THE GREEN ALGAE OF NORTH AMERICA 273 



14. B. PVC.MAEA Pringsheim, 1858, p. 74, PI. VI, fig. 10; 

 Wolle, 1887, p. ioo, PI. LXXXVIL figs. 4 and 5 ; Wittr. and 

 Nordst., Alg. Exsicc., Nos. 4, 1401 ; Hirn, 1900, p. 356, PI. 

 IvIX, fig. 372. Dioecious, nannandrous, gynandrosporous ; 

 vegetative cells short, not longer than wide ; primary filament 

 of the plant curved, short ; oogonia ellipsoid, patent, below ter- 

 minal setae or vegetative cells ; suffultory cell without dissepi- 

 ment ; androsporangia subepigynous or scattered, i-?-celled ; 

 dwarf males near oogonium, antheridium exterior, i-3-celled. 



veg. cell, 11-15 ft diam., %-i diam. long, 



oog., 22-25 M " 32-40 M ^long. 



andr. cell, 7-10 ft " 6-9 ft " 



nan. stipe, 11-12 M " 15-19^ " 



anth. cell, 7-8 /JL " 7-8 ft " 



Europe. 

 Only American authority Wolle's reference. 



15. B. VARIANS var. SUBSIMPLEX (Wittr.) Him, 1900, p. 

 357, Pis. LJX, LX, fig. 374; B. subsimptexWotte, 1887, p. 101, 

 PI. XC, fig. 5. Dioecious, nannandrous, gynandrosporous; 

 oogonia ellipsoid, erect or more rarely patent, below terminal 

 setae, androsporangia or vegetative cells ; androsporangia scat- 

 tered, epigynous or subepigynous, i-2-?-celled ; dwarf males 

 near or on oogonium ; antheridium exterior, i-3-celled. 



veg. cell, T3-i8Mdiam., i^-i^ diam. long, 



oog., 26-30 ft " 39-46 ft long, 



andr. cell, 10-14 M " 7-16 ft " 



nan. stipe, 11-14 ft " 15-24 ft " 



anth. cell, 7-8 M " 5-7 M " 



Pa. Europe, Asia, Australia, So. America. 



The type with dimensions about one-fifth tr one-fourth larger, 

 and with oogonia more generally patent, is found only in 

 Europe. B. dumosa Wood, 1872, p. 202, PI. XVIII, fig. 6, ac- 

 cording to Hirn should be included in this variety. 



16. B. RECTANGULARIS Wittrock, 1870, p. 142 ; Wolle, 

 1887, p. 102, PL XC, fig. i ; Hirn, 1900, p. 359, PI. LX, fig. 

 376; P. B.-A., No. 516. Dioecious, nannandrous, gynandro- 

 sporous; little branched, branches often very long ; vegetative 

 cells in cross section subrectangular ; oogonia ellipsoid, patent 

 or more rarely erect, below terminal setae or androsporangia, 

 more rarely vegetative cells ; androsporangia scattered or epigy- 

 nous, i-?-celled ; dwarf males near oogonium or more rarely 

 on it ; antheridium exterior, i-4-celled. 



