W. wp:St and g. s. west: alga-flora op Yorkshire. 57 



Var. linea (Perty) Nob. [Syn. Closterium Unea Perty]. 



Mid W. — Cocket Moss, near Giggleswick. Cowgill Wold 

 Moss, Widdale Fell. 



N.W.— Mickle Fell. 



Closterium linea differs so little from C. acutum that it can 

 only be considered as a variety of the latter species. Moreover, 

 the zygospores of the two plants are precisely alike. 



235. Closterium subulatum (Kiitz.) Breb. 



Mid W. — Rombald's Moor, very abundant, associated with 

 Cosmariuin pseudarcloiim in washings of Potainogeton polygoni 

 folius. Cocket Moss, near Giggleswick. Cam Fell. 



N.W.— Great Shunnor Fell. Lund's Fell. Hunter's Hole, 

 Craydale Moor (1,900 feet). 



236. Closterium Ralfsii Breb. 

 S.W.— CuUingworth. 



237. Closterium Ktitzingii Breb. 

 S.W.— Goole ! (W. B. Turner). 



Mid W. — Cocket Moss, near Giggleswick. 

 N.E. — Strensall. Pilmoor, near Thirsk. 



238. Closterium rostratum Ehrenb. 



S.W. — Goole (H. F. Parsons). Greetland, near Halifax. 

 Wibsey. Nab Wood, near Bingley (with zygospores). CuUing- 

 worth. 



Mid W. — Markington ! (Rev. J. S. Tute). Askwith Moor 

 (W. B. Turner). Adel Bog! (J. Abbott). Eldwick. Wigton 

 Moor. Cocket Moss, near Giggleswick. Giggleswick Common. 

 Bowland Knotts. Pateley Bridge (with zygospores). Boston 

 Spa. Cam Fell. 



N.W.— Great Shunnor Fell. Cronkley Fell. 



N.E. — Strensall. Terrington. 



Generally distributed throughout the county, but not so 

 frequent as in the south of England. 



239. Closterium setaceum Ehrenb. 



S.W.— Rawcliffe Common. Wakefield (W. H. Dikes). 



