FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 195 



Fig. 8. Cosmarium Tuddalense. sp. nov. (585 x.) 



Figs. 9 & 10. Glosterium Ulna. Focke. var. constridmn. var nov. 10. apex 



of semicell. (9. 400 x., 10. 790 x.) 

 Fig. 11. Cosmarium subardoum. (Lagerh.) Racib. (790 x.) 

 Fig. 12. Cosmarium quadratum. Ralfs. (790 x.) 

 Fig. 13. Peniuni Cylindrus. (Ehibg.) Breb. (790 x.) 

 Fig. 14. Cosmarium, venustutn. (Breb.) Arch, fortna minor. Wille. 



(1075 x.) 

 Figs. 15 og 16. Docidium undulatum. Bail. (15. 670 x., 16. 1075 x.) 



P 1 a t e V. 



Fig. 1. Euastrum sinuosum. Lenorm. var. redudum. W & G. S. West. 



(525 x. approx.) 

 Fig. 2. Stigonema Germination of spores? (325 x. approx.) 

 Fig. 3. Chroococcus macrococcus. Kütz.) Rabb. (525 x. approx.) 

 Fig. 4. Arthrodesmus Incus. (Breb.) Hass. forma perforata. Schmidle. 



(525 x. approx.) 

 Figs. 5 & 6. Euastrum Didelta. (Turp.) Ralfs, forma. (535 x. approx.) 

 Fig. 7. Boya obtusa. (Breb.) W. & G. S. West. var. montana. W. & G, S. 



West. (720 x. approx.) 

 Fig. 8. Oocystis solitaria. Wittr. forina. (720 x. approx.) 

 Fig. 9. Micrasterias denticulata. Breb. forma. (325 x. approx.) 

 Fig. 10. Peridinium cindtim. Ehrbg. (Half-schematic.) (1245 approx.) 



All the magnifications are only approximate, as the plate was 



reduced in size by reproduction. 



