(EDOGONIACB^E. 163 



(Edogonium concatenatum. (HassS) Wittr.Mon. (Edog. p. 25. 



Gynandrosporous. Oogonia 2-6 continuous, or single, egg- 

 shaped, or quadrangularly ellipsoid, opening by a pore above the 

 middle ; oospores filling the oogonia, sporoderm delicately 

 porose ; supporting cell swollen; androsporangia 2-4 celled; 

 terminal cell obtuse, dwarf males curved, seated on the sup- 

 porting cells; spermogonia 2-4 celled. 



SIZE. Cells -025-'04 niin., 3-10 times as long; supporting 

 cells -058--062 mm., 2^ times as long ; oogonia -07--083 x 

 09--105 nim. ; oospores -065--076' X 087--095 mm. ; androsp. 

 cell -027--028 x -03--036 mm.; sperm cell -013--015 x '022- 

 025 mm. 



Kirch. Alg. Schles. p. 55. 



Vesiculifera concatenate*,, Hassall F. W. Algas t. 51, f. 6. 



(Edogonium apophysatum, Pringsh. Beitr. p. 71, t. 5, f. 9. 

 Rabh. Alg. Eur. iii., 351, in part. 



Britain. 



Plate LJ.I.Jig, 1. (Edogonium concatenatum, with oogonium and 

 thickened supporting cell bearing the dwarf males ; a, androsporangia 

 x 400. 



(Edogonium acrosporum. De Bary. (Edog. p. 60, t. 3, /. 1-12, 



Idioandrosporous. Oogonia solitary, terminal, ellipsoid, 

 opening by a small apical deciduous (or evanescent) operculum ; 

 oospore manifestly filling the oogonia, membrane longitudinally 

 costate ; supporting cells often swollen, terminal cell obtuse; 

 dwarf males curved, seated on the supporting cells, stem often 

 bicellular, upper cells of the stem very long ; spermogonia 1-2 

 celled. 



SIZE. Cells '01-'014 mm., 2-7 times as long; supporting 

 cells '015-'018 mm., 2-3 times as long; oogonia '03-'035 x 

 045--051 mm. ; sperm, cell -006--008 x -014--015 mm. 



Archer in Quart. Journ. Micr. Sci. 1867, p. 80, 1868, p. 

 295. Wittr. Mon. (Edog. p. 16. Rabh. Alg. Eur. iii, 351. 



Britain, Ireland. 



The terminal oogonia are characteristic of this species, which can 

 scarcely be confounded with any other. 



Plate LXI. fig. 2. (Edogonium acrosporum, with terminal oogonia, 

 after De Bary'x 400. 



(Edogonium ciliatum. (Hass.} Prings. Beitr. 70, t . 5, /. 8. 



Gynandrosporous. Oogonia 2-7, continuous or single, egg- 

 shaped, opening by an operculum, with a broad fissure ; oospores 

 egg-shaped, nearly filling the oogonia; androsporangia 2-8 

 celled, terminal cell setiform, dwarf males curved, seated on the 

 oogonium ; spermogonia unicellular. 



2 A 



