52 THE (O12 DOGON TAGE AE 
29-36 (40) 29-36 (-40)u; dwarf male stipe 10-15 (21—) 24-32u; 
antheridium 8-10 X6-9u. 
Finland, France, Denmark, Sweden. 
184d. Var. propinquum (Wittrock) Hirn. 
(Pl. LVII, fig. 553.) 
1906, p. 42, Pl. IV, fig. 20; Oe. propinquum Wittr. 1870, p. 129, and im Hirn 
1900, p. 336, IPL SIG, fig. 243; Oe. eremitum Hallas 1905, p. 403, fig. 8. 
Smaller; oogonium 1-3; vegetative cell 8-14X18-70u; oogonium 
28-36 X 28-45u; oospore 24-31 24-3lu; dwarf male stipe 11-14x 
20-35; antheridium 7—9 (—12) *6-8u. 
United States: Illinois, Alabama; Austria, France, Sweden, 
Denmark, Latvia. 
184e. Var. hohenackerii (Wittrock) Tiffany. 
(Pl. LVII, figs. 554-556. ) 
1929, p. 75; Oe. hohenacherw Wittr. 1874, p. 23, and im Hirn 1900, p. 238, Pl. XL, 
fiz. 246; Oe. tumidulum in Hohenacker Alg. Exs. No. 404: 
Vegetative cell 12-15 2445y; oogonium 29-33 30-35; oospore 
27-31 28-31u; androsporangium 11-13 10-14u; dwarf male stipe 
9-14 18—24u,; antheridium 5-6 X5-8u. 
United States: Michigan, Ohio; India. 
184f. Var. scrobiculatum Ackley. 
(Pl. LVI, fig. 557.) 
1929, p. 305, Pl. XXXVI, figs. 17-19. 
Oogonium globose to subglobose; median layer of oospore wall 
scrobiculate; vegetative cell 9-11 27-60u; oogonium 32-35 X30-35y; 
oospore 31-33X31-32u; dwarf male stipe 1210-184; antheriditum 
8X 6-10y. 
United States: Michigan (Ox-bow of river near Holland). 
The macrandrium group is perhaps one of the most interest- 
ing and variable in the genus. The species has rather an 
unfortunate name to be nannandrous. The group is readily 
recognized by its frequently seriate oogonia, its curved and 
twisted dwarf males resting on or near the oogonia and fre- 
quently clustered, and its relatively short vegetative cells. 
Oe. laetevirens (No. 182) is separable from the group largely on 
its smaller size. F. lundense has very short vegetative cells, 
and those of var. hohenackerii are slightly longer. Var. scrobi- 
culatum is the only member of the group with scrobiculate 
oospores. The remaining forms and varieties are separable 
largely on the basis of size. 
