I 



W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 39 



Family DESMIDIACEAl. 



Genus GONATOZYGON DeBary, 1856; em. 1858. 



147. Gonatozygon Ralfsii DeBary. 



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



worth (with zygospores). 



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

 Staveley Dam, near Knaresborough. Cocket Moss, near 

 Giggleswick. 



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



N.E.--StrensaU ! (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. Pilmoor, near Thirsk. 

 S.E. — Riccall and Skipwith Commons. 



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

 Mid W. — Cocket Moss, near Giggleswick. 

 S.E. — Riccall Common. 



Var. Iseve (Hilse) Nob. 



[Syn. G. Iceve 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. 



Mm W. — Malham Tarn, abundant in washings of Callitriche^ 



(vii. 1 891). Penyghent. 

 N.E. — Strensall Common. 



Genus SPIROT/ENIA Breb., 1844. 



151. Spirotaenia condensata Breb. 



S^\y,_.Ogden Clough (length of cell, 186-192 ^; breadth, 

 26-28 ft). CuUingworth, 



\ 



