REPORT OF THE BOTANICAL EXCHANGE CLUB. 375 



Salix laurina. " St. Germain's Loch, ^ew Kilpatrick, Dumbar- 

 tonshire." — Richard McKay. 



Salix phijUcifolia, Y'dv. Weigeliana. '' Possil Marsh, Lanarkshire, 

 1873 and 1874."— Richard McKay. 



Salix laxiflora. " Clyde Ironworks, Lanarkshire, 1873 and 1874." 

 — Richard McKay. 



Ti/pha angustifolia, L. *' A young specimen from the river bank of 

 the Tavy at Lap well, with three foliaceous bracts, one older speci- 

 men with the bracts gone. I suspect that the male spikes of this will 

 be found to be always furnished with foliaceous bracts, but that their 

 very deciduous character has caused the contrary to be stated {vide 

 Eng. Bot., ed. 3, vol. ix., p. 4). Also two specimens from a pond 

 between Landrake and Tideford Cross, East Cornwall, each with three 

 foliaceous bracts, and having the male and female portions of the spike 

 contiguous, or very nearly so. In this latter plant the spikes are 

 remarkably long." — T. R. Archer Briggs. 



Potamogeton pohjgonifoUus, Poir., var. linearis. *' In the 'Long 

 Range,' between the upper and middle lakes of Killarney, Co. Kerry." 

 — R. M. Barrington, June, 1874. " Two years ago Mr. A. G. More 

 sent me a specimen of a Potamogeton gathered by him at Ballina- 

 hinch, Co. Galway, which he had labelled pohjgonifolim, var., but 

 afterwards came to think that it came very near indeed to P. sparganii- 

 folius, though slighter and more slender than the Maam plant. 

 The specimens were without flower or fruit, without which it is im- 

 possible to be certain about Potamogetons, but as far as it went I was 

 inclined to agree with him. In 1873 he sent me some fresh speci- 

 mens from Killarney, which were apparently the same as the Ballina- 

 hinch plant, but had the leaves shorter and narrower ; it also was 

 without flower or fruit. In looking over the Potamogetons of the 

 Edinburgh University Herbarium I found a specimen of the same 

 plant collected by Colonel Madden : this also was without flowers or 

 fruit, and bore considerable resemblance to the P. variifolias of Thore. 

 In June, 1874, Mr. More askedMr Richard M. Barrington, who was at 

 Killarney, to send me fresh specimens of the plant, if possible in flower ; 

 and in answer to this request I received from him a tinful of the 

 plants in afresh state, with a letter, from which I extract the follow- 

 ing : — * June 27, 1875. The water it grows in is from four to ten feet 

 deep, and is in motion. The motion is, however, very slight, as might 

 be expected ; the phyllodes are longer and more thread-like where 

 the water moves quickest ; the plant is very abundant, interfering with 

 the motion of the boat in some places. It does not seem to flower 

 very extensively, as there were many patches quite barren. There 

 are two or three pieces at the bottom of the canister which I obtained 

 near Oak Island. They are not quite the same.' These specimens 

 were quite sufficient to settle that the plant was a form of polggoni- 

 folius. The peduncles and flowers^were quite similar, and the stems 

 unbranched. The floating leaves were mostly one to two inches long 

 on the plants from the Long Reach, but some of those on Oak Island 

 exceeded three inches. They were regularly elliptical or oblong-ellip- 

 tical, and had a red tint, which however became a brilliant green 

 when placed in an aquarium. The point in which they differ from 

 the ordinary deep-water form of P. 'polygonifolius (the var. pseudo- 



