138 YORKSHIRE NATURALISTS' UNION. 



675. Rivularia Biasolettiana Menegh., 1841. 

 Mid W. — On stones in Cowside Beck, Arncliffe. 



This species has not previously been recorded for the British 



Isles. 



Genus GLCEOTRICHIA J. Ag., 1842. 



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

 7 Rivularia echimilata Eng. Bot., 1814; Echinella 

 articulata £ng. 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 STIGOXEMA 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., 1817) Hass., 1845. 

 S.W.— Denholme. 



Mid W. — Ingleton. 



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

 1884. 



Trans. Y.N.U., 1899 Cpub. July 1901). Bot. Series, Vol. 5. 



