Potamogeton.] NAIADACEJE. 381 



16. P. filiformis 'EoW^— Slender Pond-weed. 



P marinus Linn. 



Districts YII. Vm. IX. X. XI. — 



Lat. 53^°-65°- Norttem talf of Ireland. Type, ^cotiiSa.. 



Lowland. Lakes and canals ; rare and local. Fl. June-Jnly. 

 VII. Preiiuent in Lough Eee : B.^V. IBS'/.— Ylll. and 



IX. Abundant in shallow water in Lough. Cullin, at the outlet of 

 the river which falls into the Moy, 1864: More Serb. ^ Cyb. — 



X. Between Kinnausy Island and Kesh, Lough Erne : Bwrrington 

 1884.. In Lough Neagh east of Ardmore Point : Praeger i8g^. — 



XI. South side of Kinny Lough, Panet, Donegal : Hart 1880. 

 First found by A. G. More, in Lough Cullin, in 1864. 



EUPPIA Linn. 



1. E. maritima Linn. (Aggregate) — Tassel Pond-weed. 



Districts I. II, — IV. V. VI. — VIII. IX. — XI. XII. 



Lat, 51J°-55i°. Coasts of all Ireland. Type, British. 



Brackish pools and ditches ; not infrequent. Fl. July-August. 



R. spiralis Hartm. 



Districts I. IV. V. — — — — — XL XII. 



Lat. 52i°-55°. Trom South to ISTorth. 



I. In Castlegregory Lake, Kerry, and in the stream from it ; 

 brackish ponds by Barrow Harbour, Kerry : R. W. S. i88q Sf z8(pz. — 

 IV. Courtown Harbour, Wexford (Praeger) : Ir. Nat. i8g4. 

 "Wexford Harbour : Marshall i8g8. — V. In tidal river-reaches near 

 the head of Malahide estuary, Co. Dublin, abundantly in two 

 stations, near Lissen,HalI and near Newport House : iV. C. i8g^. — 

 XI. Near Mulroy House, Donegal ; Sart. — XII. Brackish pool at 

 Comber, Co. Down, 1886 ; Magheramorne, Larne, 1897 : Stewart in 

 Eerh. 



R. rostellata Koch. 



Districts I. II. — IV. V. VI. IX. — XL 



Lat. 51i°-55i°. From South to North. 



I. BaUybunnion, Kerry : Stewart i8go. Common around the 

 Kerry coast : R. W. S. i88g. Crookhaven, Cork ; Phillips. — 



