211 

 II. Chlorophyceæ. 



Conjugatæ. 

 Order VIII. DESMIDIACEÆ. 



42. Sphæpozosma vertebratum (Bréb.) Ralfs. 



Rostrup Fær. Fl. j). 91) has l'ound this species »on moss (Str.). 



43. S. pulchellum Arch. 



Mr. Lemniermann kindly tells me that he has seen this species in 

 some Plankton from Sorvaagsvatn (Yaago). 



f. minor Gay {Spondylosium tetragoniim West). 

 Long. = 8 ^ = lat. 

 Skopen S and 6). 



44. S. excavatum Ralfs. 



Gliversrejn near Thorshavn (Str.j; Klakken near Klaksvig (Bordo); 

 Skopen (S an do); also found in Plankton from Sorvaagsvatn (Vaago). 



45. Hyalotheca dissiliens (Dillw.) Bréb. 



Rather commonly dispersed; both a broad and a slender form 

 (var. major and minor Delponte) have been found. It occurred too in 

 Plankton from Sorvaagsvatn (Vaago); and Grothusvatn (San do). 



Var. bidentula Nordst. 



Midvaag (Va a g 6) ; Trangisvaag (Syd.); Skopen (Sando); Svartafoselv 

 near Thorshavn (Str.). 



46. Bambusina Brébissonii Kiitz. {Didymopriiim Borreri Ralfs.). 



Bog near Hojvig Str.); Klakken near Klaksvig (Bordo). 



47. Desmidium cylindricum Grev. [Didymopriiim Grevillei Kiitz.). 



Mentioned by Rostrup (1. c. p. 91). I found it in a gathering from 

 Svartafoselv near Thorshavn (Str.). 



48. Mesotænium micrococcum (Kiitz.) Kirchn. 



Found as a part of some green gelatinous clumps collected from 

 the bottom of a small pond near Thorshavn (Str.). 



49. M. Braunii De Bary. 



Mixed with Prasiola crispa on moist roofs in Thorshavn (Str.). 



50. M. chiamydosporum De Bary. 



In the same locality as the preceding species. 



51. Cylindrocystis Brébissonii Menegh. 

 Rather comnion in the coUections. 



52. Gonatozygon asperum (Bréb.) Cleve. G. Brébissonii De Bary. 

 Conj. p. 77, tab. 4, figs. 26—27. 



In a gathering from Skopen (.Sando). 



14* 



