112 
DATE. COLLECTOR. 
1290. Potamogeton crispus. 
Linn. 
Ponds and ditches from Isla and Elgin 
to Kent and Devon. 
Distrih. Europe, N. Asia, India, X. 
America, Australia. 
Sp. Malton Ings, Yorks. ... ... ... 1803 ... W. Middleton 
River Foss, at York ... ... ... 1883 ... H. J. Wilkinson ... 
Tarlton Bridge, Lancs. ... 1820—1830 S. Hailstone 
1291. Potamogeton densus, 
Linn. 
Ponds and streams from Forth and 
Clyde to Devon and Kent, Scot¬ 
land and Ireland. 
Distrih. Europe, X. Africa. 
Sp. Ripon, Yorks. ... ... ... 1820 ... Rev. J. Dalton ... 
River Foss, at York ... ... ... 1883 ... H. J. Wilkinson ... 
Mr. Percival’s ponds, at Acomb, near 
York ... .. ... ... 1826 ... S. Hailstone 
1292. Potamogeton zosteri- 
folius, Schum. 
Lakes and ditches from Forfar and 
Perth southwards. 
Distrih. Europe, X. America. 
Sp. Lock of Balgaries, Forfar ... ... 1812 ... Miss Carnegy 
Bottisham Fen, Cambs. ... ... 1S29 ... Rev. J. Dalton ... 
1293. Potamogeton acutifolius, 
Linn. 
Lakes and ditches, Lincoln to Surrey 
and Dorset. 
Distrih. Europe. 
Sp. Susses . 1820 ... W. J. Hooker ... 
1294. Potamogeton obtusi- 
folius, M. & E. 
Ponds and ditches from Lanark and 
Kincardine to Devon and Kent. 
Distrih. Europe, X. America. 
Sp. Lock of Clunie, Perthshire. 1809 ... W. Middleton ... 
Hell Kettles, Darlington ... ... 1816 ... W. Backhouse ... 
HERBARIUM. 
W. Middleton 
H. J. Wilkinson 
S. Hailstone 
Rev. J. Dalton 
H. J. Wilkinson 
S. Hailstone 
S. Hailstone 
Rev. J. Dalton 
Rev. J. Dalton 
W. Middleton 
Rev. J. Dalton 
