BULB OCH AETE 31 
Oogonia considerably larger and broadly ellipsoid; vegetative cells 
14-19 14-194; oogonia 28-34X39-45u; oospores 26-3237-42u; 
antheridia 8-10 X5-8u. 
Germany. 
B. nana and B. monile, as far as specific dimensions are 
concerned, are quite similar plants. If one has a mature plant 
of the former, however, he will find vegetative cells longer than 
their width, and this is almost never the case in the latter. 
The variety robusta is easily separated by its longer oogonia. 
3. B. megastoma Wittrock and Lundell. 
(Pl. IX, fig. 76.) 
In Wittrock 1874, p. 51, Pl. 1, fig. 21; Hirn 1900, p. 354, Pl. LIX, fig. 370; 
Heering 1914, p. 231, fig. 353; Tiffany 1928, p. 1383, Pl. XXII, fig. 76. 
Monoecious; oogonia ellipsoid to subcylindric ellipsoid, patent 
(rarely erect), below terminal setae or vegetative cells, with large 
mouth-like pore; outer oospore wall longitudinally ribbed; antheridia 
1-2, erect (rarely patent), scattered or subepigynous; vegetative cells 
18-24 18-354; oogonia 32-36X48-54u; oospores 30-34X46-52y; 
antheridial cells 10-13 & 7—9u. 
Sweden, Denmark. 
The large mouth-like pore of the oogonium rather readily 
separates mature plants from any others of the genus. 
4. B. basispora Wittrock and Lundell. 
(Pl. IX, fig. 74.) 
In Wittrock 1874, p. 50; Hirn 1900, p. 350, Pl. LVIII, fig. 364; Heering 1914, 
p. 229, fig. 350; Tiffany 1928, p. 133, Pl. XXII, fig. 74. 
Monoecious; oogonia ellipsoid or subcylindric-ellipsoid, patent or 
erect, below vegetative cells; outer oospore wall longitudinally ribbed; 
antheridia 1-3, patent or erect, scattered or subepigynous; vegetative 
cells 15-19 15-23; oogonia 24-28 X 40—45y; oospores 22-95 X38- —43u3 
antheridia 8-11 X6—8uy. 
United States: Ohio; Sweden. 
Among the monoecious forms B. basispora bears some 
resemblance to B. debaryana and B. mirabilis, but can usually 
be distinguished by its relatively shorter vegetative cells and 
its oogonia. 
5. B. debaryana Wittrock and Lundell. 
(Pl. IX, fig. 77.) 
In Wittrock 1874, 51; Hirn 1900, 353, Pl. LIX, fig. 369; Heering 1914, 
Pe2ol, fig. oo2: Tiffany F998" job UBB} Lk ¥XIL figs dike 
Monoecious; oogonia ellipsoid, patent, below vegetative cells or 
terminal setae; outer wall of oospore longitudinally ribbed; antheridia 
