190 KAARE MÜNSTER STRØM. 



Family Characieæ. 

 Genus Characiopsis. Borzi 1895. 



294. Characiopsis crassi-apex. Printz: Ghristianiatraktens 

 protococcoideer. Pl. iii. Figs. 76 — 83. 



This interesting species occurred in abundance in a sample, 

 the specimens being epiphytes on Microspora. 

 Figs. 9-12, PI. III. 



Family Hydrodictyaceæ. 

 Genus Pediastrtim,. Mey en 1829. 



295. Pediastrum incisum. Hass. 

 Nitardy; Synonymic. Taf. v, vii & viii. 

 In two samples. 



Addenda : 



296. Cosmarium connatum. Breb. 

 In a single sample. 



297. Staurastrutn megalonothum. Nordst. 

 This arctic species occurred in a single sample. 



298. Staurastrum tetracerum. Ralfs. 

 ISot unfrequent. 



299. Coleochœte pulvinata. A. Braun. 

 On Potamogeton in the Kovstulvatn lake. 



300. Adinastrum Hantzschii. Lagerh. 

 Rare, at a single locality. 



V. Summary and Conclusions. 



The alga-flora of the district surveyed proved to be some- 

 what rich, the total number of species being about 300, exclusive 

 of diatoms. — If the algae were collected in the autumn, and if 

 the myxophyceæ especially were more systematically investi- 

 gated, I should think that the total number of species should 



