CEDOGONIACE^. 175 



Bulbochcete Brebissoiaii. Kutz. lab. Phyc. iv, 19, t. 86. 



Oogonia obcordate-globose, truncate below, erect, seated 

 beneath terminal setas 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 3-4J 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. (Edog. p. 46. Rabh. Alg. Ear. Exs. 1055. 

 Rabh. Alg. Eur. iii. 359. 



Ireland. 



Plate LJ.V1I. fig,. 3. Bulbochosle Brebissonii, with oogonia, and dwarf 

 males x 400. 



Bulbochcete setigera. Ag. Syn. Alg. Scan. p. 71. 



Oogonia depressedly, somewhat quadrangularly globose, 

 seated beneath terminal setae, 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., 2J-5 times as long ; andro- 

 spore cells -018--02 X '014--018 mm. ; oogonia -075--08 X 

 U6--065 mm. ; dwarf males, -012--013 X '034--036 mm. 



Wittr. Mon. (Edog. p. 47. Prings. Beitr. 72, t. 6, f. 3. 

 Kirch. Alg. Schles. p. 61. Rabh. Alg. Eur. 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. 



Bulbochaete Rothii Gray. Arr. 1, 321 (?). 



Britain, Ireland. 



Plate XLVIIL fig. 1. Bulbochcete setigera, with oogonia and dwarf 

 males ; a, b, c, development of young plants x 400. 



Bulbochcete gigantea. Prings. Beitr. 71, t. 6,/. 1. 



Idio-androsporous? Oogonia rather depressed obcordate- 

 globose, seated beneath terminal setas, 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--OU x '02--022 mm. 



