216 Kanr E. Hırn. 
Tab. XXXV, Fig. 220. 
Hab. in 
America bor.: in lacu Seatterwood Lake civit. South Dakota (Herb. Tilden); 
Bush Lake, Eden Prairie, Hennepin County, Minnesota (l. c.); Beaver Brook, Mas- 
sachusetts (Herb. Collins); Norwich, Connecticut (1. c.); Pennsylvania, New Jersey, 
Minnesota (sec. Wolle) Britannia: Cambridgeshire Anglie (Herb. West). Dania: 
in stagno prope Fredriksdal insule Seeland. Gallia: ad oppidum Falaise prov. 
Normandie (Herb. Bruxell) Suecia: Sc. ad oppidum Kristianstad; Upl. in lacu 
Byrsjón par. Funbo. 
Forma in Phycoth. Bor.-Amer. Fasc. II, N:o 72 a et b oogonia interdum 
habet ad 4-seriata, oosporas haud raro magis globosas quam in forma typica; 
crassit. cell. veget. 29— 37 u, altit. 2/—4'/,-plo major; 
» oogon. 46—63 ,, , 46—74 u; 
3 00Spor. AA GIE Se 44—62 ,; 
” 
5 cell. androsp. 20—27 
à stip. nannandr. 13—14 
= cell. antherid. 8—9 
»? » 1913 
»? » 63—69 
»? » 12—16 
9» 
2 
Tab. XXXV, Fig. 221. 
Hab. in 
America bor.: in stagno ad oppidum Malden civit. Massachusetts nec non ad 
Kittery civit. Maine. 
y Arechavaletæ (Wirrr.) Hırn. 
Exs. Oe. Arechavaletæ Wittrock 1886 in Wittr. et Nordst. Alg. exs. Fasc. 
15, N:o 706 (Fasc. 21 p. 7). 
1889 De Toni (I) p. 55 sub nom. Oe. Arechavalete Wittr. 
Var. (?idioandrospora), forma oogoniorum et oosporarum form: superiori 
proxima, differt stipite nannandrium breviore, antheridio 1—2-cellulari, oogoniis 
oosporisque plerumque paullo brevioribus, illis singulis, magnitudine paullo minore; 
crassit. cell. veget. 21—29 u, altit. 1'/4—4-plo major; 
» oogon. 39—54 ,, , 42—65 u; 
5 00Spor. 37—52 ,, , 40—57 ,; 
= stip. nannandr. 14—16 ,, , 40—57 ,; 
» cell. antherid. 9—14 ,, , 10—16 ,. 
T. XXVII. 
