149 
Herbm.) refers it to Dumortier, “FI. Belg. Prod. 1827. In 
some Floras it is given as of Gay, but his observations were long- 
after Dumortier’s. — A. Bennett. 
Hydnlla verticillata Casp. Esthwaite Water, N. Lanes., we. 
09 b, August 1920. First discovered here in 1914, and now more 
abundant than formerly. Grows with Naias flexilis. Pot. panor- 
mitamis, P. Sturrockii, Callitriche autumnalis , etc., at a depth of six 
to eight feet, invisible from the surface, under a light-intensity 
of -05 to -03 of full daylight. Light does not entirely control its 
distribution however, for it is only found where the mud is 
inorganic, blue-grey in colour and clayey in texture, and contain- 
taining less than 15 per cent, of organic matter. It propagates 
itself here solely by means of winter buds ; no flowers have been 
seen, although carefully sought for for six years. The nearest 
place where it is known to occur is in Pomerania, 700 miles due 
east. It is conceivable that ducks, driven westward by the colder 
winters of that country, alighted on this private and secluded 
water with winter-buds adhering to their feathers or feet. This 
is supported by the fact that the extensive reed-swamps on the 
lake-margin still shelter great numbers of wild fowl of many 
species. The lake drains into Windermere, less than two miles 
distant ; but so far we have not been able to find the plant there. 
This, however, is not surprising, for the conditions under which 
plants live in the two lakes are very dissimilar. Plants on the 
lake-floor in Esthwaite are invisible at four feet, but easily recog- 
nised in Windermere at twelve feet (and objects of light colour 
up to twenty feet), while the quantity of silt in the former is 
much greater than in the latter, and essentially different in 
character. ( See “Journ. Ecol.” Dec. 1917). — W. H. Pearsall. 
A beautiful series and most interesting notes. — H.S.T. 
Carex Kattegatensis Fries. Wick river, Caithness, July 20, 
1897. Leg. Miss Grant and Mr. J. Grant. Comm. A. Bennett. 
Part of a gathering from twenty-two distinct stations on the 
river. Made with a view to comparison with the salina section 
of Herr Almquist’s collection of Scandinavian forms which he 
had kindly lent me, but I found it impossible to collate them or 
assign them to any exact form other than a range of variation of 
C. Kattegatensis. Its distribution in Europe is rather local. In 
Finland in Ostrobothnia borealis in three localities. In Norway 
near Christiansand ; in Sweden in the provinces of Halland and 
Bohulsan ; and in Scotland, Caithness, Wick and Beauly, Inver- 
ness. — A.B. 
t>v EM 
