313 
/ 
Alisma Plantago L., var lanceolatum With. Near Canal, 
Woking, Surrey, Aug. 1924. — W. Biddiscombe. ihe specimen 
sent has nearly all its leaves rounded at the base and seems to be 
an elongate form of the specific type. My specimens of var. 
lanceolatum show leaves gradually contracted below and decurrent 
on the petioles. — H. W. Pugsley. 
Damasonium Alisma Mill. In a splash pool on Mitcham 
Common, Surrey, v.c. 17, July 1924. — D. G. Catcheside and 
J. L. O’Loughlin. 
Potamogeton polygonifolius Pourr., var. pseudojluitans Syme. 
Stream near Thursley, Surrey, Nov. 1924. — I. A. Williams. No 
doubt this is a fluitant form of polygonifolius, but it is not the 
plant of Syme, the type specimen of which was from R. Leven, 
Loch Lomond, and is in the Edinburgh Herbarium. It is so 
much like some forms of P. Jiuitans Roth, that on the label is 
written ' l P. jiuitans 1 ” The heads of flowers are much more like 
jiuitans than polygonifolius, but there is no doubt it is polygonifolius. 
See Boswell Syme in B.E.C. Report for 1872-4, p. 40, and also 
Report for 1876. — A. Bennett. 
P. Drucei Fryer. In the River Avon at Bath, N. Somerset, 
Aug. 27, 1923. — H. S. Thompson. Mr. Bennett says in Journ. 
Bot., Ma}', 1925 : “The above name must give way to one long 
referred to other species, but about which no definite decision 
could be given. It is P. pctiolatus Wolfgang (ex Besser) in 
Roem. & Schult. Syst. Veg. Mant. 3, 365 (1827).” Dr. Druce, 
when he first found this, suggested P. natans x alpinus. In 1910 
Mr. Fryer, of Chatteris, wrote to me : “ P. Drucei seems to be 
polygonifolius x lucens.” To this I strongly objected. But in his 
Potamogetons of the British Isles , p. 31, t. 21 (1898), after discuss- 
ing various names, he observes, “Probably Mr. Druce is correct 
in supposing it to be alpinus x natans.” Dr. Hagstrom, in Crit. 
Res. Pot. (1916), p. 146, names it P. alpinus Balbs. x P. natans L. 
At the date of 1898 no fruit had been seen, but by cultivating it 
Mr. Fryer succeeded in fruiting it, and up to the present I have 
been unable to match it with any known species. In the Sec. 
Rep. B.E.C. for 1919, p 713 (1920) Dr. Druce gives a very inte- 
resting account of Mr. Fryer’s correspondence about the plant. 
But it is a mistake to suppose it is the only P. alpinus x natans 
(if so), as Neuman, in his Sveriges Flora (1901), p. 708, gives it 
from “Vermland, Klaraflven, neaf Karlstad.” And Kiipffer, in 
Korresp. Nat. Ver. Riga (1906), p. 169, gives it from “Ogerfliisse 
bei Ogea (1895),” in the Baltic provinces of Russia. Asch. and 
Graebner, in Das PUanzenreich, iv. 2 (1907), p. 65, give it as a 
