\V. WEST AND G. S. WEST : ALGA-PLORA OF YORKSHIRE. 79 



N.W.— Mickle Fell. Jervaulx Abbey. 



N.E. — Strensall Common. Pilmoor, near Thirsk. Carlton 

 Bank. 



S.E. — Riccall and Skipwith Commons. Sandholme. Horn- 

 sea Mere. 



This is the most universal and widely distributed species of 

 the genus Cosmarium. 



Var. subgranatum Nordst. 



S.W.— Crimsworth Dean. 



Mid W. — Baildon. Ingleton. Half-a-mile south of Cray 

 Moss. Boston Spa. Knaresborough. Holden Ghyll, near 

 Keighley. 



N.E. — Pilmoor, near Thirsk. 



S.E.— Malton. 

 360. Cosmarium Pokornyanum (Grun.) Nob. [Syn. 

 Euastrum Pokornyamun Grun., 1868 ; E. binale var. 

 angustatwH Wittr., 1872 ; E. polare Nordst, 1872 ; 

 C. angustatum (Wittr.) Nordst., 1875]. 



Mid W. — Helln Pot, near Selside, on wet rocks among Glmo- 

 capsa sp. Moughton Fell. Penyghent. South of Cray Moss. 



N.W.— Mickle Fell. Mossdale Moor, Widdale Fell. Cowgill 

 Wold Moss, Widdale Fell. 



The description of Euastrum Pokornyanum, given by Grunow 

 in Rabenh. Flor. Europ. Alg., iii., p. 185, agrees in every way 

 with C. angustatum (Wittr.) Nordst. It is as follows : — '.£. minu- 

 tum, quasi prior is [E, Ralfsii Rabenh.] infans ; semicellulis 

 trilobis, lobis basalibus brevibus integris vel margine crenato- 

 bilobulatis, lobo polari porrecto subcuneato, apice truncato, leniter 

 inciso-emarginato ; cytiodermate lavi! The size of the plants is 

 the same, and the habitats '/« locis paludosis' and 'inter muscos 

 madidos' given for E. Pokornyamcm are those of C. angustatum. 

 Moreover, E. Pokornyanum Grun. var. subcrassicolle Gutw. (in 

 Spraw. Kom. fizyjogr. Akad. Umiej. Krakow, tom. xxx., p. 103, 

 t. iii., f. 40) could unquestionably be referred to C angustatum, 

 and therefore Gutwinski, by referring a form of C. angustatum to 



