GEDOGONIACE. 175 
Bulbochete Brebissonii. Kutz. 7ab. Phyc. 1v, 19, t. 86. 
Oogonia obcordate-globose, truncate below, erect, seated 
beneath terminal sete or androsporangia, dissepiment of sup- 
porting cell low, epispore delicately crenulate ; androsporangia 
2-3 celled, scattered or epigynous ; dwarf males seated on the 
oogonia, rarely around it, stem straight, or nearly so. 
Size. Cells -017-'02 mm. by 3-44 times as long; andro- 
spore cells 015 x -:015--018 mm.; oogonia ‘042-05 x 
°037-°045 mm. ; dwarf males °01--012 x -028--033 mm. 
Wittr. Mon, Gidog. p. 46. Rabh. Alg. Eur. Exs. 1055. 
Rabh, Alg. Eur, iii. 359. 
Treland. 
Plate LXVII. fig. 3. Bulbochete Brebissonti, with oogonia, and dwarf 
males x 400. 
Bulbochete setigera. Ag. Syn. Alg. Scan. p. 71. 
Oogonia depressedly, somewhat quadrangularly globose, 
seated beneath terminal set, or beneath androsporangia ; mem- 
brane of the oogonium after fertilisation thickened ; dissepiment 
of supporting cell a little above the middle, or at the middle ; 
epispore granulated ; androsporangia scattered or epigynous, 
bicellular; dwarf males seated upon or about the oogonia, stem 
straight. 
Size. Cells 025-028 mm., 23-5 times as long; andro- 
spore cells :018--02 x °014--018 mm.; oogonia ‘075-:08 x 
‘06-065 mm.; dwarf males, ‘012-013 x -034--036 mm. 
Wittr. Mon. Cidog. p. 47. Prings. Beitr. 72, t. 6, f. 3. 
Kirch, Alg. Schles. p. 61. Rabh. Alg. Hur. iii., p. 358. Hass. 
Alg. t. 54, f. 1-4. Eng. Bot. ii. t. 2472. Eng. Fl. v, p. 350. 
Conferva vivipara Dillw. Conf. t.59. Eng. Bot. i, 2086. 
Bulbochete Rothii Gray. Arr. 1, 821 (?). 
Britain, Ireland. 
Plate XLVIIL. fig. 1. Bulbochete setigera, with oogonia and dwarf 
males; a, 6, c, development of young plants x 400. 
Bulbochete gigantea. Prings. Beitr. 71, t. 6, f. 1. 
Idio-androsporous? Oogonia rather depressed obcordate- 
globose, seated beneath terminal setz, rarely beneath vegetative 
cells; dissepiment of supporting cell at or a little above the 
middle ; epispore verrucose; dwarf males a little longer than 
the oogonia, and seated upon it; stem twice as long as the 
spermogonium, arcuate, 
Size. Cells ‘024-027 mm. by 2-3 times as long; oogonia 
062-066 x °051--058mm.; stem of dwarf males ‘011-012 x 
‘04-045 mm. ; sperm. cell -013--014 x ‘02-022 mm, 
