212 



53. G. Ralfsii De Bary. 

 L. c, tab. 4, fig. 24— 25. 



Found here and therc. Also in Plankton from Sorvaagsvatn (Vaago). 



54. Penium margaritaceum (Ehrenb.) Bréb. 



Seems to be common; found in gatherings from Klakken near 

 Klaksvig (Bor do); Kirkebokamp (Str.); Midvaag (Vaago) (in the latter 

 place with spores like those in Ralfs's figure, Brit. Desm, tab. 33, fig. 3); 

 Viderejde (Vid.); Grothusvatn (Sand 6); Trangisvaag (Syd.). 



55. P. Cylindrus (Ehrenb.) Bréb. 



Klakken near Klaksvig (Bordo); Midvaag (Vaago); Viderejde (Vid.); 

 Trangisvaag (Syd.); Grothusvatn (S an do). 



56. P. DIgitus (Ehrenb.) Bréb. 



Mentioned by Rostrup (Fær. Fl. p. 90) and afterwards found by 

 Wille (1. c. p. 28); it seems to be common, as it often appeared in the 

 material I had for examination. 



57. P. lamellosum Bréb. 

 Mentioned by Rostrup (Fær. Fl. p. 90). 



58. P. oblongum De Barv. 

 Conjugaten tab. 7, fig. G. 



Lat. = 26 |U. . 



Thorshavn (Str.). 



59. P. closterioides Ralfs. 



Hojvig (Str.); Sand (San do); Trangisvaag (Syd.). 



60. P. Navicula Bréb. 

 Lat. = 14: fl. 



At the foot of Skjællingfjæld (Str.). 



61. P. crassiusculum De Bary. 



The specimens from the Færoes are very much hke the Bra- 



zilian form figured by me in Desm. Brasil. pp. 931 — 32, tab. 2, fig. 1. 



Long. = 80/i; lat. = 22— 35 ^u. 



Found near Trangisvaag at a height of 200 m. (Syd.); at Kirkebo- 

 kamp (Str.). 



62. Pleurotænium Ehrenbergii (Ralfs). Docidiiim Ehrenbergii Ralfs. 

 The specimens from the Færoes are often just hke the figures 



given by Ralfs (Brit. Desm. tab. 26, fig. 4); .forms, however, are 



sometimes found with semicells somewhat swoUen at the base and 



bearing a close resemblance to Pleurotænium maximum (Reinsch) Lund. 



Judging from its numerous habitats this species appears to be common. 



