162 Proceedings of the Royal Society of Edinburgh. [Sess. 



of vegetable detritus would pollute the water. The margin of the bay, 

 otherwise than upon a portion of the east side, has a very sinuous outline, 

 partly because some old gravel quarries have been connected with it. A 

 considerable portion of this bay is quite shallow, consequently a large area 

 of mud is exposed after a period of drought. Upon this exposed mud I 

 found a few specimens of Riccia crystallina, and Mr James M' Andrew 

 discovered a small spot where it was quite abundant. According to my 

 experience, the Ricciacese are very rare about Scottish lochs, but Mr 

 William Evans and Mr James M'Andrew discovered five species in the reser- 

 voirs around Edinburgh, when the water level was abnormally low, during 

 the dry summer of 1905.* My friend Miss Helen S. Ogilvie has found 

 Riccia Lescuriana in great abundance just below the normal water level of 

 Loch Long on the Sidlaw Hills ; and at pools around the Morton Lochs on 

 Tents Muir, some species of this genus abound on the sandy mud when the 

 water has fallen (p. 152). Possibly such Hepaticae have been previously 

 overlooked, and a more diligent search might prove them to be of more 

 common occurrence about the lochs than is at present acknowledged. 

 Terrestrial forms of Littorella lacustris are very abundant upon the east 

 shore of this bay. Upon a portion of the shore that is evidently only 

 submerged in winter, there was a large prostrate form of this species, with 

 copious stolons as well as flowers. The submerged subulate leaves M'^ere 

 dead, and the flattened aerial leaves were slightly ciliated at the margins. 

 In this bay there was also a curious aquatic form of Bryum pallens growing 

 amongst Littorella, etc. (p. 92). One of the deep pools of the bay was 

 almost filled with Myriophyllum alterniflorum, whilst in another Potamoge- 

 ton obtusifolius, var. fluitans, was very abundant, and at the same place 

 Myriophyllum alterniflorum and M. spicatum were growing together, which 

 is rather unusual. Fig. 99 affords a view of this loch from the north, 

 looking towards Dunearn Hill. 



Besides those enumerated above, the following plants occur here : — Nitella 

 opaca, Chara fragilis, Callitriche autumnalis, Apium inundatum, Potamogeton 

 obtusifolius, P. filiformis, P. pusillus, P. perfoliatus, P. prselongus, P. lucens, 

 P. Zizii, Ranunculus peltatus. Polygonum amphibium, Sparganium simplex, 

 S. ramosum and its var. microcarpum, Carex rostrata, C. Goodenovii, C. 

 aquatilis, C. flacca, C. disticha, Alisma Plantago, Caltha palustris, Radicula 

 officinalis, Myosotis palustris, Comarum palustre, Mentha sativa, M. aquatica, 

 M. arvensis, Juncus bufonius, J. glaucus, J. effusus, J. conglomeratus, J. 

 acutiflorus, Epilobium tetragonum, E. palustre, Galium palustre, Stellaria 

 uliginosa, Phalaris arundinacea. Ranunculus Flammula, R. sceleratus. 

 * Trans, and Proc. Bot. Soc. Edin , 1907, vol. xxiii., part iii., p. 285. 



