186 KAARE MÜNSTER STRØM. 



Family Chætophoraceæ. 

 Genus Stigeoclonium. Kiitzing 1843, (= Myxonema. Fries.) 



263. Stigeoclonium lubricum. (Dillw.) Kiitz. 



In a single sample from a spring. Temperature of water 

 5 — 6° C approximately. 



264. Stigeoclonium sp. (juv.) 



Juvenile specimens of Stigeoclonium were not unfrequent. 



Order Tribonemales. 



Family Tribonemaceæ. 



Genus Tribonema. Derbes & Solier 1856. 



265. Tribonema bombycinum. (Ag.) Derb. & Sol. 

 Rare. 



Family Ophiocytiaceæ. 

 Genus Ophiocytium. Nägeli 1849. 



266. Ophiocytium. majus. Nag. 

 Scarce. 



267. Ophiocytium parvulum. (Perty) A. Braun. 

 Common, and often in quantity. 



Order Protococcales. 



Family Volvocaceæ. 



Genus Carteria. Diesing 1868. 



268. Carteria sp. 



As the specimens were preserved I could not determine 

 them. I have, however, observed living Carteria individues as I 

 collected the material at Tuddal. 



Genus Chlamydomonas. Ehrbg. 1832. 



269. Chlamydomonas sp. 

 Not uncommon. 



