1909-10.] Flora of Scottish Lakes. 119 



deep. The floor of this loch, from a depth of about 8 feet to the deepest 

 part, is covered with the dead remains of vegetation, which prevents the 

 growth of plants upon that portion of the bottom, as at some other lochs 

 previously mentioned. From this zone of dead material to tlie maro-in, 

 the bottom in many places is carpeted \vith Lobelia Dortmanna and 

 Littorella lacustris. The following plants also occur here abundantly : — 

 Nymphaea lutea, Castalia speciosa, Potamogeton lucens, P. natans, P. poly- 

 gonifolius, a large Nitella at a depth of from 6 to 8 feet, respecting whicli 

 the Messrs Groves, to whom specimens were submitted, write : " A large 

 barren form of either N. opaca or X. flexilis." Menyanthes trifoliata, 

 Seirpus lacustris, Phragmites communis, Heleochai'is palustris, Carex 

 rostrata, C. filiformis, Juncus efFusus, J. acutiflorus, J. lamprocarpus, 

 Ranunculus Flammula, Mentha aquatica, M. sativa and its var. rubra, 

 Spiraea Ulmaria, Comarum palustre, Carum verticillatum, Galium palustre 

 (fig. 30), and Eriophorum polystachion. The following are less abundant : — 

 Heleocharis acicularis, Myriophjdlum alterniflorum, Potamogeton praslongus, 

 Juncus fiuitans, J. conglomeratus. Iris Pseud-acorus, Deschampsia ceespitosa, 

 Carex Goodenovii, and Lythrum Salicaria. 



At some parts of this loch the following successive zones of plant 

 associations were observed, starting from the shore:— (1) Juncus efFusus, J. 

 lamprocarpus, J. acutiflorus, and Ranunculus Flammula, all more or less 

 mixed. (2) Carex rostrata or C. liliformis. (3) Heleocharis palustris. (4) 

 Phragmites communis. (5) Equisetum limosum. (6) Seirpus lacustris. (7) 

 Potamogeton natans, P. polj^gonifolins, and P. lucens, mixed. (8) N^nnphfea 

 lutea, Castalia speciosa, and Potamogeton natans, mixed. (9) Carpeting the 

 bottom below these zones, wherever there was space. Lobelia Dortmanna 

 and Littorella lacustris. 



From a study of the foregoing details it will be observed that tliis locli 

 forms a somewhat transitional stage between a typical peaty highland loch 

 and a typical lowland one : figs. 28 and 29 represent some of its features. 



Blates Mill Loch is a small circular pool within a few hundreds of 

 yards of the east shore of Woodhall Loch. It is surrounded by a zone of 

 Carex rostrata and Equisetum limosum, the former being next the shore. 

 There are also ((uantities of Nymphaea lutea, Castalia speciosa, and some 

 other plants connnon to the district. 



Mossdale Loch is a peaty pool i mile from New Galloway railway 

 station. It contains a few plants common to the neighbourhood, but, like 

 the last mentioned, it appears to be of no further botanical interest. On the 

 moor east of Mossdale Loch there occurs a particularly fine example of the 

 destruction of forest by wind. 



