BOTANICAL EXCHANGE CLUB. 
36 
P. nitens, Web. I send examples of this pond-weed (gathered 
in June, July, and August, 1875-6) from different parts of the 
Tweed and Teviot, where it is very common, I may say abundant, 
in the counties of Eoxbiu’gh, Berwick, and Northumberland. It is 
variable in appearance, like others of the family, as will be seen 
from specimens sent. In the description of the leaves in ‘ Student’s 
Flora,’ recurved is surely a misprint for hicurved. — Andbew 
Bbotherston. Very luxuriant specimens. — J. T. Boswell. 
“ Potamogeton htmis, Linn., b. clecipiens." In the Wye, Sellack, 
Herefordshire. August 12, 1876. — Augustin Ley. I should like 
much to see a series of specimens of this plant, particularly some 
in fruit, and with the barren branches fully developed. I am 
inclined to name it P. nitens, though the leaves are less amplexicaul 
than they usually are in that plant, but they are too much so for 
P. lucens. The serrated margins of the leaves and the small spikes 
separate it from P. decipiens. — J. T. Boswell. 
P. lucens, Linn., /3. acuminatiis. Bramber, Sussex. August 
26, 1876. Sent to point the query whether all young shoots of 
ordinary “ hicens ” are not “ acuminatiis,'’' as young plants of 
“ crispus” are “ serratus." — J. L. Warren. Kightly named acumi- 
natus," but acurninatus is not a young state of ordinary lucens, at 
least when growing in lakes or pools, as I can testify, Lorn having 
observed the plant both in Berwickshire and Fifeshire. — J. T. 
Boswell. 
P. pusillus, Linn., b. tenuissimus. Brick ponds near York. 
August, 1876. — G. Webster. 
ZannichelHa palustris, eu-palustris . Syme, E. B. Near Stone- 
bridge, Warwick. July, 1876. — J. Bagnall. Miller’s Dale, Derby- 
shire. August, 1876. — Charles Bailey. In the Cudbeck, below 
Sowerby, Thirsk, N. E. Yorkshire, July, 1876. — T. J. Foggitt. 
Mottisfont, S. Hants, August, 1876. — H. Groves. Barcombe and 
Burgess Hill, Sussex. — J. L. Warren. All the above certified as 
eu-palustris by Dr. Boswell. — T. K. A. B. 
Z. piedicillata. Fries. Long Annet Point, Culross, Perth. 
August 26, 1876. — Tom Drummond. These are the first Scotch 
specimens of Z. piedicillata that I have seen. It is recorded, how- 
ever, from “left bank of the Frith, between Glencaple and 
Caerlaveroch, by A. 0. Balfour, in ‘ Trans. Bot. Soc. Edinburgh,’ 
vol. xn., p, 60. — J. T. Boswell. 
AT. pedicillata. Fries. Brackish ditch near Gravesend, West 
Kent, June, 1876. — H. & J. Groves. Marshes below Woolwich, 
Kent, July, 1876. — Eyre de Crespigny. Pool, Seaton Estuary, E. 
Cornwall, 1876. — T. K. A. Briggs. 
Z. polycarpa, Nolte. Brackish marsh near Belfast, Ireland.— 
S. A. Stewart. (Named by Dr. Boswell.) The plant I send to 
the Club was collected by me as Z. hrachystemon , though the very 
short style and naiTow carpels should have enlightened me ; it is 
abundant in the brackish ditches of the ground reclaimed from the 
sea, adjoining the People’s Park, Belfast. There were few flowers 
at the time, but the folloAving I find on my notes : “Anther fila- 
ments about one-eighth inch long.” Little attention seems to have 
