FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 181 



215. Staurastrum, cyrtocermn. Breb. 

 General, but scarce. 



216. Staurastrum pilosum. (Näg.) Arch. 

 Rather scarce. 



217. Staurastrum, m^uricatuni. Breb. 

 General, but scarce. 



218. Staurastrum polytrichum. Perty. 

 Rare. 



219. Staurastrum saxonicum. Bulnh. 

 Rare, but in quantity in a single sample. 



220. Staurastrum echinatum. Breb. 

 Very rare. 



221. Staurastrum teliferum. Ralfs. 

 General, and sonnetimes in abundance. 



222. Staurastrum hirsutum. (Ehrbg.) Breb. 

 General, but scarce. 



223. Staurastrum sexcostatum. Breb. 

 In a single sample. 



224. Staurastrum scahrum. Breb. 

 Wittr. & Nordst. Exsicc. 1144. 



This rare species occurred in one or two samples. 



225. Staurastrum hrachiatum. Ralfs. 

 G. S. West: Variation Desmid. Pl. 11. 



General, but never in abundance. I can not understand that 

 neither Printz nor Wille record this common species. (Printz: 

 Chloroph. Norwegen. Wille: Algol. Notiz. VII.) Nordstedt (Sydl. 

 Norges Desmid.) records it from several localities. 



226. Staurastrum polymorphum. Breb. 

 General, but not very abundant. 



227. Staurastrum margaritaceum. (Ehrbg.) Menegh. 

 General, and abundant. 



228. Staurastrum, aculeatum. (Ehrbg.) Menegh. 

 Rare. 



