160 FOTAMOGETONACE^. 



on Rathlin Island; S.A.S. "Was found in Loughmoume 

 until 1880. 

 Derry — Bare, only observed in one of the small lakes above Kilrea; D.M. 



9. P. perfollatus Linn. 



Lakes, streams, and ditches — common. Fl. July and first half of Aug. 



10. P. crispus Linn. 



Lakes, ditches, and quiet streams— common. Fl. mid. June till mid. 

 Aug. 



Var. /3 P. SERKATUS Hudson. 



In the Bann near Portglenone, Antrim and Derry ; perhaps not rare ; 

 S.A.S. Under the name F. compressum Mr. Templeton notices a pond weed 

 occiurring in the Bann. His note says "leaves finely serrate," and hence 

 we conclude that the plant was incorrectly determined, and was also 

 Hudson's F. serratus. 



11. P. obtusifolius Mert.^Koch. 



Lakes, and drains — rare. Fl. July and early part of Aug. 

 Down — Ballyalloley near Comber ; Flor. Belf. {sub F. compressus). 



Aughnadarragh Lake near Saintfield, Derry Lake, and 



Magherascouse Lake ; S.A.S. Munce's dam near Dun- 



donald; R.Ll.P. 

 Antrim — Drains at Portmore ; Tejnpleton, 1795. Abundant at Portmore ; 



Cyb. Hib. 

 Derry— Enagh Lough, and Lough Lug near Moneymore ; D.M. 



The original authority for the reported occurrence of this species in the 

 Lagan was by no means a critical botanist, and as the plant cannot be 

 found there that record may be expunged. There is also a note of its 

 occurrence in Islandmagee, but for a somewhat similar reason this station 

 is likevrise omitted. 



12. P. puslllus Linn. 



Lakes, ponds, ditches, and streams — common. Fl. July and Aug. 

 Occurs at 1150 feet in the Moume Mountains; Hart. The var. F. 

 tenuissima is much the more common form. 



13. P. pectlnatus Linn. 



Lakes and rivers— frequent. Fl. Jxily and Aug. 



Down— Pond at Castle Espie, Saintfield lakes. Lough Aghery near 

 Ballynahinch, Annsboro' Lake near Castlewellan, and abun- 

 dant in the Quoile at Downpatrick ; S.A.S. Marshes by the 

 Strand Lake near Killough ; T.H.C. 



Antrim — Crumlin River near the waterfoot, and in drains between Port- 

 more and Lough Neagh ; Templeton, 1808. Lagan canal; 



