227 



155. C. Naegelianum Bréb. 



Foiind by Rostrup (Fær. Fl. p. 90) in »damp peaty soil near 

 Sandegærde« (Str.). 



156. C. crenatum Ralfs. 



Occurs in gatherings from Gliversrejn (Str.); Nolso; and 

 Trangisvaag (Syd.). Also found by Wille (I. c. p. 26) who further 

 mentions having found: 



F. cpenæ laterales 2 Nordst. Desm. Spetsb. p. 30, tab. 6, fig. 8. 



157. C. subcrenatum Hantzsch. 



Nordstedt Desm. arct. p. 21, tab. 6, fig. 10. 



Found in gatherings from Hqjvig and Gliversrejn (Str.); and Tran- 

 gisvaag (Syd.). Wille has also found this species (1. c. p. 27). 



158. C. Nathorstli Boldt. 



A Cosmarium very much like this species was found in a gathering 

 from Gliversrejn (Str.); but as I did not come across any empty cells, 

 I was not able to see the arrangement of Ihe granulation clearlj^, hence, 

 mj' determination is open to doubt. 



159. C. cyclicum Lund. ^arcticum Nordst. 



In a collection from Klaksvig (Hordd) gathered by Mr. Feddersen. 



160. C. Kirchneri Borgs. 



Long. = 57 fi; lat. — 45 fi; lat. istlim. =^ 17 |M; crass. — 33 jM. 

 Skopen (San do); Svartafoselv near Hojvig (Str.). 



The protuberances in the middle of the semicells are sometimes smaller than 

 in my figure (Desm. Bornh. tab. 6, fig. 3). 



161. C. latum Bréb. 



Long. = 108 /^; lat. — 88,m; crass. = 45 jM. 

 From mountain heights (450 m.) on Bordo. 



Tbe form from tbe Færoes is very much like Bisset's fig. 10 

 (Roy and Bisset: On Scottish Desm. p. 37, tab. 2). 



162. C. reniforme Arcli. 



Rather common. Found in gatherings from Thorshavn and Vest- 

 manhavn (Str.); Sand (Sando); Trangisvaag (Syd.) and in Plankton 

 from Sorvaagsvatn (Vaago). 



163. C. Kjellmani Wille *grande Wille. 



Mentioned by Wille (1. c. p. 27), but with some reservation. 



164. C. Botrytis (Bory) Menegh. 



This species, first found by Rostrup (Fær. Fl. p. 90) is very 

 common in the Færoes. Resides the typical form several others 



15* 



