126 THE QEDOGONIACEAE 
globose, not quite filling oogonium, spore wall smooth; androsporangium 
1-9; dwarf male somewhat curved, on the suffultory cell; antheridium 
1-2; vegetative cell 18-23 X72-140y; oogonium 49-52 X 51-60; oospore 
45-49 X45-49u; androsporangium 17-208-18u; dwarf male stipe 
11-12 36—45y; antheridium 9-10 X 15-20u. 
United States: Ohio, Mississippi, Alabama, Massachusetts, 
Minnesota, Iowa; England, Sweden, Finland. 
Cf. Oe. braunit (No. 1382). 
134. Oe. manschuricum Skvortzow. 
(Pl. XLVI, fig. 442.) 
1926, p. 434, fig. &. 
Dioecious, nannandrous; oogonium 1, globose, pore supramedian; 
oospore globose or nearly so, not quite filling oogontum, outer spore 
wall echinate; dwarf male broadly egg-shaped, unicellular, on oogonium; 
vegetative cell 14-17X56-85u; oogonium 30-31X37-38y; oospore 
26-28 X 26-30u; dwarf male 13-24 X 20-87u. 
North Manchuria. 
Characterized by its echinate oospores and supramedian 
pores. To be compared with Oe. hystricinum (No. 122) and 
Oe. echinospermum (No. 124). 
135. Oe. sexangulare Cleve. 
(Pl. XLVII, fig. 454.) 
In Wittr. 1870, p. 131; Wolle 1887, p. 82, Pl. 79, figs. 8 and 9; Oe. hexagonum 
Kuetz. i1 Roumeguere Alg. Exs. No. 294 and Oe. vestcatum Link f. fuscescens Dupray 
in loc. cit. No. 687; Hirn 1900, p. 211, Pl. XX XV, fig. 216; P. B. A. No. 1679. 
Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), ~ 
sexangular-ellipsoid, pore a little above median; oospore same form as 
oogonium and nearly filling it, spore wall smooth; suffultory cell some- 
times slightly tumid; androsporangium 1-3; dwarf male on suffultory 
cell, a little curved, stipe of 2-3 cells, antheridium exterior, 1; vegetative 
cell 9-16 X30-110u; oogonium 29-33 X 33-394; oospore 27-31 X31-36y; 
androsporangium 13-14X10-14u; dwarf male stipe 7-9X21-30,; 
' antheridium 6-7 X 9-12uy. 
United States: Indiana, Mississippi, New York, Louisiana, 
Pennsylvania, Kentucky, Michigan; Austria, France, Norway, 
Sweden. 
135a. Var. angulosum (Hallas) Hirn. 
(Pl. XLVU, figs. 455 and 456.) 
1906, p. 21, Pl. III, fig. 17; Oe. angulosum Hallas 1905, p. 402, fig. 7. 
Smaller, oospore not filling oogonium; vegetative cell 10-14  15-54y; 
oogonium 19-30 30-42u; oospore 17—28X21-30u; dwarf male stipe 
6-7 X 18-21u; antheridium 6X 7u. 
Denmark. 
