BULB OCH AETE 37 
14a. Form picta Hirn. 
1900, p. 337. 
Of smaller dimensions; vegetative cells 13-16X19-40u; oogonia 
33-38 X 31-37. 
Brazil. 
15. B. borealis Wittrock. 
(Pl. Il, fig. 10.) 
1870, p. 138; 1874, p. 46; Hirn 1900, p. 324, Pl. LI, fig. 331; Heering 1914, p. 233, 
fig. 357; Tiffany 1928, p. 1389, Pl. XV, fig. 10. 
Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- 
globose, patent, below vegetative cells, wall thick; division of suffultory 
cell superior (occasionally nearly supreme); outer oospore wall scrobicu- 
late or sometimes nearly smooth; androsporangia 1-3, subepigynous, 
patent: dwarf males on oogonia, antheridia interior, stipe a little curved, 
shorter than antheridia; vegetative cells 16—-21X20-42u; oogonia 
40-48 X 35—40u; oospores 38-46 X 33-38; androsporangia 12-13 *8—-9y; 
dwarf males 9-10 X18—21y. 
Norway, Sweden, Finland. 
16. B. nordstedtii Wittrock. 
(Pl. II, fig. 17.) 
1874, p. 44; Hirn 1900, p. 332, Pl. LIII, fig. 339; Collins 1909, p. 269; Heering 
1914, p. 234, fig. 361; West 1916, p. 396, fig. 251B; Tiffany 1928, p. 139, Pl. XV, 
homldae) barALe NOt 
Dioecious, nannandrous, gynandrosporous; oogonia depressed- 
globose or subquadrangularly so, patent, below androsporangia or 
rarely terminal setae; division of suffultory cell superior (occasionally 
submedian); oospore wall finely scrobiculate or nearly smooth; andro- 
sporangia unicellular, epigynous; dwarf males on oogonia, stipe slightly 
curved, shorter than antheridia; vegetative cells 14-18X28-85uy; 
oogonia 36-43X29-36u; oospores 34-4127-34u; androsporangia 
10-12 X9-12u; dwarf males 9-19 X 23-25un. 
United States: Ohio, Illinois, Connecticut, Alaska; Green- 
land, Australia, Finland, Germany, Spain, Sweden, Austria, 
Ireland. 
16a. Form suberecta Collins. 
(PI. If, fig. 18.) 
1912, p. 88; Tiffany 1928, p. 189, Pl. XV, fig. 18. 
Smaller; oogonia 28-32 34-38u, depressed-globose, often erect. 
United States: Massachusetts. 
The suberect habit of this form appears to be very incon- 
stant, but the smaller dimensions warrant a separate form. 
16b. Var. minor Woronichin. 
1923, p. 99. 
Vegetative cells 10-1220-25u; oospores about 36X33yu; dwarf 
males 8-10 19-20. 
Tiflis (Caucasus). 
