G@DOGONIACE. 151 
B. Oogonia furnished with verticellate median processes. 
u. Oospores subglobose. 
Gs. Itzigsohnii, De By. 
b. Oospores subellipsoid. 
G. excisum, Witir. § Lund. . 
Gi, Archerianum. Che. (Pringsheimianum, Archer). 
Sect. 2. Dicecious species, 
Sub-Sect. 1. Species with dwarf males. 
A. Species nith dwarf males unicellular, 
a. Oogonia furnished with verticellate processes in the 
middle. 
Ci, platygynum, Wittr. 
b. Oogonia always destitute of median processes. 
a Oospores globose or subglobose, 
G. Rothii, Le Cl. 
G. Areschougii, Wittr. 
i. pluviale, Nord. 
Gi. undulatum (Breb.). 
G. Reinschii, Roy, 
B Oospores subellipsoid. 
None. 
B. Species bicellular, spermogonia internal, with dwarf males. 
Gi. depressum, Prings. 
C. Species with dwarf males bi-multicellular, spermogonia external. 
a. Oospores even. 
a@ Oospores globose or subglobose. 
Gi. flavescens, Hass. 
Q, Brannii, Kutz. 
CG. macrandum, Wittr. 
. crassiusculum, Wittr. 
B Oospores ellipsoid or egg-shaped. 
G. Borisianum, Le Cl. 
G. concatenatum, Hass, 
Gi. acrosporum, D. By. 
. ciliatum, Hass. 
b. Oospores echinulate. 
a Oospores globose. 
_Gi, Cleveanum, Wittr. 
:. echinospermum, Br. 
8 Ooospores ellipsoid. 
None. 
Sub-Sect. 2. Species dicecious, with elongated male plants, 
a. Oospores echinulate. 
None. 
6, Oospores smooth. 
a Oogonia not, or slightly, swollen, 
GE. capillare, Z. — 
