172 NEMATOPHYCES. 
Kutz. Tab. Phy. iii., t. 33, f. 6. Wittr. Mon. Ciidog. p. 38. 
Britain. 
Plate LXIV. fig. 4. Cdogonium longatwm, parasitic upon another 
species, with oogonia x 400. 
Gdogonium vesicatum. (Lyngb.) Wittr. Mon. Edog. p. 39, 
Oogonia single, ellipsoid, globose, opening by an operculum, 
with a narrow fissure ; oospores ellipsoid-globose, almost filling 
the oogonium. 
Size. Cells :017--21 mm. 13-3 times as long; oogonia 
043-045 x °051-06 mm.; oospore :037-088 x :041--042 
mm. 
Kirch. Alg. Schles. p. 59. 
Conferva vesicata Lyngb. Hydro. 144,+.47,f, D1. Eng, 
Bot. t. 2476. 
Scotland. 
Plate LXV. fig. 5. Cidogonium vesicatum, with oogonium x 400, 
Gdogonium grande. Kutz. Tab. Phy. 11, t. 37,7. 1. 
Oogonia oval-elliptic, nearly twice as long as broad; oospores 
oval-elliptic, entirely filling the oogonia; basal cell contracted 
towards the base, then dilated and discoid; terminal cell 
obtuse. 
Size. Cells -025--035 mm. 3-4 or 5 times as long ; oogonia 
‘1 x :07 mm.; oospore (09 x ‘065 mm. 
DeBary Cidog. t. 2, f. 1-14. Rabh, Alg. Eur. iii., 353. 
Scotland, 
Plate LXVI, fig. 4. Cdogonium grande, with oogonium x 400. 
CGdogonium giganteum. Kutz. Phyc. Germ. p. 200. 
Oogonia single, a little swollen, cylindrically egg-shaped, 
opening with a pore above the middle; oospores cylindrically 
ellipsoid, nearly filling the oogonia (sometimes flask-shaped, 
short necked, and then filling the oogonia), epispore delicately 
scrobiculate, supporting cells rather swollen. 
Size. Cells 03-024 mm. 2-43 times as long ; supporting 
cells 054-06 mm. 13-13 times as long ; oogonia :057-'069 x 
‘078-106 mm. ; oospore ‘054-065 x :075-"103 mm. 
Kutz. Tab. Phye. iii, t. 87, f.2. Wittr. Mon. Cidog. p. 42. 
Kirch. Alg. Schles. p. 59. 
Vesiculifera lacustris Hass. F. W. Alge 198, t. 52, f. 1. 
Gdogonium lacustre Rabh. Alg. Eur. iii, 356, 
Plate LXV. fig. 3. Cdogonium giganteum, with oogonia x 400. 
