Potamogeton.] potamogetonace^. 31 1 



ditches near Hollymount, Mayo ; A. 0. M. — 12. At Magil- 

 ligan, Derry, and not unfrequent in bog ditches in Antrim ; 

 D.M. 



4. P. rufescens (Schrad.) — Reddish Pond-weed. 

 P. lucens var. Bentham. 



Districts 12-4-678- 10 11 12 

 Lat. 51°-56°. From South to North of Ireland. 

 Type in Great Britain, British. 



Ditches and streams ; rather rare. Fl. July. 



1 and 2. Rare near Cork, but found by Mr. Carroll in both 

 divisions of the County. — 2. Corrin bog, near Fermoy, rare ; 

 Mr. T. Chandlee. — 4. Ditches on the Murrough of Wicklow ; 

 D. M. — 6. Ditches near Limerick, but not common ; Flor. 

 Hih. — 7. Belvedere Lake, West-Meath ; B. M.—8. Near 

 Gal way; Prof. Melville. — 10. Belturbet, Cavan; B. M. — 



11. On the race-course bog, near Londonderry; D. M. — 



12. Enagh Lough, and in the river Eoe, Derry. BaUymena, 

 Antrim ; B. M. In the Lagan Canal ; Flor. Ulst, 



? 5. p. laneeolatus (Sm.) — Lanceolate-leaved Pond-weed. 

 P. lucens var. Bentham. 

 Districts 1 ------8--- 12 



Lat. 51°-56°. From South to North of Ireland. 

 Type in Great Britain, uncertain. 



Ditches and streams ; rare. Fl. July, August. 



1. Near Gap of Dunloe, Killarney (D. M.) ; C. G. B.— 

 8. Ditch between the marble quarry and '' the Recess," 

 Connemara (I. Carroll) ; C G. B. — 12. In the Mayola river, 

 near Shane's Castle, Antrim (D. M.) ; G. C. B. 



We do not profess to be well acquainted with this plant, 

 which may ultimately prove to be a form of some other 

 species, altered by growing in running or deep water. The 

 Irish specimens appear different from P. laneeolatus gathered 

 in Anglesea. 



["P. s-parganiifolms (Laest.)" is another little understood 

 plant which we think best to leave for future observation. 

 It grows abundantly in the river near the hotel at Maam, 

 Galway.] 



