OEDOGONIUM 135 
149e. Var. hormosporum (West) Hirn. 
(Pl. LII, figs. 491 and 492.) 
1900, p. 255, Pl. XLIV, figs. 269 and 270; Oe. hormosporum West 1897, p. 5. 
Oogonium and oospore smaller; oogonia 2-10 (rarely 1), andro- 
sporangium up to 15-seriate; vegetative cell 22-30 X 76-180y; suffultory 
cell 835-45 X 52-112y; oogonium 48-57 X 56-95y; oospore 46-55 & 53-65; 
androsporangium 18-22 12-24yu; dwarf male 9-13 47—54u. 
Africa. 
The species is readily identified among the nannandrous 
group by the irregular longitudinal ridges appearing on the 
median oospore wall. The suffultory cells are very much 
enlarged. The varieties and forms are separated largely on 
the basis of size. It differs from Oe. wolleanum (No. 150) 
in its smaller number of ribs. Fritsch and Rich (1924) record a 
form of Oe. cyathigerum with suffultory cell not always swollen 
and with frequently globose oospores. This is perhaps merely 
a slight variation of var. ellipticum. 
150. Oe. wolleanum Wittrock. te 
(Pl. L, figs. 479 and 480.) 
1878, p. 137; Wolle 1887, p. 82, Pl. 80, figs. 4 and 5; Oc. aphophysatum A. Br. in 
Rabenh. Alg. Sach. No. 291, 1853; Oe. concatenatum (Hass.) Kuetz. f. Juxurians Breb. 
in Roumeg. Alg. Exs. Nos. 683 and 1062; Hirn 1900, p. 220, Pl. XX XVII, fig. 226. 
Dioecious, nannandrous, gynandrosporous or idioandrosporous; 
oogonium 1-4, subobovoid or quadrangular-ellipsoid, pore superior, 
wall with raised longitudinal lines on the inner surface; oospore of 
same form as oogonium, quite filling it, outer layer of spore wall with 
25-35 longitudinal ribs, rarely anastomosate, inner layer smooth; 
androsporangium 1-3, often subepigynous or scattered in the upper 
part of the filament; basal cell elongate; terminal cell, sometimes 
oogonium, short-acute or acuminate; dwarf male on suffultory cell, 
stipe slightly curved; antheridium exterior, 1-3; vegetative cell 21-30 
65-235u; suffultory cell 45-5668-110u; oogonium 58-68 X69-89y; 
oospore 56-66 X65-83u; androsporangium 21-30 18-25u; dwarf male 
stipe 15-24 54-60u; antheridium 9-14X7-11p. 
United States: Massachusetts, Connecticut, New Jersey, 
Iowa, Pennsylvania, Minnesota, Florida, Illinois; Brazil; India; 
France, Latvia, Germany; Australia; Greenland. 
150a. Var. concinnum Hirn. 
(Pl. L, fig. 481.) 
1900, p. 222, Pl. XX XVII, fig. 228. 
Smaller; oospore not quite filling oogonium; ribs of outer layer of 
spore wall finely crenulate; vegetative cell 19-27 80—-180u; suffultory 
cell 41-52 X 72-150; oogonium 54-63 X 63-93u; oospore 52-61 X 62-74; 
dwarf male stipe 16-20 50—-50u; antheridium 10-13 10-15y. 
United States: Minnesota. 
