1909-10.] Flora of Scottish Lakes. 129 



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 drj' 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 straa-o-Hno- amono-st 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 tlie sliore 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 |^ mile long, and being more or 

 less surrounded by marsh, there is little shore. Outside the zone of bog, 

 ricli 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, 

 Nymphaea 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, Nymphasa lutea, Castalia 

 speciosa, Potamogeton natans, Scirpus lacustris, Equisetum limosum, 

 Heleocharis palustris, Menyanthes trifoliata, Comarum palustre, Sparganium 

 ramosum. Iris Pseud-acorus, Carex rostrata, (Enanthe crocata, Spiraa 

 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 Cro.ss- 



michael. The water is very clear, the shores are stony, and, besides associa- 

 VOL. XXX. 9 



