W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 49 



Mid W.— -Markington, with zygospores 1 (Rev. J. S. Tute). 

 Askwith (W. B. Turner). Eaildon. Eldwick. Adel Bog. 

 Rombald's Moor, Farnley. Leadiley. Near Norwood Hall, 

 above Lindley Reservoir. Malham Tarn. Moughton Fell. 



r 



Wigton Moor. 



N.AV.—Mickle Fell 



N.E.— Gormire ; Strensall ! (W. B. Turner). Pilmoor, near 



ri-y 



rhirsk. Terrington. 



S.E. — Riccall and Skipwith Commons. Hornsea Mere. 



A form with a distinctly granulate membrane was observed 

 from Skipwith Common ; the granules were large, but of slight 

 elevation. 



193. Closterium Pseudodianse Roy. 



Mid W. — Roundhay Park, Leeds (vii. 1898). Cocket Moss, 

 near Giggleswick (iv. 1898). 



194. Closterium parvulum Nag. 



Generally distributed throughout the county. 

 S.W.— Doncaster. Ogden Clough. Wibsey (with zygospores). 

 Cullingworth. Bingley. Keighley Tarn, and near Keighley 



with zygospores). 



Mid W. — Adel. Wigton Moor. Eldwick. Baildon Moor. 

 Boston Spa. Cocket Moss, near Giggleswick. Ingleton. 

 Ribblehead. Harrogate. Staveley Dam, near Knaresborough. 



N.W.—Mickle Fell. Great Shunnor Fell. Lund's Fell. 



N.P^. — Strensall. Pilmoor, near Thirsk (with zygospores). 



rerrington. Near Scarborough. Levisham. Hayburn "Wyke. 

 S.E. — Riccall Common. 



Var. angustum var. nov. 

 Smaller than the typical form and considerably narrower. 

 Diam. 77 ft; apices 94-102 /x apart. 

 A^.E. — Pilmoor, near Thirsk. 



195. Closterium arcuatum Breb. 



S.E. ^Skipwith Common. 



L 



196. Closterium Jenneri Ralfs. 



S,W,— Wakefield (W. H. Dikes). Cullingworth, 





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