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 Ricciaceae 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 Hepaticse 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 were 
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, Caltlia 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. 
