424 THE BOTANICAL EXCHANGE CLUB OF THE BRITISH ISLES. 
Luziila maxima, DC., var. gracilis, Rostrup. Fitful Head, Dun- 
rossness, Shetland, nth August, 1890. — W. H. Beeby. 
L. albida , DC. Enclosed wood near Witley Station, Surrey, 
10th June, 1893. — A. FI. Wolley Dod. 
Sparganium ramosum, Curtis, var. microcarpum, Neuman. Crian- 
larich, Mid Perth, 9th August, 1893. Name agreed to by Mr. 
Beeby. Type not seen. — E. S. Marshall. 
Potamogeton gramineus, L., var. graminifolius, Fr. Rv. Boyne near 
Navan, Co. Meath, 30th August, 1893. This is the plant referred by 
Doctor Syme to P. Lonchites, Tuck., in ‘ English Botany,’ and appear- 
ing under that name in the ‘ London Catalogue,’ 8th Ed. Mr. Alfred 
Fryer, however, says he can find no single character by which he can 
separate either the Boyne plant or my Kerry R. Laune form from the 
Huntingdonshire Fen plant which he figures and describes in the 
‘ Journal of Bot.’, p. 33, 1892. — R. W. Scully. “ I suppose correct 
as to the var. graminifolius , Fr., but I have not yet seen my way to 
use the Linnean name in the face of the evidence in his herbarium. 
I prefer to call it hetcrophyllus, though not the exact state so named 
by Schreber.” — A. Bennett. 
P. poly gonifolius x heterophyllus ? Walls, Shetland, 19th August, 
1890. A few examples of the plant fur which I suggested the above 
name in the ‘Scottish Naturalist,’ 1891, p. 29. Whatever the plant 
may really be, I am confident that it is not merely P. poly gonifolius, 
as the deep water and other states of this species have been objects of 
special study on my part. — W. H. Beeby. “ I am doubtful of this 
(as was Fryer), though I have thought it might after all only be a 
polygonifolius form.” — A. Bennett. 
P. helerophyllus, Schreb., form without coriaceous floating leaves. 
Dinan Lake, Anglesey, August, 1893. — J. E. Griffith. “The 
plant of Schreber ! The same plant has floating leaves some years 
and some years none.” — A. Bennett. 
P. lucens, L., var. cornutus, Ivost. Dinan Lake, Anglesey, August, 
1893. — J. E. Griffith. “It is usually considered that var. cornutus 
equals acuminatus, but authentic specimens rather point to a plant 
like these specimens and not the narrow-leaved true acuminatus ; but 
at the most they are only vars. of lucens.” — A. Bennett. 
P. lucens, L., var. acuminatus (Schum). Mouth of R. Inny, L. 
Derevaragh, Westmeath, 9th August, 1892. — H. C. Levinge. “I 
should not have so named it, as by this I understand a plant with its 
lower leaves reduced almost to a midrib.” — A. Bennett. 
P. decipiens, Nolte. ( P. lucens x perfoliatus). R. Avon, near 
Christchurch, S. Hants, 30th June, 1893. R. Frome, above Wareham, 
Dorset, 24th August, 1893. Unrecorded I believe at the date of 
gathering for either county. Mr. Arthur Bennett saw the Hants 
specimen, which I could find only in foliage, and agreed with me as to 
the name. There can be no doubt that in most of our streams this 
hybrid is formed from P. lucens and P. perfoliatus , the two frequent 
companions in our smaller rivers. Mr. Bennett tells me that some 
European botanists regard P. decipiens as P. lucens x prcelongus ; but 
there ought to be n 1 great difficulty in distinguishing these two hybrids 
