‘ 
OEDOGONIUM 131 
figure does not help much and his confusing statements regard- 
ing an interior and a unicellular antheridium probably mean 
that he did not attach much significance to this character. 
The Ohio material with short vegetative cells seemed close to 
Oe. crassiusculum in other characteristics. I have therefore 
placed Wolle’s species as a variety of crassiusculum, with an 
emended description based on the Ohio specimens. 
143. Oe. multisporum Wood. 
(Pl. XLVI, figs. 450 and 451.) 
1869, p. 141; Androgynia multispora Wood 1872, p. 196, Pl. 17, fig. 3; Hirn 1900, 
p. 232, Pl. XXXIX, fig. 239; Collins 1909, p. 257; Fritsch and Rich 1913, p. 76, 
Age oA PB. A. No, 1784. 
Dioecious, nannandrous; oogonium 1-3, subovoid or subglobose, 
pore superior; oospore globose, nearly filling oogonium, spore wall 
smooth; dwarf male a little curved or nearly erect, near or on oogonium, 
antheridium exterior, 1-4; vegetative cell 10-15 10-30u; oogonium 
24-35 X 27-334; oospore 27-380 24-30u; dwarf male stipe 10-11 
26-30u; antheridium 7-9 X 7-9u. 
United States: Pennsylvania, Illinois; England. 
148a. Var. magnum Ackley. 
(Pl. XLVI, fig. 452.) 
1929, p. 305, Pl. XXXVI, figs. 20-22. 
Larger than the species; idioandrosporous; oogonium 1, subglobose, 
pore supramedian (rarely median); androsporangium 1-2; dwarf male 
on or near oogonium or scattered; vegetative cell 14-18 30—-90n; 
suffultory cell 17-21X28-90u; oogonium 40-43X33-38u; oospore 
38-41 32-36; androsporangium 17-18 X16—22u; dwarf male stipe 
12-14 (—20) X 24-26 (—29)u; antheridium 8-10 (—12) X8-10u. 
United States: Michigan (Muskegon Lake). 
It is sometimes difficult to decipher the pore in the species 
proper. The plant is usually irregularly formed with numerous 
and often scattered dwarf males and frequently gives the 
appearance of not being mature. The variety is larger. 
144. Oc. irregulare Wittrock. 
(Pl. XLVI, fig. 447.) 
1870, p. 128; 1874, p. 22; Hirn 1900, p. 202, Pl. XX XIII, fig. 207. 
Dioecious, nannandrous; oogonium 1, globose or rarely subdepressed- 
globose, pore superior; oospore globose, completing oogonium, spore 
wall smooth; dwarf male erect, on or near oogonium, antheridium 
exterior, 1-4; vegetative cell 15-20 40-80u; oogonium 37-45 X 3647p; 
oospore 36-42 3441y; dwarf male stipe 12-15 X 20-24y; antheridium 
10-12 X6-8uy. 
United States: Illinois, Ohio, Florida, Michigan; British 
Columbia; Denmark, Sweden. 
