia 
speciosa, Potamogeton natans, Scirpus lacustris, Equisetum limosum, 
Heleocharis palustris, Menyanthes trifoliata, Comar um palustre, Sparganium 
ramosum, Iris Pseud-acorus, Carex rostrata, (Enanthe crocata, Spiraea 
Ulmaria, Ranunculus Flammula, Lythrum Salicaria, Phalaris arundinacea, 
Myosotis palustris, Veronica Beccabunga, Mentha sativa, M. aquatica, 
Stachys palustris, Carum verticillatum, Eriophorum polystachion, Caltha 
palustris, Galium palustre, Juncus effusus, J. acutiflorus, J. lamprocarpus, 
Plantago lanceolata, etc. These plants were more or less intermingled, and 
not in definite associations of one kind, excepting in the case of Carex 
rostrata and Equisetum limosum. This, I suppose, is due to the gentle 
inclination of the boggy shore towards the water, and to the general con- 
ditions being equally agreeable to many species without being particularly 
favourable to a few only. 
Loch Dornell is also a small loch, and occupies a somewhat exposed 
situation in an agricultural and moorland district 2 miles west of Cross- 
michael. The water is very clear, the shores are stony, and, besides associa- 
vol. xxx. 9 
