138 YORKSHIRE NATURALISTS' UNION. 



675. Rivularia Biasolettiana Menegh., 1841. 

 Mid W.— On stones in Covvside Beck, Arnclifife. 



This species has not previously been recorded for the British 



Isles. 



Genus GLCEOTRICHIA J. Ag., 1842. 



676. GlcEotrichia pisum (Ag., 1824) Thur. 1875. [Syn. 

 7 Rivularia echinulata Eng. Bot., 18 14; Echinella 

 ai'tiailata Eng. Fl.]. 



N.E.— Strensall (W. B. Turner). 



677. Gloeotrichia natans (Hedwig, 1798) Rabenh., 

 1847. 



Mid W. — Recorded in Lees' Flora of West Yorkshire, p. 767, 

 for Malham, 1789 ; this record is very doubtful. 

 N.W. — Lund's Fell, in a ditch. 

 N.E. — Pilmoor, near Thirsk. 



Family SIROSIPHONIACE^. 

 Genus HAPALOSIPHON Nag., 1849. 



678. Hapalosiphon Hibernicus West & G. S. West, 



1896. 

 N.W. — Bog near Widdale Beck. 

 N.E. — Pilmoor, near Thirsk. 

 S.E. — Skipwith Common. 



679. Hapalosiphon intricatus West. 

 Mid W. — Cocket Moss, near Giggleswick. 



Genus STIGONEMA Ag., 1824. 



680. Stigonema ocellatum (Dillw., 1809) Thur., 1875. 

 Mid W. — Cocket Moss, near Giggleswick. 



N.W. — Near Sedbergh. 

 N.E. — Pilmoor, near Thirsk. 



681. Stigonema minutum (Ag., 181 7) Hass., 1845. 

 S.W.— Denholme. 



Mid W. — Ingleton. 



682. Stigonema turfaceum (Eng. Bot., 1838) Cooke, 



Trans. Y.N.U., 1899 ("pub. July 1901). Bot. Series, Vol. 5. 



