Il6 YORKSHIRE NATURALISTS' UNION. 



Genus SORASTRUM KUtz., 1S45. 



554. Sorastrum spinulosum Nag., 1849. 



N.E. — Strensall (W. B. Turner). Pilmoor, near Thirsk. 



Genus PEDIASTRUM Meyen, 1829. 



555. Pediastrum angulosum (Ehrenb.), Menegh. 

 S.W.— Wakefield (W. H. Dikes). 



Mid W. — Malham Tarn. Penyghent. Ribl^lehead. 

 N. E. — Scarborough Mere. 



556. Pediastrum Boryanum (Turp.), Menegh. 

 S.W.— Doncaster. RawcUffe. Askern (Rev. F. H. Allen). 



Manningham. Calverley. Bingley. 



Mid W.— Markington ! (Rev. J- S. Tute). Hawksworlh. Wig- 

 ton Moor. Austwick. Ben Rhydding. Malham Tarn. Lang- 

 cliffe, near Settle. 



N.W.-Mickle Fell. 



N.E.— Strensall ! (W. B. Turner). Malton. Stokesley. Scar- 

 borough Mere. 



S.E. — Skipwith Common. Sandholme. Hornsea Mere. 



Var. granulatum (Kutz.), A. Br. 

 Mid W. — Adel (J. Abbott). Staveley Dam, near Knarcs- 

 borough. 



N.E. — Strensall (W. B. Turner). Pilmoor, near Thirsk. 

 S.E.— Sandholme. Market Weighton. 



557. Pediastrum glanduliferum Benn. 

 N.W. — Near Jervaulx Abbey (vii. 1898). 



558. Pediastrum constrictum Hass. 

 S.W.— Frizinghall. 



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

 S.E. — Skipwith Common. 



559. Pediastrum duplex Meyen, 1829. 



[Syn. P. pertiisum Kiitz., 1845]. 

 S.W.— Wakefield (W. H. Dikes). Frizinghall. 

 Mid W. — Roundhay Park, Leeds. Malham Tarn Bog. 



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



