1909-10.] Flora of Scottish Lakes. 143 



The plants more or less common to this and the last-mentioned loch are 

 as follows :-^Littorella lacustris, Lobelia Dortmanna, Elatine hexandra, 

 Nitella ojoaca, Chara fragilis, var. delicatula, Juncus fluitans, Myriophyllum 

 alterniflorum, Apium inundatum, Fontinalis antipyretica, Callitriclie stag- 

 nalis, aquatic and terrestrial forms ; C. hamulata, Ranunculus Drouetii, 

 Potamogeton natans, P. polygonifolius, P. obtusifolius, P. rufescens, P. Zizii, 

 P. crispus, P. lucens, Castalia speciosa, Xymphaea lutea, Equisetum limosum, 

 Phragmites communis, Sparganium natans, S. simplex, S. ramosum, Carex 

 rostrata, C. filiformis, C. Goodenovii, C. flava, Polygonum amphibium, P. 

 aviculare. Iris Pseud-acorus, Alisma Plantago, A. ranunculoides, Juncus 

 acutiflorus, J. lamprocarpus, J. etfusus, J. bufonius, J. conglomeratus, 

 Comarum palustre, Ranunculus Flammula, Mentha aquatica, M. sativa, ]\I. 

 arvensis, Lythruin Salicaria, Myosotis palustris, Triglochin palustre, Epilo- 

 bium palustre, Senecio aquaticus, Caltha palustris, Viola palustris, Veronica 

 Beccabunga, Pedicularis palustris, P. sylvatica, Galium palustre, Carum 

 verticillatum, Eriophofum polystachion, Hydrocotyle vulgaris, Stellaria 

 uliginosa, Gnaphalium uliginosum. Sphagnum sp., and a few of the common 

 marsh mosses. 



White Loch is about 1 mile long by ^ mile broad, with a maximum 

 depth of 38 feet, and is one of the largest of a group situated about 

 3 miles east of Stranraer. This and the adjoining Black Loch are 

 within the private grounds of Castle-Kennedy, the seat of the Earl of Stair, 

 and are ornamental waters to Lochinch Castle. Although left as far as 

 possible in a natural condition, these lakes are surrounded by lawns or 

 meadows, which are furnished with groups of decorative trees ; there are 

 also wooded islands (figs. 71 and 72). There is no extent of shore anj'^ where 

 about White Loch, neither is there any considerable development of marsh 

 vegetation, but here and there narrow zones of marsh plants, 1 to 10 feet 

 wide, intervene between the water and the grassy banks. The water, which 

 has the same elevation above sea level as that of Black Loch, viz. 54 feet, is 

 not peaty, but is so turbid and greenish-coloured that the bottom cannot be 

 seen at a greater depth than 18 inches when looking over the side of a boat 

 (i.e. in August). Plankton organisms are the cause of this turbidity, more 

 especially the diatom Melosira granulata. There is neither affluent nor 

 effluent to this loch save a shallow boat-canal connecting it with the 

 adjoining Black Loch, the water of which is dark and peaty (presumably 

 these facts guided the nomenclator of the lochs). The water is therefore 

 more or less stagnant, a condition favouring the increase of certain plankton 

 organisms. A feature of both this and Black Loch is the narrow border 

 of Heleocharis palustris that prevails nearly everywhere, growing luxuri- 



