THE GREEN ALGAE OF NORTH AMERICA 253 



51. OE. DONNELLII Wolle, 1880, p. 48; 1887, p. 85, PI. 

 LXXXIV, figs. 3-6; Him, 1900, p. 206, PI. XXXIV, fig. 211. 

 Dioecious, naunandrous, idioandrosporous ; oogonia single, 

 rarely double, slightly swollen, oboviform-globose, pore supe- 

 rior ; oospore globose, not fully filling the oogonium ; epispore 

 with conical spines, arranged in 5-7 occasionally anastomosing 

 spirals ; suffultory cell not swollen ; androsporangia 4-io-celled ; 

 dwarf males slightly curved, on the suffultory cell, rarely on the 

 oogonium ; antheridium exterior, i-2-celled. 



veg. cell, 41-59 M diam., J/i'3 diain. long. 



oog., 63-78 fj. " 70-93 /u long. 



oos., 60-70/01 " 60-70 M " 



andr. cell, 40-45 yu. " 10-12 M " 



nan. stipe, 16-21 M " 63-74 ^ ' 



anth. cell, 14-15 M " 8-22 /u " 



Florida. 



Hirn's examination of authentic specimens enabled him to 

 correct and complete the descriptions and figures of Wolle. 



52. OE. HUNTII Wood, 1869, p. 333 ; 1872, p. 198, PI. 

 XVII, fig. 2; Wolle, 1887, p. 85, PI. LXXXIV, fig. 9; Him, 

 1900, p. 208, PL XXXIV, fig. 213; P. B.-A.,No. 1471. Dioe- 

 cious, nannandrous ; oogonia single, subglobose or subobovi- 

 form-globose, pore inferior ; oospore globose, not filling the 

 oogonium, epispore with four raised spiral lines ; suffultory cell 

 similar to other vegetative cells ; basal cell elongate, terminal 

 cell tapering, produced into a long hyaline seta ; dwarf males 

 nearly straight, on the suffultory cells ; antheridium exterior, i- 

 (or 2-?) celled. 



veg. cell, 15-25 M diam., 2^-3^ diam. long. 



oog., 50-60 M " 5 2 -6o /"long. 



oos., 38-42 M " 38-42 /i ' 



nan. stipe, n M " 5 2 M ' 



anth. cell, 10 M " 3 f* ' 



Mass., Pa. 



Wood's record was long the only one for this species, which 

 he found growing in his aquarium. Wolle merely condenses 

 Wood's description, and Him copies it, and gives dimensions 

 taken from Wood's figures. Its nearest relative seems to be Oe. 

 spirale from Java, but in the latter the arrangement of the 

 spirals is quite different. For occurrence in Mass., see Collins, 

 igoSb, p. 57. 



53. OE. SEXANGULARE Cleve in Wittrock, 1870, p. 131 ; 

 Wolle, 1887, p. 82, PI. LXXIX, figs. 8 and 9 ; Him, 1900, p. 



