166 THE BOTANICAL EXCHANGE CLUB OP THE BRITISH ISLES. 



Damasonium Alisma Mill. Hook, N. Hants, August 1910. — 

 G. C. Druce. . 



Scheuchzeria palustris L. [Ref. No. 3941]. Bog near Rannoch 

 Station, Mid Perth, v.-c. 88, July 17, 1914 ; fruiting freely. I after- 

 wards found it in another swamp not far olf, in leaf only. — E. S. 

 Marshall. 



Potamogeton Zizii Koch. Crooked drain, near Ely, Cambridge, 

 June 2, 1884. — H. and J. Groves. "Is P. praelongus Wulfen." — A. 

 Bennett. 



Potamogeton decipiens Nolte. Canal, Market Harboro, Leicester- 

 shire, v.-c. 55, July 19, 1914. — G. Chester. '-Yes, very fair example 

 of Nolte's plant." — A. Bp:nnett. 



X Potamogeton Lintoni Fryer. Canal, Renishaw, Derby, October 

 1911. A supposed hybrid of crispus and Friesii. It grew in consider- 

 able quantity and with some amount of variability in the Renishaw 

 Canal, to which place I went in order to show Dr Gliick x Apium 

 Moorei in situ. — G. C. Druce. " Yes. P. crispus x Friesii Fryer. 

 This was gathered near Sheen in Surrey in 1912, C. E. Salmon sp." 

 — A. Bennett. 



Potamogeton acutifolius Link. Water course near Wareham, 

 Dorset, June 30, 1914. — J. W. White. "Yes; the smaller form of 

 the species." — A. Bennett. "Yes, from a well-known locality, in 

 which I have gathered it." — E. S. Marshall. Also from deep pool, 

 Staines, Middlesex, July 19, 1879, and July 29, 1882.— H. Groves. 



Potamogeton trichoides Cham, and Schlecht. Ditch near Horsey, 

 E. Norfolk, July 10, 1912. — J. Groves. "I suppose must be so 

 named. It differs from the typical specimens in the Berlin 

 Herbarium by the leaves being mostly three-veined and the fruit not 

 so broad, and the projecting pit being in the circumference of the 

 fruit, not outside it. It differs from the usual British plant by not 

 being tuberculate on the dorsal margin, this being the var. Trimmeri 

 of Dr Caspary." — A. Bennett. " Evidently later-flowering than 

 most of our species; no fruit present the second week in July." — 

 E. S. Marshall. 



Potamogeton mariyius L. Coldisham Loch, Berwick, August 1906. 

 In great quantity, preferring the shelter of Castalia. I use the older 

 and, I believe, the correct Linnean name in preference to that of 

 Nolte. — G. C. Druce. "Yes, characteristic examples of Nolte's 

 P. filiformisy — A. Bennett. 



