136 YORKSHIRE NATURALISTS' UNION. 



This occurred in large brilliant blood-red patches, covering 

 those stones and rocks which could not be displaced by the 

 rapidity of the current, and which are often left dry. Some few 

 cells had about a fourth-part of the contents still green. 



664. Pleurococcus nimbatus Wildem. 



N.W. — Abundant in a sphagnum bog, near Widdale Beck 

 (iv. 1898). 



N.E. — Terrington (vi. 1898). 



Genus TROCHISCIA Kiitz., 1845. 



665. Trochiscia hirta (Reinsch.) Hansg. 1888 [Syn. 

 Pahnella hirta '^€vc\%z\\.\Pleiirococcus Wi'///?/i' Reinsch.]. 



Mid W, — Arncliffe, on wet rocks. Boston Spa. 

 N.W.— Cowgill Wold Moss, Widdale Fell. 



666. Trochiscia aciculifera (Lagerh.) Hansg. 1888. 



[Syn. Aca?ithococcus aciculifera Lagerh., 1883]. 

 N.W. — Hunter's Hole, Craydale Moor (1,900 feet). 

 N.E. — Pilmoor, near Thirsk (vi. 1898). 



667. Trochiscia reticularis (Reinsch.) Hansg. 

 Mid W. — Near Knaresborough (viii. 1898). 

 N.W.— Cowgill Wold Moss, Widdale Fell. 



N.E. — Terrington (vi. 1898). 



Genus PROTOCOCCUS Ag., 1824. 



668. Protococcus viridis Ag. 



[Syn. Chlorococcum humicoluui (Nag.) Rabenh.]. 

 S.W. — Frequent about Bradford. 



MiD W. — Common about Leeds (Abbott, Emsley & Turner). 

 Baildon. 



N.W. — Common, Lund's Fell. 



669. Protococcus protogenitus (Bias.) Hansg. 



[Syn. Microcystis protogenita Rabenh.]. 

 S.W.— Saltaire. Wigton Moor. 

 S.E.— Routh. 



670. Protococcus botryoides Kiitz.) Kirchn. 



[Syn. Microhaloa botryoides Kiitz.] 



Trans. Y.N.U., 1899 (pub. July 1901). Bot. Series, Vol. 5. 



