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



AH -measurements are given in mm. or thousandths of a 

 mm. (ju.). I y^^'ooi mm. 



Of the complete alga-flora at least 55 species have not 

 previously been recorded fey the British Isles; special mention 

 is made of this under the species. Mention is also made of 

 those varieties and forms which are similarly new records to 

 Britain. 



The following call for particular notice: — 

 Hormiscia zonata (Webb & Mohr.) Aresch. var. bicolor (Eng. 



Bot.) Nob. 

 Debarya calospora (Palla) Nob. 



Penium curtum Breb. var. obtusum West & G. S. West. 

 Closterium parvulum Nag. var. angustum AA''est & G. S. West. 

 Closterium sigmoideum Lagerh. & Nordst. forma majoi'. 

 Closlerium acutum (Lyngb.) Ralfs var. linea (Perty) Nob. 

 Xanthidium variabik West & G. S. West. 

 Cosmarium subpiotumidum Nordst. var. Gregorii (Roy & Biss.) 



Nob. 

 Cosmarium Pokornyanuni (Grun.) Nob. 

 Cosmarium cymatopleurum Nordst. var. Archerii {E.oy & Biss.) 



Nob. 

 Cosmarium tetragonum (Nag.) Arch. var. Davidsonii {Koy and 



Biss.) Nob. 

 Cosmarium Willei Nob. var. ordinatum West & G. S. West. 

 Cosmarium pericymatium Nordst. var. eboracense West & G. S. 



West. 

 Staurastrum gladiosum Turn. var. delicafulum^est & G. S. West. " 

 Staurastrum piholatum Breb. var. ^>-a«7«V««(B6rg.)Liitkem. 

 Rhaphidium setigerum (Schroder) Nob. 



