E22 THE OEDOGONIACEAE 
124a. Var. horridum Hirn. 
(Pl. XLII, fig. 422.) 
1900, p. 201, Pl. XX XIII, fig. 205; Oe. echinospermum A. Br. var. Wolle 1887, 
p. 86, Pl. 85, figs. 6-S. 
Larger with longer and more dense spines; antheridium pluri- 
cellular. 
United States: Florida. 
The species is one of the most easily recognized among the 
nannandrous forms by its echinate oospore, median pore, and 
large dimensions (as compared with Oe. hystrix, Oe. aster, and 
Oe. pungens). The variety horridum has no record other than 
that of Wolle, and its retention in the genus is open to con- 
siderable question. 
125. Oe. pungens Hirn. 
(Pl. XLIV, figs. 423 and 424.) 
1900, p. 199, Pl. XXXII, fig. 203. j R 
Dioecious, nannandrous, gynandrosporous; oogonium 1, _ sub- 
depressed-globose (or nearly subglobose), pore median or a little above 
median; oospore subglobose, almost filling oogonium, outer spore wall 
echinate; androsporangium |—?, hypogynous; dwarf male a little curved, 
on suffultory cell, antheridium exterior, 1-2; vegetative cell 12-16 
50-94u; oogonium 40-48 & 40—50u; oospore (with spines) 37-44 X 35—48y; 
androsporangium 14-1610-15u; dwarf male stipe 9-12 20-80n; 
antheridium 6-7 X 8—12u. 
United States: South Carolina, Illinois. 
Cf. Oe. aster (No. 121). 
126. Oe. exospirale Tiffany. 
(Pl. XLIV, figs. 425 and 426.) 
1924, p. 184, Pl. II, figs. 1-8; 1926, p. 102, Pl. IX, figs. 100-102. 
Dioecious, nannandrous, idioandrosporous; oogonium 1 (rarely 2), 
subglobose or obovoid-globose (rarely subhexagonal), pore median; 
oospore globose or subglobose, nearly filling the oogonium, spore wall 
of two layers: outer layer marked by 5-8 spiral ribs uniting at the poles, 
the polar axis always placed in a transverse position, never parallel 
with the filament, the inner layer smooth; suffultory cell swollen; 
androsporangium 1-6; basal cell elongate; dwarf male a little curved, 
situated on the suffultory cell, with exterior antheridium 1—3; vegetative 
cell 8-1260-88u; suffultory cell 16-2860-88u; oogonium 40-44 
44-484; oospore 32-38X38-40u; androsporangium 12-16 14-20p; 
dwarf male stipe 14-16 X30-40y; antheridium 8-12 X 14-16n. 
United States: Iowa, Ohio, Mississippi. ° 
This species should be compared with Oe. spirale (No. 128) 
and Oe. illinoisense (No. 127). It differs from the former in 
having smaller oogonia and oospores and in its tumid suffultory 
