crowded and dirty in muddy water. Very fine examples of 
P. lucens L. var. longifolius DC. FI. Fr. vi. 1815, 311 (P. 
macrophyllus Wolfg.), not the P. longifolius of Bab. (Man. 
440) which is P. Babingtonii Ar. Benn. (P. lucens X praelongus) . 
— W. H. Pearsall. 
Potamogeton perfoliatus L. Pond at Loxwood, by the old 
Wey and Arun Canal, West Sussex, Aug. 2, 1931. In deep, 
cloudy water near edge of pond. — E. C. Wallace. Yes, the 
var. ovatifolius Wallr. Schorl, crit. 1822, 66, (var. ovatus Rclib.), 
the common form of calcareous habitats. — W. H. Pearsall. 
Potamogeton crispus L. form with nearly entire leaves. 
In a rhine on Sharpham Peatmoor, Somerset, June 26, 1931. 
— H. S. Thompson. This is a rather broad-leaved form of 
this species — var. obtusifolius f. latifolius Fieber (Polarn. 
Bbhm. 32, 1838) which is the P. crispus a. genuinus Rchb. 
leones 18, 1845, and P. crispus f. typicus of Tiselius. — W. H. 
Pearsall. 
Potamogeton Friesii Rupr. Basingstoke Canal, Odiham, 
N. Hants., v.c. 12, July 18, 1931. — E. C. Wallace. Leaves 
narrower than in the following and mostly 3-nerved. In both 
Mr. Wallace’s gatherings of this species the fruits are well- 
developed and most interesting as they show the distinctive 
backward bend of the style — toward the dorsal margin — and 
the persistent stigma which together form the rather con- 
spicuous subcapitate ‘ beak.’ — W. H. Pearsall. 
Potamogeton Friesii Rupr. Marsh ditches, Iford, Ouse 
Valley, E. Sussex, v.c. 14, July 5, 1931. — E. C. Wallace. 
Good fruiting examples of this species. Leaves 5-nerved. — - 
W. H. Pearsall. 
Potamogeton pusillus L. Poaka Beck Reservoir (inlet), 
N. Lancs., v.c. 69 b, July 13, 1913, Sept. 10, 1913, Aug. 21, 
1919 (f. acutissimus Hagstr. (teste J. 0. Hagstrom) and Sept. 
13, 1919, Pond at Green Haume, Dalton, N. Lancs., Oct. 17, 
1913. — W. H. Pearsall. 
Potamogeton pusillus L., sub-sp. lacustris Pearsall. Ullswater 
Lake, Westmoreland, v.c. 69, Aug. 13, 1919. Pull Wyke Bay, 
Windermere, N. Lancs., v.c. 69b, Aug. 24, 1919. Crummock 
Water, Cumberland, v.c. 70, Sept. 8, 1919. Esthwaite Water, 
N. Lancs., Sept. 20, 1919 and Sept. 3, 1921. Coniston Lake, 
