w. west and g. s. west : alga-flora of yorkshire. 39 



Family DESMIDIACE^. 

 Genus GONATOZYGON DeBary, 1856 ; em. 1858. 



147. Gonatozygon Ralfsii DeBary. 



S.W. — Hebden Bridge, abundant in dam (viii. 1895). Culling- 

 worth (witb zygospores). 



Mid W. — Moor AUerton (W. B. Turner). Wigton Moor. 

 Staveley Dam, near Knaresborough. Cocket Moss, near 

 -Giggleswick. 



N.W. — Sedbergh, abundant (with zygospores, ix. 1899). 



N.E.— Strensall ! (W. B. Turner). "• 



S.E. — Riccall Common. 



148. Gonatozygon Brebissonii DeBary. 

 S.W.— CuUingworth. 



Mid W. — Adel Bog. Malham Tarn. Cocket Moss, near 

 Giggleswick. Penyghent. Cam Fell. 

 N.W. —Great Shunnor Fell. 

 N.E. — Strensall. Pilraoor, near Thirsk. 

 S.E. — Riccall and Skipwith Commons. 



Var. minutum Nob. [Syn. G. mimitum West]. 

 Mid W. — Cocket Moss, near Giggleswick. 

 S.E. — Riccall Common. 



Var. laeve (Hilse) Nob. 



[Syn. G. IcBve Hilse, 1878; West, 1889]. 

 Mid W. — Cocket Moss, near Giggleswick. Penyghent. 

 N.W.— Mickle Fell. 



149. Gonatozygon pilosum Wolle. 

 S.E. — Skipwith Common. 



150. Gonatozygon Kinahani (Arch.) Rabenh. 



Mid W. — Malham Tarn, abundant in washings of Callitriche, 

 (vii. 1891). Penyghent. 

 N.E. — Strensall Common. 

 \. Genus SPIROT^NIA Brib., 1844. 



P 151. Spirotsenia condensata Brdb. 

 S.W. — Ogden Clough (length of cell, 186-192 m ; breadth, 

 26-28 /*). CuUingworth, 



