THE GREEN ALGAE OF NORTH AMERICA 243 



Var. AEQUATORIALE forma HORTENSE Wittrock in Wittr. 

 and Nordst., Alg. Exsicc., No. 1017; Him, 1900, p. 145, PI. 

 XXI, fig. 109. Smaller than the type in all parts, oosporesless 

 completely filling the oogonium, sometimes globose-ellipsoid, 

 and then not nearly filling the oogonium. 



veg. cell, female, 24-33 Mdiatn., 2-4^ diam. long, 



oog., 42-51 fj. " 63-88 /"long, 



oos., 38-49 M " 48-72 M " 



These measures are for forma hortcnsc ; in the variety the 

 vegetative cells and oogouia are proportionately longer. Green- 

 land. Ecuador. 



31. OE. MEXICANUM Wittrock, 1878, p. 138; Him, 1900, 

 p. 147, PI. XXII, fig. in; Tilden, Amer. Algae, No. 257. 

 Dioecious; oogonia single, slightly swollen, cylindric-obovi- 

 form, pore superior ; oospore of the same form as the oogo- 

 nium, filling or nearly filling it, membrane smooth ; male plant 

 a little more slender than the female ; antheridia to 8-celled ; 

 spermatozoids binate, division vertical. 



veg. cell, female, 34-41 Mdiam., i&-3> diam. long, 

 veg. cell, male, 30-38 M " 2-3 



oog., 53-63 M " 76-110 M long, 



oos., 51-60 M " 63-80 M " 



anth. cell, 28-35 M " 7-17 /* " 



Mass., So. Dakota, Mexico. 



Nearly related to Oe, grande, but with vegetative cells aver- 

 aging larger and considerably shorter, oogouia more nearly 

 cylindrical, and more completely filled by the oospore. 



MACRANDRIA, OPERCULATA, GLOBOSPORA. 



32. OE. PUNCTATO-STRIATUM De Bary, 1854, p. 47, PI. II, 

 figs. 15 and 16; Wolle, 1887, p. 91, PI. LXXXV, figs. 3-5 ; 

 Him, 1900, p. 152, PI. XXIII, fig. 123; Rabenhorst, Algen, 

 Nos. 214, 2276. Diocecious; oogonia single, depressed-globose, 

 operculate, division median ; oospore depressed-globose, not 

 quite filling the oogonium, membrane smooth ; male plant 

 slightly more slender than the female ; antheridia to lo-celled, 

 cells slightly swollen ; spermatozoid single ; membrane of the 

 vegetative cells and oogonia marked with spirally placed dot- 

 like pores ; basal cell depressed-globose or subhemispherical, 

 not elongate, membrane vertically plicate. 



