216 TRANSACTIONS AND PROCEEDINGS OF [Sess. lvi. 



north-west of Tyndrum, and from which the Lochy takes its 

 rise. It is situated in Argyleshire, and is 822 feet above 

 sea-level. In this loch we saw some good aquatic plants, 

 such as Lobelia Dortmanna, L. ; Sparganium, natans, L. ; and 

 Isoetes lamstris, L. We gathered in considerable quantity a 

 grass-like plant, growing entirely under water, and at a con- 

 siderable distance from the edge of the loch, which we were 

 unable to identify. Living specimens were obtained, and 

 the plant is now being cultivated in the Eoyal Botanic 

 Garden. The plant has been submitted to various authorities, 

 including Mr Bennett of Croydon, and there appears to be a 

 general consensus of opinion that the plant is Scirpus 

 iluitans, L. I asked Dr John H. Wilson to examine the 

 plant microscopically, and he writes to me saying " further 

 microscopic examination has convinced me that your 

 Tyndrum plant is Scirpus fluitans." There was neither 

 flower nor fruit on any of the specimens gathered. The 

 leaves were long, linear, and grass-like, and the plant presented 

 somewhat the appearance of having become viviparous, 

 producing new' plants instead of flowers. I sincerely hope 

 the plant will produce flowers in the Eoyal Botanic Garden, 

 and thus establish beyond the possibility of a doubt the 

 identity of the species. We could see no vestige of Scirpus 

 fiuitans growing around the edge of the loch, and certainly 

 if it be S. fiuitans it is a very remarkable variety. Hooker 

 gives the length of the leaves of aS*. fiuitans as 1 to 2 inches, 

 and Bentham as -^ to 2 inches. The leaves on our plants 

 were very much longer. Scirpus fiuitans is not a common 

 plant, and our plant was abundant in the loch. Babington, 

 in his Manual, mentions under Scirjnts fiuitans " stem routing 

 from the lower joinings and spreading to a great extent in 

 a zigzag manner." This may to a certain extent explain one 

 of the peculiarities of our plant. I hope that a further 

 search will be made in Lochan VAic for this plant. In many 

 respects this was not only, the find of the day, but was the 

 best plant gathered during this excursion. 



i'l'iday, 31st July. — To-day we resolved to visit the Corrie 

 in Cruach Ardran, a mountain 3428 feet high, and situated 

 south-west of Ben More. We took the train from Tyndrum 

 to Crianlarich, from which the mountain is easily ascended. 

 The day was fine, and we had a pleasant excursion. The 



