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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 ; JLndoderma gracilis De Toni, 

 889 ; Feriplegmatimn gracile Hansg., 1890]. 



S.W.— Near Bradford, epiphytic on Elodea canadensis. Frizing- 

 hall, on Coleocluite orbicularis. 



Mid W. — Baildon, on Callitriche sfagnalis and Nitella fiexilis. 

 Boston Spa, on Callitriche. 



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



A small epiphytic, subparenchymatous alga; diameter of cells 



3 '5— 6 /A 



Apparently widely distributed in England. 



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Family CONFER VACE.E 



Genus CONFERVA L., 1737; em. Lagerh., 188S. 



81. Conferva bombycina Ag. 



S.W. — Norland Moor and.Goole (H. F. Parsons). J^iversedge! 

 (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, Beanisley 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 AVille. 



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S.W. — Denholme. Oxenhope. 



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

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

 N.E. — Pilmoor, near Thirsk. 



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