W. WEST AND G. S. WEST: ALGA-FLORA OF YORKSHIRE. 135 



657. Stichococcus dissectus Gay, 1891. 



S.W. — Eccleshill, near Bradford ; on damp ground, old wood, 

 tree-pots, etc., Bradford. Swill Hill. 

 Mid W.— Baildon Moor. 



658. Stichococcus flaccidus (KUtz., 1849) Gay, 1891. 



[Syn. Ulothrix flaccida Kiitz., 1849]. 

 S.W. —Bradford. 



Mid W. — HawksAvorth. Boston Spa. 



659. Stichococcus fragilis (A. Br.) Gay, 1891. 



[Syn. Arthrogoniuvi fragile A. Br.]. 



S.W. — In greenhouse, Bradford, forming a thin gelatinous 



stratum with Dadylothece Braimii Lagerh. 



This species has not previously been recorded for the British 



Isles. 



Genus EREMOSPH.ERA DeBary. 



660. Eremosphaera viridis DeBary. 



Mid W. — Malham Tarn Bog. Cam Fell. Bog two miles 

 south of Clapham. 



N.W.— MickleFell. Cronkley Fell. Bog near Widdale Beck. 

 N.E. — Strensall ! (W. B. Turner). Pilmoor, near Thirsk. 



Genus PLEUROCOCCUS Menegh., 1S42. 



661. Pleurococcus vulgaris Menegh. 



S.W., Mid W., N.W., N.E., and S.E.— On old wood, bark, 

 etc., in moist situations, everywhere throughout the county. 



662. Pleurococcus angulosus (Corda) Menegh. 

 Mid W. — Penyghent. 



663. Pleurococcus rufescens (Kutz.), Breb. 



Mid W. — Forming a red stratum on wet limestone rocks, 

 Boston Spa (iv. 1897). Ingleton. Jackdaw Crag, near Tadcaster. 

 Var. sanguineus West & G. S. West. 



A variety forming a dense soft mucous layer of a bright blood 

 colour, contents of cells granulose, and of the colour of arterial 

 blood. 



Mid W. — Tennant Ghyll, a small tributary of Cowside Beck, 

 Arncliffe (Aug., 1896). 



