CEDOGONIACE. 168 
Gdogonium concatenatum. (Hass.) Wittr. Mon, Gidog. 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. 
Sizz.—Cells :025--04 mm., 3-10 times as long; supporting 
cells -058-062 mm., 24 times as long; oogonia ‘07-083 x 
“09-105 mm. ; 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 concatenata, Hassall F. W. Alge t. 51, f. 6. 
Gedogonium apophysatum, Pringsh. Beitr. p. 71, t. 5, f. 9. 
Rabh. Alg. Eur. iii., 351, in part. 
Britain. 
Plate [XI fig. 1. Cdogonium concatenatum, with oogonium and 
thickened supporting cell bearing the dwarf males; a, androsporangia 
x 400. 
CGdogonium acrosporum. De Bary. Edog.p. 60, t.3, f. 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. 
S1zz.—Cells *01-'014 mm., 2-7 times as long; supporting 
cells -015--018 mm., 2-3 times as long; oogonia ‘038-035 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. Gidog. 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 LXTI. fig. 2. Cidogonium acrosporum, with terminal oogonia, 
after De Bary x 400. 
Gidogonium ciliatum. (Hass.) Prings. Beitr. 70, t. 5, f. 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. 
2A 
