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824 ON A NEW HYBRID POTAMOGETON OF THE FLUITANS GROUP.
of Mepal, Chatteris, and Doddingtou, all in District 7 of Cambridge-
shire, Co. 2U.
By the great liberality of Dr. Gustaf Tisehus, of Stockholm,
and of Mr. Charles Bailey, of Manchester, who have kindly lent me
two valuable sets of continental '' F. flaitans," I have been able not
only to compare my series of British ///f/«^n)s-forms with those of
other comitries, but to obtain a fair notion of what botanists
generally mean by " P. Jluitans:' Amongst the plants sent to me
the majority seems to be formed of hybrids of P. 7uUaiis crossed with
r. liicens, or in some instances, perhaps, with P. pohjgomfoUm.
Of the small minority of more doubtful fiuitans-ioxm^, one, P.
Illhwensis Morong, belongs to the Zizii section of P. lucens, and the
others are freely fruiting plants, which seem to me specifically
distinct from the rest of the group, and which would be more
naturally placed between P. nutans and P. pi>li/fj