32 Vink (O18 DiOGOIN EMG E AE 
1—?, patent or seldom erect, subepigynous or scattered; vegetative 
cells 18-22 23-44u; oogonia 27-33 X43-50u; oospores 25-30 X 40-48u; 
antheridia 10-12 * 8—9u. 
Sweden, Latvia, Canada. 
6. B. mirabilis Wittrock. 
(Pl. IX, fig. 69.) 
1870, p. 137, Pl. 1, figs. 8 and 9; 1874, p. 50; B. sp. Reinsch 1875, p. 81; 
B. mirabilis Wittr. var. lapponica Wittr. and Lund. im Wittrock 1874, p. 51; Hirn 
1900, p. 351, Pl. LVITI, fig. 365; Hirn 1906, p. 57; Collins 1909, p. 272; Heering 1914, 
p. 229, fig. 351; Tiffany 1928, p. 1384, Pl. XXII, fig. 69; P. B. A. No. 1481. 
Monoecious; oogonia cylindric-ellipsoid to suboblong-ellipsoid, 
patent (rarely erect), below terminal setae or vegetative cells; outer 
wall of oospore longitudinally ribbed; antheridia 1-4, erect or patent, 
subepigynous or scattered; vegetative cells 15-2020-40u; oogonia 
26-33 X 46-58; oospores 25-31 XK 44-56u; antheridia 9-12 X6—9n. 
United States: New Jersey, Michigan, Illinois, Minnesota; 
Greenland, Africa, Europe, Australia, Siberia, Mongolia. 
6a. Form immersa (Wittrock) Hirn. 
(Pl. IX, fig. 70.) 
1900, p. 352, Pl. LVIII, fig. 867; B. mirabilis Wittr. var. immersa Wittr. 1874) 
p. 51; Heering 1914, p. 230; Tiffany 1928, p. 134, Pl. XXII, fig. 70. 
Vegetative cells 13-17X16-30u; oogonia 25-33 X40—-48u; oospores 
23-30 X 38-46u; antheridia 7-11 6-8. 
Norway, Germany. 
6b. Var. gracilis (Pringsheim) Hirn. 
(Pl. IX, fig. 71.) 
1900, p. 353, Pl. LIX, fig. 368; B. gracilis Pringsh. 1858, p. 74; Wittrock 1874, 
p. 57; Heering 1914, p. 230; Tiffany 1928, p. 134, Pl. XXII, fig. 71. 
Vegetative cells 13-16 17-32u; oogonia 20-28 X47—-55yu; oospores 
18-26 X 45-53u; antheridia 8-11 6-8uy. 
Germany, Sweden, Denmark. 
7. B. elatior Pringsheim. 
(Pl. I, fig. 1.) 
1858, p. 73, Pl. 6, fig. 5; Wittrock 1874, p. 49; Hirn 1900, p. 321, Pl. LI, fig. 327; 
Hirn 1906, p. 56; Heering 1914, p. 231, fig. 355; Tiffany 1928, p. 134, Pl. XIV, fig. 1. 
Dioecious, nannandrous, gynandrosporous; oogonia depressed 
globose to depressed subquadrangular-globose, erect or seldom patent, 
below androsporangia; division of suffultory cell basal; oospore smooth; 
androsporangia epigynous or rarely scattered, 1-2; dwarf males usually 
on suffultory cells, antheridia exterior, unicellular, stipe scarcely longer 
than the antheridia; vegetative cells 13-18 20-63; oogonia 34-44 
X31-38u; oospores 32-4229-36u; androsporangia 10-13X8-11y; 
dwarf male stipe 8-10 X 18-35y; antheridia 6-8 X 9-1 1p. 
United States: Massachusetts; India, Ceylon, Austria, Aus- 
tralia, Germany, Sweden, New Caledonia. 
