W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 77 



S.E. — Riccall Common. 



347. Cosmarium humile (Gay) Nordst. 



[Syn. C. celatum Gay]. 

 Var. substriatum (Nordst.) Schmidle. 



[Syn. C. substriatum Nordst.]. 

 S.W. — Rawcliffe Common. 



Mid W. — Penyghent. Staveley Dam, near Knaresborough. 

 Wigton Moor. 



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

 S.E. — Riccall Common. Skipwith Common. Market Weigh- 

 ton. Hornsea Mere. 



Var. striatum (Boldt) Schmidle. [Syn. C. striatum Boldt]. 

 N.E. — Pilmoor, near Thirsk. 



C. humile, C. striatum, C. substriatum, and C. danicum are 

 unquestionably all forms of the same species. This was first 

 directly pointed out by Schmidle in Flora oder Allg. Bot. Zei- 

 tung, 1894, heft I, p. S3 ; he afterwards placed C. striatum, 

 C. substriatum, C. danicum, C. subhumile, and other forms as 

 varieties of C. humile ; cfr. Oesterr. Botan. Zeitschrift, 1895, 

 nr. 7, p. 18 (Sep.). 



348. Cosmarium Blyttii Wille. 



S.^V. — Cragg Vale, towards Blackstone Edge. 

 Mid W. — Cocket Moss, near Giggleswick. 

 N.AV. — Mickle and Cronkley Fells. 

 S.E. — Skipwith Common. 



349. Cosmarium Boeckii Wille. 

 Mid W. — Malham Tarn. 



N.W.— Mickle Fell. 



350. Cosmarium subprotumidum Nordst. 

 N.E. — Strensall Common. 



Var. Gregorii (Roy & Biss.) Nob. 



[Syn. C. Gregorii Roy & Biss.]. 

 Mid W. — Roundhay Park, Leeds. 

 N.E. — Pilmoor, near Thirsk. 

 S.E, — Hornsea Mere. 



