FRESHWATER ALGÆ FROM TUDDAL LN TELEMARK. 185 



Order Ulothrichales. 

 Family Ulothrichaceæ. 

 Genus Geminella. Turpin em. Lagerheim 1883. 



254. Geminella mutabilis. (Breb.) Wille. 

 Rare, in a single sample. 



Genus Ulothrix. Kiitzing. 1843. 



255. Ulothrix variabilis. Kiitz. 



Not uncommon. Up to 4100 leet. Size: lat. fil. 5 — 6 ^. 



256. Ulothrix zonata. (Web. & Mohr.) Kütz. 

 Scmevvhat scarce. 



257. Ulothrix nionoliformis. Külz. 

 Borge: Siissvv. alg. fl. Spitzbergen. Fig. 17. 



General, but scarce, ln JNorway this species is not uncom- 

 mon in peaty districts. 



Genus Binuclearia. Wittr. 1886. 



258. Binuclearia tatrana. Wittr. 

 Somewhat rare. 



Family Microsporaceæ. 

 Genus Microspora. Thur. em. Lagerheim 1888. 



259. Microspora tumidula. Hazen : Ulothrich. U. S. 

 Rather common. Up to 4100 feet. Size: lat. fil. 7,5 & 



8-9 /.I. 



260. Microspora stagnorum. (Kütz.) Lagerh. 

 Not uncommon. 



26 L Microspora Willeana. Lagerh. 

 In a single samole. Size: lat. fil. 12,5 /n. 

 262. Microspora pachyderma. (Wille). Lagerh. 

 In a single sample. Size: lat. fil. 10 — 12 /r 



