THE GREEN ALGAE OF NORTH AMERICA 261 



fig. 267 ; with longer dwarf males, 60-75 p., and slightly longer 

 oospores ; otherwise like the type. 

 Mexico. 



Forma AMERICANUM Wolle, 1887, p. 77, PI. LXXXI, figs. 

 20-22 ; Hirn, 1900, p. 256. More slender than the type, with 

 shorter vegetative cells, and dwarf males on the oogonium, not 

 on the sufftiltory cell. 



veg. cell, 17-21 Aidiam., i/-j cliam. long. 



oog., 45-50 /j. " 55-63 M long. 



oos., 39-40 M " 44-46 /j. " 



nan. cell, 12-15 /" " 5<>54 M " 



Pa. 



The long, goblet- like dwarf males are characteristic of this 

 species, and have given it its specific name. The interior 

 antheridium is often hard to distinguish, and the species was at 

 first described as having unicellular antheridia. The dwarf 

 males, with the much swollen suffultoty cells, and the irregular 

 lines on the oospore, make a combination of characters that 

 clearly distinguishes the species, and this combination is found 

 in all the forms and varieties. 



ANTHERIDIUM INTERIUS, OPERCULATA. 



64. .OE. TNDULATUM (Breb.) A. Braun in De Bary, 1854., p. 

 94; Wolle, 1887, p. 76, PI. LXXVII, fig. 8; Hirn, 1900, 

 p. 257, PI. XLV, fig. 273; Wittr. and Nordst., Alg. Exsicc., 

 No. 702, in part. Dioecious, nannandrous, gynandrosporous or 

 idioandrosporous ; oogonia single or 2, subglobose or ellipsoid- 

 globose, operculate, division inferior, oospore globose or sub- 

 globose, almost filling the oogonium, membrane smooth, gener- 

 ally thick ; suffultory cell not or only slightly swollen ; andro- 

 sporangia to 7-celled ; vegetative cells four times undulate- 

 constricted ; basal cell elongate, not undulate ; terminal cell, 

 which sometimes is an oogonium, obtuse ; dwarf males elongate- 

 obconic, generally on the suffultory cell, more rarely on other 

 vegetative cells near the oogonium ; antheridium interior. 



veg. cell, 12-22 /x diaui., 3-5 diam. long. 



oog., 48-56 M " 50-75 M long. 



oos., 42-50 M " 42-52 M " 



andr. cell, 15-21 n " 7-14 n " 



nan. cell, S-io M " 48-65 /j. " 



Europe, Australia, So. America. 



Reported by Wolle, but the only definite American locality 

 recorded is Martha's Vineyard, Mass., and the plant there is 



