Li 
40 ENGLISH BOTANY. 
in Fries’ Herbarium Normale at Kew, and in the Bath plant they are 
very conspicuous towards the apex of some of the leaves, and nearly 
absent in others. 
Great Pondweed. 
French, Potamot luisant. German, Spiegelndes Samkraut, Triigerisches Samkraut. 
q 
j 
; 
SPECIES (?) X1.—POTAMOGETON “LONGIFOLIUS.” | 
Gay. Bab. 
Prats MCCCCX. 
Reich. Ic. Fl. Germ. et Helv. Vol. VII. Tab. XL. Fig. 70. 
Bab. in Engl. Bot. Suppl. No. 2847. Man. Brit. Bot. ed. vi. p. 364. 
P. macrophyllus, Wolfy. in Rém. et Schultes Mant. p. 358. 
Stem stout, sparingly branched, the lower branches barren. Leaves 
all similar, the lower ones alternate, the upper opposite, submer, ( 
sessile or subsessile, not amplexicaul, ascending, flat, long, strap- 
shaped, gradually attenuated at the base but with scarcely any petiole, 
acute, mucronate, not hooded at the apex, not serrulate at the margins, 
translucent, with several longitudinal ribs connected by numerous 
ascending(?) transverse veins. Stipules rather small, “ green, lan 
late, with 2 narrow wings on the back” (Bab.). Peduncles terminal ( ?), 
long, very stout (thicker than the stem), slightly thickened tow: Is 
the apex. Fruit (of the Irish plant) unknown. j 
A single specimen, gathered in deep water, Loch Corrib, Galway, 
by Mr. John Ball, in 1835. It has not been found since. ( 
Treland. Perennial. Autumn. ‘ 
Of this plant I have never seen British specimens. Judging from the 
figure in “ English Botany Supplement,” in which the leaves are re- 
presented as partially clasping, and from the very long pedun 
(6 inches long), I was inclined to believe it a form of P. prelon 
But Professor Babington has kindly examined his Irish specimen, an 
thus writes :—“ I do not think that this is P. prelongus. It does not 
seem that even the floral leaves are really amplexicaul, as they app ear 
decidedly narrowed to their base, and those of the branches have 
mostly very short stalks, nor is their tip hooded, as I have alwa 
found it to be in true P. prelongus, but terminates in a point, 
those of P. lucens. It seems also to have the winged stipules of the 
plant, but its leaves are not mutually denticulate. It is Reich. F 
Germ. Exsice. No. 2501.” a 
P. longifolius, Gay, of which there are numerous French specimeé 
in his herbarium, has the leaves more narrowed towards the base thi 
in the “ Engl. Bot. Suppl.” figure, but is probably the same. In t 
continental plant the peduncles are sometimes long, sometimes shor 
