2 



Davies gathered it, Mr. Borrer, Mr. Webb, Mr. A. G. More, 

 Prof. Babington, and Mr. C. Bailey have collected it. In 

 1880 I fouud it in Burwell Fen, Cambridgeshire, and since 

 then it has been sent me amongst unnamed specimens by 

 Mr. Orr, of Dublin, gathered in Co. Down. It is perhaps 

 the most interesting species in the British flora, seeming to 

 be a strictly endemic species, as it has not been known any- 

 where else in the world. It has only been known to fruit 

 once, and then only two fruits were perfected, in my garden, 

 from the Cambridge specimens. From this fact it is probable 

 it may be a remnant of an older flora, when Britain enjoyed 

 a warmer climate than at present ; at least this is suggested 

 by Dr. Nyman, of Stockholm. 



Potamof/eton Zizii, Roth. — Found in Cauldshiels Loch, 

 Eoxburgh, by Mr. Brotherston, of Kelso ; afterwards sent me 

 by Mr. Bailey from the English Lakes, and this summer by 

 Mr. Fryer from Cambridge and Hunts ; and only last Sep- 

 tember Mr. Beeby discovered it in Hedge Court Mill-pond, in 

 S.E. Surrey. It is not a common plant in Europe, but 

 extends to N. America. 



Potamogeton OrijjUthii, Ar. Bennett. — Found in Lly-an-afon, 

 near Aber, Carnarvon, at 1250 ft. elevation. Mr. Grifiiths 

 sent me a series of specimeiis from this lake, and after com- 

 paring them with all known species I was unable to refer it 

 to any. I named it after its discoverer, who had worked most 

 energetically at the N. Wales flora. I am glad to say that 

 my friend Dr. Tiselius, of Stockholm, and the Rev. Mr. 

 Morony, of the United States, concur in thinking it a new 

 species, their opinion being valuable as they have been 

 students of the genus for many years. It is difficult to 

 believe in a plant being confined to a single Welsh lake, and 

 the result of isolation should be well considered ; but it 

 cannot be refen-ed to any described species. 



Naias gravmiea, Del., var. Delilei, Magnus. — In a mill-pond 

 near Ashton, Lancashire, in water kept tepid by the con- 

 densation of steam by a mill. It is a native of tropical and 

 subtropical countries, and has probably been introduced with 

 cotton from Egypt. 



