382 l^AIADACEJE. IBi^pm. 



II. Clonea, Waterford; and— IV. Eaven Point, Wexford: JSart 

 1883 p. Plentiful on mud flats soutli of Wexford Harbour: 

 Marshall i8g6.—V. Pool by the sea at the Quarry, Howth {Praeger) : 

 Ir. Nat. z<5'9j-.— YI. Brackisti ditches at Kilrash, Clare, and Foynes, 

 Limerick: Stewart z8go.—IX.. Ballysodare, SUgo : Praeger.— 



XI. Brackish, ponds near the mouth of the river Erne, Bally- 

 shannon; R. P. Vowell. — XII. Plentiful in a salt marsh near 



I Portstewart [Stewart) : Flor. N.-E. Stream at Blackstaffi Bridge 

 near Kirkcubbin, Down: S. S^P. i8qs- 



Many of the older records are for the aggregate R. maritima 

 only, and the distribution of the segregates in Ireland is as yet very 

 imperfectly known. R. rostellata is apparently much more frequent 

 than R. spiralis. 



ZANNICHELLIA Linn. 

 1. Z. palustris Linn (aggregate) — Sorned Pond-weed. 



District I. II. — IV. V. VI. VII. VIII. IX. X. XI. XII. 

 Lat. 62i°-55J°. Throughout Ireland, probably. Type, British. 



Rivers, ditches, pools, and lake margins, in still water ; rather 

 frequent. Fl. June-August. 



Usually near the sea, but occasionally occurs far inland as in 

 Loughs Eee and Derg on the Shannon. 



Z. hraohystemon Gay. 



Districts I. — — — V. VI. VII. — — _ _ XIL 



I. Quarry hole near Castleisland, Kerry, 1888; R.W.S. — 

 V. Brackish ditch near Balbriggan ; pools by the Dodder near Eath- 

 farnham, Co. Dublin, 1893;— VI. Pool on Slieve Elva, Co. Clare, 

 1895; and — VII. DromineerHarbour, Lough Derg, 1896; N.C.— 



XII. At BlackstafE bridge, Kirkcubbin, Co. Down, 1890; Praeger, 

 In the river Quoile above Downpatrick, 1880 ; Stewa/rt. 



To 700 ft. in Clare \N.C.) ; but usually lowland. 

 This appears to be the commonest of the segregates in Ireland 

 as it is in Great Britain, and probably occurs in aU the districts. 



Z. pedunculata Eeichb. 



Districts I. — — — — — — — — — — — 



I. Banna and Ballyheigue, Kerry : R. W. S. i88g. In the 

 Cashen river, Kerry ; R, W. S. 



