W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 97 



446. Staurastrum Dickiei Ralfs. 

 S.W.— CuUingworth. 



Mid W. — Black Hill, near Settle. Wigtoii Moor. Adel. 

 Bride Cross, above Farnley Moor. Ribblehead. Cam Fell. 

 N.W.— Lund's Fell. Cowgill Wold Moss, Widdale Fell. 

 N.E.— Strensall. Carlton Bank. 

 S.E. — Riccall Common. 



447. Staurastrum glabrum (Ehrenb.) Ralfs. 



Mid W. — Cam Fell, abundant (viii. 1896). Bog two miles 

 south of Clapham (iv. 1898). 

 N.W.— Mickle Fell. 



448. Staurastrum brevispinum Breb. 

 Mid W. — Malham Tarn. 



N.E. — Pilmoor, near Thirsk. 

 S.E. — Riccall Common. 



449. Staurastrum cuspidatum Br^b. 

 S.VV.— CuUingworth. 



Mid W.— Ilkley (W. H. Dikes). 

 N.W.— Mickle Fell. 

 N.E.— Gormire (W. B. Turner). 

 S.E. — Riccall Common. 



Var. divergens Nordst. 

 Mid W. — Whernside. 



Var. maximum West. 

 Mid W. — Malham Tarn. 



450. Staurastrum O'Mearii Arch. 



Mid W. — Cocket Moss, near Giggleswick. Bog two miles 

 south of Clapham. 



451. Staurastrum lunatum Ralfs. 

 Mid W, — Malham Tarn. 



N.E. — Scarborough Mere. 

 S.E. — Riccall Common. 



452. Staurastrum subcruciatum Cooke & Wills. 



Mid W. — Wigton Moor. 



453. Staurastrum Avicula Brdb. 

 Mid W.— Malham Tarn, Penyghent, 



