W. WEST AND G. S. WEST: ALGA-FLORA OF YORKSHIRE. 2 15 



Var. recta (Hantzsch) V.H. 

 S.W.— Hatfield district (M. H. Stiles). 



1018. Nitzschia lanceolata W. Sm. 

 S.W. — Roche Abbey (E. Hunter). Near Mirfield. 

 Mid W. — Roundhay ; South Milford ; Killingbeck (W. B. 

 Turner). 



N.E.— Strensall ! (W. B. Turner). 



.1019. Nitzschia Palea (Kiitz.) W. Sm. 



S.W. — Hatfield district (M. H. Stiles). Allerton. Crimsvvorth 

 Dean. Cragg Vale, towards Blackstone Edge. Marley, near 

 Bingley. 



Mid W. — Rombald's Moor. Boston Spa. Near Buckden. 

 Bog, two miles south of Clnpham. Malham Tarn Bog. 

 Moughton Fell. 



N.W.— Mickle Fell. 



N.E. — Pilinoor, near Thirsk. Ingleby Greenhow. Saltburn. 



S.E. — Market Weighton. Wressle. Newsholme, near Howden. 

 Cottingham; Stoneferry (G. Norman). 



Var. fonticola Grun. 

 Mid W. — Baildon. Harrogate. 



Var. debilis V.H. 

 S.W.— Saltaire. Cullingworth. 

 Mid W. — Rombald's Moor. 

 N.W. — Jervaulx Abbey. 



Var. tenuirostris V.H. 

 S.W. — Horton Park, Bradford. Near Shipley. 

 N.W. — Jervaulx Abbey. 



1020. Nitzschia communis Rabenh. 

 S.W. —Allerton. Horton Park, Bradford. 

 N.W. — Jervaulx Abbey. 



1021. Nitzschia amphibia Grun. 



S.W. — Near Bingley. 

 N.W.— Mickle Fell, 



