REPORT FOR 1900. 
647 
interesting ‘Monograph of British Pondweeds,’ where it is beautifully 
figured by Mr. Morgan, he describes it as a hybrid under the above 
name. My first impression of this very handsome plant was that it 
was a hybrid of P. natans and P. alpinus. Curiously enough, 
although the plant flowers profusely in the Loddon, hitherto I have 
been unable to get it in fruit, as I think the swans destroy it, but 
Mr. Fryer has been more fortunate. The rooting specimens which I 
sent him have fruited copiously, and he tells me he has now no doubt 
that it is a good species, the fruit being quite distinct from that of any 
pond weed known to him. To any lover of the genus a visit to the 
locality will be a charm, as the beautiful appearance of the submerged 
leaves as they move to and fro in the clear water of the Loddon 
cannot be adequately described. Their beauty and translucency are 
lost in the specimens I enclose. Although two gatherings are sent I 
may say that both floating and submerged leaves can be seen at the 
same time, but the floating leaves were obtained from deeper water in 
August, and the submerged ones from the shallows lower down the 
stream in September, where one can easily reach them by wading. I 
may say that the statement made by Mr. Britten that this “is ,Mie 
P. alpinus of my Flora” is incorrect and misleading. P. alpine 
occurs in all the localities I have given on my authority in the ‘Berk- 
shire Flora,’ and hitherto I have observed no intermediate between it 
and the enclosed, although they grow near together.— G. Claridge 
Druce. 
Potamogeton lucens , var. ? Pond by Lough Neagh, Glenary, Co. 
Antrim. No fruit. Smaller than P. lucens , which grows in the lake 
near. — C. H. Waddell “This seems on the evidence of the specimens 
to be a small state of P. lucens. I have often found the same small- 
leaved form growing with ordinary lucens, and have noticed it changing 
into more robust and typical states such as acuminatus or cornutus. 
Indeed I have gathered specimens from the same root-stock which 
fairly represented ovalifolius, M. et K., the ordinary typical lucens, and 
cornutus, Presl. It is difficult to name imperfect specimens like the 
present with certainty. In this group of Potamogetons , named as one 
species [P. Proteus ) by Chamisso, the whole plant is necessary in 
many cases to enable even the most skilful botanist to decide between 
lucens and Zizii, on the one hand, or between Zizii and gramineus 
(heterophyllus) on the other. P. lucetis has the leaves all shortly 
stalked, P. Zizii has some of the lower leaves sessile, and the upper 
leaves are often long stalked ; always, I think, longer stalked than 
those of P. lucens. If Mr. Waddell will examine this plant in the 
living state next summer he will probably find no difficulty in naming 
it correctly. If sessile leaves occur the plant is a form of P. Zizii. 
If no land forms are met with around the edges, or dried up parts of 
the pond, and if the stem leaves are all stalked, then the plant may be 
safely named P. lucens. May I suggest to members of the Club that 
it is necessary in the case of critical forms of Potamogetons to collect 
as complete specimens as possible, especially when neither flowers nor 
