OEDOGONIUM £23 
cells; it is separated from the latter on the basis of smaller 
dimensions. 
127. Oc. illinoisense Transeau. 
(Pl. XLIV, figs. 431-433. ) 
- 1914, p. 299, Pl. XXIX, figs. 6-8. 
Dioecious, nannandrous, gynandrosporous; oogonium 1, sub- 
. globose to obovoid-globose, pore median; oospore globose or subglobose, 
nearly filling oogonium, outer spore wall with 4-7 spiral ribs, uniting 
at poles, polar axis always transverse to axis of filament; suffultory 
‘cell enlarged; androsporangium 1-5; basal cell elongate; dwarf male 
slightly curved, on suffultory cell; antheridium exterior, 1-4; vegetative 
cell 13-18 X80-140u; suffultory cell 32-40 50-80u; oogonium 51-60 
60-70u; oospore 45-56X48-664; androsporangium 13-17 17—-22u; 
dwarf male stipe 14-17 37—57y; antheridium 9-12 15—-238u. 
United States: Illinois, Mississippi, Kentucky. 
Cf. Oe. exospirale, above. 
128. Oe. spirale Hirn. 
(Pl. XLIV, figs. 427 and 428.) 
1900, p. 201, Pl. XX XIII, fig. 206. 
Dioecious, nannandrous, idioandrosporous; oogonium 1, subglobose 
or obovoid-globose, pore median; oospore globose or subglobose, not 
filling oogonium, spore wall double: outer layer with 4-7 spiral ribs, 
anastomosate, united at the poles, inner layer smooth; androsporangium 
1-3; basal cell elongate; dwarf male a little curved, near oogonium, 
antheridium exterior, 1; vegetative cell 20-33 40-130u; oogonium 
52-60 X52-60u; oospore 46-5646-56u4; androsporangium 17-22 
11-14y; dwarf male stipe 11-16 41-59; antheridium 10-11 18—20z. 
Asia (Java). 
128a. Var. acutum West and West. 
(PI. XLIV, fig. 430.) 
1902, p. 128, Pl. 17, figs. 3-5; Hirn 1906, p. 22, Pl. III, fig. 14. 
Spiral ribs larger, irregularly and acutely dentate; vegetative cell 
20-26 X70-106u; oogonium 46-56 54-60; oospore 37-45% 3745p; 
dwarf male stipe 9-12 34-44; antheridium 8-9 x 14—-18u. 
United States: Mississippi; Ceylon, India. 
128b. Var. latviense Tiffany. 
Pl. XLIV, fig. 429.) 
1929, p. 75; Oe. spirale Hirn f. in Skuja 1927, p. 102, Pl. II, fig. 14 a-b. 
Pore supramedian or superior; vegetative cell 16-2065—-120y; 
oogonium 49-6065u; oospore (without ribs) 35-45x35—-45y, not 
filling oogonium, outer wall with 5-6 spirally arranged ribs; dwart 
male 12 50u. 432 
Latvia. 
