10 Veit Bbecher Wittrock, 



11. Oe. Zig-zag Clev. 

 in Wittr. Dispos. Oed. Saec p. 120. 

 Oe. oogoniis singulis, globosis, poro superiore apertis; oosporis 

 oogonia complentibus; spermogoniis unicellularibus; oogoniis spermogoniisque 

 atque cellulis vegetativis alternis; 



crassit. cell, veget. 17 — 18 ^, altit. 2 — 4plo major; 

 „ oogon. 50 — 51 ,, ,, 53 — 54 ^; 



,, oospor. 47 — 48 „ „ 49 — 50 ,, ; 



,, cell, spermog. 17 „ „ 10 — 11 „. 

 Hab. in Suecia. 



12. Oe. Pyrulum Wittr. 



Oedog. nov. p. 2. 



Oe. oogoniis singulis, globose -pyrilbrmibus, operculo apertis, rima 

 angusta; oosporis globosis, oogonia non plane complentibus; spermogoniis 

 unicellularibus, epigynis vel hypogynis vel rarius subepigynis; cellula ter- 

 minali apice brevi-acuta, ceterum eadem forma ac cellulis vegetativis 

 trivialibus; 



crassit. cell, veget. 8 — 11 altit. 3 1 /, — 7plo major; 



„ oogon. 30—33 ., ., 31—34 



oospor. 20—29 ., „ 27—28 „ ; 



,, cell, spermog. 8 — 9 ,, „ 10—11 ,, . 

 Hab. in Suecia, Norvegia. 



13. Oe. vernale (Hass.) Wittr. 



(i)Vesiculifera vernalis Hass. Descr. on. Freshw. Conf. p. 434. (?) Vesiculifera 

 Candollii Hass. Hist, of Brit. Freshw. Alg. p. 208, t. 52, f. — Non Oe. vernale 

 Wittr. Oedog. nov. p. i. 



Oe. oogoniis singulis, oboviformi-globosis. operculo apertis, rima 

 angusta; oosporis globosis, oogonia non plane complentibus; spermogoniis 

 2cellularibus, subepigynis ; 



crassit. cell, veget. 10 — 1G /u,, altit. 4 7 2 — tiplo major; 

 ,, oogon. 39 — 45 „ ,, 45 — 51 ytt; 



,, oospor. .'54 — 38 ,, ,, 34 — 39 



cell, spermog. 10 — 12 ,, ,, 8 — 9 

 Hab. in Suecia. 



11 7 



'1 • 



14. Oe. crispum (Hass) Wittr. 

 Vesiculifera crispa Hass. Hist, of Brit. Freshw. Alg. p. 203, tab. 52, f. 8 '). 



') Vidimus speciniina originalia Hassalliana e herhario cel. Professoris J. 

 E Areschoug. 



