498 Proceedings of the Royal Irish Academy. 



4. Riccia glaucescens Carrington. 



^1 glaucescens Carrington, in Carr. & Pears., Hepat. Brit. Exsicc, 

 fasc. 1, no. 66. Riccia Michelii Raddi, Lindb., Muse. Scand., p. 2, 

 1879. Riccia lifurca Hoffm., Steph., Sp. Hepat., p. 30, 1900. 

 Riccia glaucescens Carr., Pearson, Hepat. Brit. Isles, p. 493, plate 

 222. 



Districts XI. XII. 



Sal. — On damp mud- covered rocks and stubble fields. 



XI. In a stubble field near Lough Salt, Sept. 1902 : McA. 



XII. On rocks in Glendun Eiver, Co. Antrim, 1 895 : Brenan & 

 Lett, Journal of Botany, vol. xxxiii., p. 283, 1895. 



Genus 51. Ricciella Braun. 

 Ricciella fluitans Linn., Braun. 



Riccia fl%itans Linn,, Sp. PL, 1606. Lindenberg, Monogr. Ricc.^ 

 p. 443, tab. 24-25. Hook, et Taylor, Muscol. Brit., ed. ii., p. 213. 

 Dumort., Hepat. Europ., p. 171. Rieciella fluitans Braun, Bot. Zeit., 

 p. 754, 1821. Moore, Irish Hepat., p. 606. Pearson, Hepat. Brit. 

 Isles, p. 495, plate 224. 



Districts Y. VI. IX. X. — XII. 



Hab. — Floating in stagnant pools and ditches. 



Y. Side of the River Boyne above Drogheda : Moore 1876. Ditches 

 at North Wall, Dublin : Wade Rar. 1804. 



YI. Ditches near the Shannon, Co. Limerick : Moore. 



IX. Among Lemna, ditch by the Shannon below Carrick, Co. 

 Leitrim, June 1899 : Praeger. 



X. Closet River and bog drains near Raughlan, Co. Armagh : Lett. 

 XII. Lough ]S'eagh, where the canal joins the lough at Lurgan, 



Co. Down : Moore. Abundant in a drain at Meenan Bog, Loughbrick- 

 land, Co. Down : Lett 1890; Stewart 1895. Several places in Newry 

 Canal: Stewart 1888; Lett 1890. Lagan Canal at Kilmore, Co. 

 Down : Waddell in Guide to Belfast, 1902. 



Genus 52. Ricciocarpus Corda. 



Ricciocarpus natans Linn., Corda. 



Fiiccia natans Linn., Syst. Nat., ed. v., vol. xii., p. 2, 1753. Eng. 

 Bot., tab. 252. Ricciocarpus natans Corda, in Opiz., Nat., p. 651. 

 Moore, Irish Hepat., p. 607. Pearson, Hepat. Brit. Isles, p. 497, plate 

 225. 



