GEDOGONIACE, 155 
Gdogonium vernale. (Hass) Wittr. Mon. didog. p. 10. 
Oogonia single, obversely egg-shaped or globose, opening 
with an operculum, fissure narrow, oospores globose, not filling 
the oogonium, spermogonia bicellular, sub-epigynous. 
Size. Cells 010-016 mm. by 44-6 times as long; oogonia 
339-045 x ‘045-051 mm. ; oospore 034-0388 x °0384-039 
mm.; sperm. cell :01--012 x 008-009 mm. 
Vesiculifera vernalis Hass. F. W. Alg. p. 484. 
Vesiculifera Candollei Hass. F. W. Alg. p. 208, t. 52, f. 9. 
Rabh. Alg. Eur. iii. 355. 
England. 
Plate LVIII. fig. 6. Gidogonium vernale with oogonia and spermo- 
gonia = 400. 
Gdogonium crispum. (Hass) Wittr. Mon. Gidog. p. 10. 
Oogonia single, obversely egg-shaped or globose, opening 
with an operculum, fissure narrow; oospores nearly globose, not 
filling the oogonium ; spermogonia 2-5 celled, hypogynous, or 
sub-epigynous; spermatozoids binate, terminal cell obtuse. 
Size. Cells -012-018 mm, 2-44 times as long; oogonia 
“037-049 x :042--054 mm. ; oospore -033-"046 x ‘034-046 
mm.; sperm. cell 009-014 x *007--012 mm. 
Kireh, Alg. Schles. p. 52. 
Versiculifera crispa, Hass. F. W. Alg. 203, t. 52, f. 8. 
Gidogonium rostellatum, Prings. Beitr. p. 69, t. 5, f. 1; 
Archer Quart. Journ. Micr. Sci., 1867, p.79; Rabh. Alg. Eur. 
iii, 347. 
Gidogonium pulchellum, Braun. Rabh, Alg. Eur. 2095. 
Britain and Ireland. 
“ This is one of several moncecious species, but it is also characterized 
by the oogonium not opening by a pore or aperture formed in its wall, 
for the admission of the spermatozoids, as is usual in this genus, but by 
a circumscissile dehiscence. From the cleft so produced an inner mem- 
brane projects, which seems to be itself perforate.” — Archer. 
Plate LVI. fig. 7. CEdogonium crispum with oogonia x 400. 
Gdogonium Vaucherii. (Le Clerc.) Braun. Chytr, t. 2, f. 18. 
Oogonia single, obversely egg-shaped, or globose, or nearly 
globose, opening by a pore above the middle; oospores globose 
or nearly globose, not completely filling the oogonium ; spermo- 
gonia 2-4 celled, sub-epigynous or hypogynous, spermatozoids 
binate. 
Size. Cells ‘02-03 mm, 14-4 times as long; oogonia 
04-055 x :045--065 mm. ; oospore °085-'05 x 035-052 mm.; 
sperm. cell ‘017-024 x :006-'011 mm. 
Z 
