GDOGONIACEA, 159 
Wittr. Mon, Gidog. p. 18, Kirch. Alg. Schl. p. 53. Rabh. 
Alg. Eur, iii, 348. 
Vesiculifera Rothit, Hassall, t. 53, f. 7 ? 
Prolifera Rothii, Le Clerc Prolif. 476, t. 23, f. 8? 
Scotland, Ireland, England, 
Mr. Archer mentions this plant as having been found by him with a 
chain of as many as eleven oogonia in succession.— Quart. Micro. Journ., 
1866, p. 69. 
Plate LIX. fig 6. Gdogonium Rothii with oogonia, androsporangia, and 
dwarf males x 400. 
Gdogonium Areschougii. Wittr. Disp. Gdog. p. 122. 
Gynandrosporous. Oogonia 2-6, continuous or single, rather 
depressedly globose, broadly cut round (circumscissile) in the 
middle, opening by a pore in the fissure. Oospore exactly 
globose, not by any means filling the oogonium. Androspo- 
rangia 1-6 celled, hypogynous or subepigynous, or rarely 
scattered, terminal cell (which sometimesis the androsporangium), 
obtuse, dwarf males obversely egg-shaped, séated on the oogonia. 
Size. Cells ‘008-012 mm., 4-6 times as long; Oogonia 
038-039 x ‘036-04 mm.; oospore *022-'024 xX 022-024 
mm.; androsp. cells ‘01--011 x ‘01-012 mm.; dwarf males 
‘006-007 X 014-015 mm. 
Archer in Quart, Journ. Micr. Sci. 1872, xii., p. 422. Wittr. 
Mon. Chdog. p. 19. 
Treland. 
Plate LIX. fig 7. Cdogonium Areschougii with oogonia, andro- 
sporangia, aud dwarf maies X 400—after Wittrock. 
Gdogonium pluviale. Nordst. Rab, Alg, Eur. No. 2257. 
Idio-androsporous. Oogonia simple, rarely 2-3 continuous, 
obversely egg-shaped, globose, or nearly globose, opening by a 
terminal operculum, fissure narrow ; ovospores nearly globose, 
almost filling the oogonium, terminal cell obtuse, filaments 
bearing the androsporangia a little slenderer than the female 
filaments; androsporangia 6-10 celled; dwarf males broadly 
obverse egg-shaped, seated on the oogonia. 
Sizz. Cells 018-028 mm., equal to three times as long; 
oogonia :034-039 x :034-045 mm.; oospore *032-'037x 
031-04 mm.; androsp. cell ‘017-019 x ‘006-'011 mm. ; 
dwarf males ‘01 x -015 mm, 
Wittr. Mon. Cidog. p. 19. 
Gdogonium diplandrum, Jur. Beitr. Cidog. p. 27, t. 1-3. 
Vesiculifera dissiliens, Hass, F. W. Alg. 202, t. 50, f. 7. 
Plate LIX. fig. 8. Gdogonium pluviale with oogonia and dwarf 
male x 400. 
