146 THE OF DO CONTA CEAE 
171c. Var. bernardense (Bates) Hirn. 
(Pl. LV, fig. 525.) 
1900, p. 268, Pl. XLVI, fig. 286; Oe. bernardense Bates 1886, p. 313; Oe. londi- 
nense Wittr. var. compressum West 1891, p. 110, Pl. 18, figs. 10-12. 
Smaller; gynandrosporous; androsporangium to 8-seriate; vegetative 
cell 8-12 18—-45u; oogonium 25-31 21-32u; oospore 21-29 x 17—24y; 
androsporangium 7-11 5-11; dwarf male 6-7 X 10-12u. 
England, Spain. 
The tendency of the decipiens group toward capitellate 
cells reaches a maximum in f. dissimile. The others are either 
not noticeably or only somewhat capitellate. The small size, 
nannandrous habit, and median operculum are also character- 
istic. F. africanum is idioandrosporous, while f. bernardense 1s 
gynandrosporous. 
172. Oe. macrospermum West and West. 
(Pl. LV, figs. 527 and 528.) 
1897, p. 472, Pl. 7, figs. 6 and 7; Hirn 1900, p. 227, Pi. XX XVIII, fig. 232; Oe. 
macrospermum West and West f. patagonicum Borge and Hirn in Borge 1901, p. 9, 
Pl. 1, fig. 1, and im Hirn 1906, p. 18, Pl. III, fig. 18; Tiffany 1926, p. 105, PI. Vir, 
figs. 93 and 94. 
Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), 
subdepressed to depressed-globose, operculate, division median, narrow; 
oospore subdepressed-globose, filling the oogonium, spore wall smooth; 
dwarf male slightly curved or straight, not infrequently at right angles 
to the filament, on suffultory cell or on oogonium or scattered; anther- 
idium exterior, 1-4; basal cell elongate; androsporangium 1—?; vege- 
tative cell 10-16 30-80y; oogonium 39-46 3444u; oospore 36-44 
32-42u; dwarf male stipe 9-1416-30u; androsporangium 14-15 xX 
10-11; antheridium 7-10 6—-16y. 
United States: Iowa, Michigan, Ohio; England, Latvia; 
Patagonia. 
The above description as emended by Tiffany (1926) from 
material collected in Iowa includes f. patagonicum Borge and 
Hirn (Borge 1901). The species is characterized by its par- 
ticularly straight vegetative cells, narrow median operculum, 
and dwarf males scattered and often at right angles to the 
filament. 
173. Oe. costatum Transeau nov. sp. 
(PI. LVI, fig. 548.) 
Dioecious, nannandrous, gynandrosporous; oogonium 1, depressed 
globose, with verticillate folds forming distinct pointed projections at 
the suture, operculate, division narrow, supramedian; oospore depressed- 
globose, filling oogonium, spore wall smooth; androsporangium hypo- 
gynous; vegetative cell usually capitellate; terminal cell with rounded 
apex; vegetative cells 12-15X50-70u; oogonium 50-55 40-44; 
oospore 48-53 X36-42u; androsporangium 12-13X10-12u. 
