376 EEPOET OF THE BOTANICAL EXCHANGE CirS. 



fluitans of E. B., ed. iii.) is that th(! lower submerged leaves are nar- 

 rowly linear, being from six to eighteen inches long by iV to ^ 

 broad, not rigid, like the leafless petioles of P. natans, which they 

 resemble in form. ]S^ either have the floating leaves the coria- 

 ceous substance carried down into the petiole, as in P. natans. To 

 this form I have given the name var. linearis. Mr. A. Brotherston has 

 sent me from Floors, near Kelso, a specimen of a Potamogeton without 

 flowers, which I think will prove to be the same as the Killarney 

 plant. I hope he may be able to obtain a supply of it in flower and 

 fruit for the Botanical Exchange Club. In looking over the Edin- 

 burgh Herbarium I saw a fine specimen of the P.sparganiifolius similar 

 to the Maam plant, with a label stating that it was gathered in Loch 

 Keagh by Dr. D. Moore, of Glassnevin. In the same collection there 

 were very fine specimens of P. polygonifolius fseudo-Jluitans^ 

 with the submerged leaves six inches long by f broad in the 

 middle, labelled from the Leven, Loch Lomond." — J. T. Boswell, 

 June, 1875. 



P. nitens, Web. " A single specimen gathered by me in the Bay of 

 Islands, Upper Loch of Stennis, Orkney, August, 1873." — J. T. Bos- 

 well. 



Potamogeton lucens,!!., var. '' Kinghorn Loch, 1873 and 1874. In 

 1873 I found a few small patches of a Potamogeton in the north-west 

 corner of Kinghorn Loch, which when in the water resembled in 

 colour and appearance a broad-leaved form of P. polygonifolius. 

 On rowing to the place and gathering it, it turned out to be what I 

 had never before seen, P. lucens, producing subcoriaceous floating leaves. 

 They were of a bright yellowish-green colour and firm consistency, 

 much of which they lose when drying. Their petioles were ex- 

 tremely short, in this forming a great contrast to the floating leaves of 

 9iatans, polygonifolius, and heterophyllus. Some of the specimens had 

 the leaves broadly ovate and shortly stalked, but still of the usual 

 membraneous texture and translucent appearance. Very few of the 

 plants flowered, and not a single one was found in fruit in spite of many 

 diligent searches. The water in 1873 was from one to three feet deep 

 where the plant grew. In 1874 Kinghorn Loch stood at a much 

 lower level, and the P. liicetis was left dry, as well as the P. natans, 

 with which it grew intermixed. The stems had become extremely short 

 and decumbent, few of them above six inches long ; the submerged 

 leaves had entirely withered, from being exposed to the air, 

 and only those which were furnished with an epidermis re- 

 mained, forming small rosette-like tufts of nearly sessile leaves. 

 No flower or liuit was produced, so far as I could find." — J. T. 

 Boswell. 



Zannichellia polycarpa. ISTolte. '^Kirbister Loch, Orphir, O.-kney, 

 July, 1874.'' — WiLLiAii Foktescue. "In 1849 I gathered in Kirbister 

 Loch a Zannichellia, which remained unexamined until I came to write 

 the 9th vol. of ' Eug. Bot.,' ed. iii., when I found that the style was 

 much shorter than the ordinary forms of Zannichellia. What I could 

 say of i^^then will be found in ' Eng. Bot.,' vol. ix., p. 57. In this 

 notice there is a misprint oi Swanbister j^oah, instead of Kirbister. 

 After this paragraph was written, Mr. Baker showed me a specimen of 

 the Orkney Zannichellia gathered by me, which ia some indirect way 



