41 
About four years ago a new pond-weed was added to 
the British flora, by Mr. Andrew Brotherston, of Kelso, who 
found it growing in Cauldshiels Loch, near Melrose, Rox- 
burghshire. Mertens and Koch had named the plant 
Potamogeton Zizii after its first discoverer, Dr. Ziz; its 
affinities are with P. lucens , P. heterophyllus, and their 
allies. Though a rare plant it has a somewhat wide distri- 
bution in Europe, extending from the Scandinavian pro- 
vinces in the north to Bohemia and Bavaria in the south. 
A description of the Cauldshiels plant, together with its 
synonj^my and relationships, have been carefully worked 
out in a paper by Dr. Trimen in the ‘Journal of Botany,’ 
No. 202, October, 1879, illustrated by a plate. 
The distribution in Britain, so far as it has been recorded, 
is somewhat restricted, as the published localities are in the 
counties of Roxburgh and Forfar, in Scotland, and of 
Anglesey, in Wales. So far, there have been no recorded 
occurrences of the plant in England or Ireland, but as it is 
liable to be passed over for Potamogeton lucens, it will 
doubtless be found to be pretty widely distributed in the 
British Isles ; indeed Mr. Arthur Bennett has already had it 
sent him from several additional counties. 
I have now to report its occurrence in two English 
counties, namely, Lancashire and Westmoreland, and speci- 
mens from both localities are being distributed, with the 
plants of the current year, to the members of the Botanical 
Exchange Club. 
I first collected the plant on the 17th September, 1870, 
close to the western shore of Derwentwater, opposite Rose- 
trees, three quarters of a mile to the south of the little village 
of Portinscale. On that occasion there were neither flowers 
nor fruit, and I was unable to refer it to any of the 
recognized British forms. It remained in my herbarium for 
some years, when Mr. Arthur Bennett, F.L.S. (of Croydon), 
who has paid great attention to this group of plants, was 
