132 THE OFDOGCONTACEAE 
144a. Var. condensatum (Hallas) Hirn. 
(Pl. XLVI, figs. 448 and 449.) 
1906, p. 17, Pl. III, fig. 15; Oe. condensatum Hallas 1905, p. 400, fig. 4. 
Idioandrosporous; oogonium rarely in two’s; oospore depressed- 
globose; androsporangium 1-13; vegetative cell 14-18X20-80,; 
oogonium 35-46 28-38; oospore 32-44 25-36u; androsporangium 
12-14X7-21yu; dwarf male stipe 11-13X21-24y; antheridium 9-10 
7-12u. 
United States: Michigan; Denmark. 
The species is characterized by erect dwarf males, globose 
oospores, and smooth spore walls. It is larger than Oe. multi- 
sporum (No. 143) and there is little tendency toward a cluster 
of dwarf males. The var. condensatum has depressed-globose 
oospores and the dwarf males sometimes appear more or less 
in clusters. In superficial appearance there is considerable 
resemblance between Oe. multisporum var. magnum (No. 148a) 
and Oe. irregulare var. condensatum. 
145. Oe. donneilii Wolle; Hirn. 
(Pl. XLV, fig. 437.) 
Wolle 1880, p. 48; Wolle 1887, p. 85, Pl. 84, figs. 3-6; Hirn 1900, p. 206, Pl. 
NOOO He aul 
Dioecious, nannandrous, idioandrosporous; oogonium 1 (rarely 2), 
obovoid-globose, pore superior; oospore globose, not filling oogonium, 
outer layer of spore wall echinate, spirals 5-7, anastomosate; andro- 
sporangium 4-10; dwarf male a little curved, on suffultory cell or rarely 
on oogonium, antheridium exterior, 1-2—?; vegetative cell 41-59x 
54-175; oogonium 63-78 X 70-93; oospore (with spines) 60-70 X 60-70y; 
androsporangium 40-45 10-124; dwarf male stipe 16-21X63-74u; 
antheridium 14-15 x 8-22u. 
United States: Florida. 
145a. Var. wittrockianum Hirn. 
(Pl. XLV, figs. 438 and 439.) 
1909, p. 207, Pl. XXXIV, fig. 212; Oe. wittrockianum Hirn 1896 in Wittr., 
Nordst, and Lagerh. Alg. Exs. No. 1251. 
Smaller; spines a little smaller; vegetative cell (82—)35-45 X 70-135; 
oogonium 63-73 68-754; oospore (with spines) 55-6656-68y; 
androsporangium 30-38X 11-264; dwarf male stipe 11-15 50-65; 
antheridium 9-10 20-23. 
Brazil, Paraguay. 
The species is characterized by the echinate oospore wall, 
the spines being arranged spirally. The variety wittrockianum 
is very similar to the type, having slightly more slender fila- 
ments and smaller spines. 
