REPORT FOR 1883. 
95 
Sparganium affine , Schum. Pool, Benderloch, Argyle, Aug. 6th, 
1883. — H. & J. Groves. Sandy Lochs, Hoy, Orkney, Aug. 31st, 
1883. — H. Halcro Johnston. 
Potamogeton polygon if 0 Hus, Pour, pseudo-fluitans. Peaty Pool, 
Glen Torsa, Arran, 12th Sept., 1883. — Augustin Ley. “Certainly 
not pseudo-fluitans ; some of the specimens at least come under natans 
and are the var. lanceolatus of Fieber.” — Arthur Bennett. “ My 
specimen is natans.” — W. H. Beeby. 
P. plantagineus, Du Croz. Roydon Marsh, Norfolk, June nth, 
1883. — W. R. Linton. “ I think I am right in supposing this to be 
E. Norfolk (although the plant occurs also at Roydon in W. Norfolk), 
if so, it is a new locality for the county.” — Arthur Bennett. 
P. plantagineus , Du Croz. Ditch, Boswell Fen, Cambridgeshire, 
Aug. 6th, 1883. — Arthur Bennett. 
P. rufescens, Schrad. All dwarf, none flowering — in an alpine 
tarn, alt. 3,100 ft., Killin, Mid-Perth, Aug. 21st, 1883. Small plants, 
only a few inches high, and none attempting to flower, covered the 
peaty bottom of a mountain tarn in places at the unusual elevation of 
about 3,100 ft. Each plant has one or two stolons, by which it was 
being propagated. Nitella opaca, Ag. was in the same elevated tarn. 
Both plants have been seen, and the name certified by Mr. Bennett. 
— E. F. Linton. 
P lucens, L. acuininatus. In the Wye near Foy, Herefordshire, 
Sept. 20th, 1883. Shewing every variation in the length of the mid- 
rib beyond the blade of the leaf, on the same plant. The characteristic 
midrib was most prominent in leaves growing at some depth below 
the surface of the water : here sometimes the leaf would be reduced 
to the midrib only. — Augustin Ley. Is simply lucens with narrow 
leaves, the midrib variously excurrent at the apex and is not what I 
understand as the plant of Schumacher. 
P. decipiens , Nolte. Welches Dam, Old Bedford River, Cam- 
bridgeshire, Aug. 1883.— -Coll. Alfred Fryer; comm. Arthur 
Bennett. 
P. Zizii ', M. & K. Slow stream, Co. Cavan, July 6th, 1881. — S. 
A. Stewart; comm. Arthur Bennett. Not typical; P. borealis, Tis. 
proxime. — A. Bennett. Hedge Court Mill pond, Surrey. To con- 
firm new county record. I am unable to send any of the floating 
leaves, but send some of the aerial leaves formed when the plant is 
left stranded. The difference between these leaves and those of 
P. heterophyllus when growing on mud will be observed. — W H. 
Beeby. “Approaching the lake form, not typical Zizii, M. & K.” 
Arthur Bennett. 
Potamogeton borealis , Tis. Outlet of Cluny Loch, E. Perth, July, 
1883. — G. C. Druce and A. Sturrock. Mr. Sturrock pointed this 
out to me in its original station, an outlet of the Cluny Loch, in 
rather swift running water. The plant is in an immature state, as 
were all my Perthshire Potamogetons , the season being unusually back- 
ward — three weeks, according to Mr. Sturrock — and the water in the 
Loch two feet above average height. I should have called the plant 
nitens. — G. C. Druce. I do not understand Mr. Druce’s name. Dr. 
Tiselius’s “ P \ borealis , Tis. ad interim,” is a form of P. heterophyllus , 
