< 



i 



I 



W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 2 1 



Var. bicolor (Eng. Bot.) Nob. [Syn. Conferva bicolor Eng. 



Bot., 1790 — 1814; Hor77iiscia speciosa {fZ-^im..^ ^'^2i'^ 



Rabenh., 1868; H. zonata var. valida (Nag., 1849) 



Rabenh., 1868]. 



More or less abundant in mountain streams, more especially 



in the earlier months of the year. 



S.AV.— Crimsworth Dean. Holden Ghyll, near Keighley. 

 Mid W.— Leathley. Linn Ghyll. Crook Ghyll near Buckden. 

 N.W.— Near Sedbergh. Near the 'Moorcock Inn'. Cotterdale. 

 Abundant in the River Ure (iii. 1889). 



Genus RIIAPHIDONEMA Lagerh., 1892. 



61. Rhaphidonema nivale Lagerh. 



MiD W. — Langcliffe, near Settle (viii., 1896). 

 Thickness of filaments, 2-5— 3-5 /;.; total length of filaments, 

 94— i23j«- 



■ 



Not previously recorded for the British Isles. 



Genus IIOKMOSPORA Breb., 1S40. 



62. Hormospora ordinata West & G. S. West. 



Mid W.~Cam Fell. 



The small size of the cellsj their remoteness and comparative 



^^ r 



shortness sufficiently differentiate this species. The cell^contents 

 are bright green and very granulose. 



<^l. Hormospora dubia Schmidle. 



S.W. — In horse- trough, Allerton, near Bradford (vi., 1898). 



This species has not previously been recorded for the British 

 Isles. 



Genus GLQiOTILA Kiitz., 1S43. 



64. Gloeotila protogenita Kiitz. 



N.E. — Pilmoor, near Thirsk. 



Previously unrecorded for the British Isles. 



Genus GEMINELLA Turp., 1S28. 



(>%. Geminella interrupta Turp., 1828; em. Lagerh., 

 1883. 



N.E. — Pilmoor, near ThirsL 



^■fV'^lj^ 



Bot. 5— B 



