W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 25 



Genus PROTODERMA Kiitz., 1843. 



80. Protoderma viride Kiitz., 1843 [Syn. Entodadia 



gracilis Hansg., 1888 ; Endoderma gracilis De Toni, 

 1889 ; Periplegmatium gracile Hansg., 1890]. 



S.W. — Near Bradford, epiphytic onElodea canadensis. Frizing- 

 hall, on Coleochate orbicularis. 



Mid W. — -Baildon, on Callitriche stagnalis and Nitella flexilis. 

 Boston Spa, on Callitriche. 



N.E. — Pilmoor, near Thirsk. Terrington. Malton. 



A small epiphytic, subparenchymatous alga; diameter of cells 

 3 "5—6 ^ 



Apparently widely distributed in England. 



Family CONFERVACE^. 

 Genus CONFERVA L., 1737; em. Lagerh., i888. 



81. Conferva bombycina Ag. 



S.W. — Norland Moor and Goole (H. F. Parsons). Liversedge ! 

 (Rev. W. Fowler). Bradford. Pontefract (H. F. Parsons). Heaton. 



Mid W. — Embsay. Adel Bog. Baildon. Eldwick. Boston 

 Spa. Cocket Moss, near Giggleswick. Ingleborough. Horton- 

 in-Ribblesdale. Penyghent. Whernside. Oughtershaw, and 

 Oughtershaw Tarn. Beamsley Beacon. 



N.W.— Mickle and Cronkley Fells. Great Shunnor Fell. 

 Hunter's Hole, Craydale Moor (1900 ft.). Mossdale Moor, 

 Widdale Fell. Lund's Fell. 



N.E. — Pilmoor, near Thirsk. Malton. Stokesley. Near Scar- 

 borough. 



S.E. — Waghen. Near Meaux Abbey. Newsholme. Market 

 Weighton. 



The most abundant species of the genus and widely distributed. 

 Forma minor Wille. 



S.W. — Denholme. Oxenhope. 



Mid W. — Baildon. Eldwick. Bride Cross, above Farnley 

 Moor. Otley. Penyghent. Near Oughtershaw Tarn. Whernside. 



N.E. — Pilmoor, near Thirsk. 



