W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 1 9 



54. Hormidium parietinum (Vauch.), Kiitz. 



[Syn. Ulothrix parietina Kiitz., 1849]. 

 S.W.— Dewsbury (C. B. Crawshaw and C. P. Hobkirk). 

 Halifax. Bradford. 



Mid W. — Leeds. Skipton. 



Genus HORMISCIA Fries, 1835; em. Aresch., 1866. 



55. Hormiscia subtilis (Kiitz.), DeToni. 



[Syn. Ulothrix subtilis Kiitz.]. 

 S.W.— Ogden Clough. 

 Mid W. — Bowland Knotts. Wigton Moor. 

 N.W.— Dodd Fell, at 2,000 feet. 



Var. subtilissima Rabenh., 1868. 



[Syn. Ulothrix subtilissima Rabenh., 1863]. 

 S.W.— Bradford (ix. 1896). 



Mid W. — Baildon (iv. 1895), amongst mosses on dripping 

 rocks. Cells i| — 4 times longer than the diameter, with a very 

 pale green, parietal chlorophyll-plate : thickness 4 ju. 



Var. variabilis (KUtz.), Kirchn. 



[Syn. Ulothrix variabilis Kiitz.]. 



S.W.--Holmfirth (C. P. Hobkirk). Crimsworth Dean. Ogden 

 Clough. Horton. Heaton. Keighley. Cragg Vale, towards 

 Blackstone Edge. 



Mid W. — Shipley Glen. Hawksworth. Earl's Seat. Bride 

 Cross, above Farnley Moor. Langcliffe. Simon's Fell. Linn 

 Ghyll, Ribblehead. Malham. 



N.W.— Cowgill Wold Moss, Widdale Fell. Bog near Wid- 

 dale Beck. Cronkley Fell. 



N.E. — Carlton Bank. Near Scarborough. Pilmoor, near 

 Thirsk. Malton. 



Var. tenerrima (Kiitz.), Kirchn. 



[Syn. Ulothrix tenerrima Kiitz.]. 

 S.W.— Ogden Clough. Swill Hill. Holmfirth (C. P. Hobkirk). 

 Barnsley. Bradford. Heaton. Keighley Moor. 



