162 NEMATOPHYCER. 
Gdogonium crassiusculum. Wittr. Disp. dog. p. 132. 
Gynandrosporous. Oogonia single, or twin, globose egg- 
shaped or nearly globose, opening by a pore above the middle ; 
oospores ellipsoid-globose or globose; membrane very thick, 
almost filling the oogonia; androsporangia 2-5 celled; dwarf 
males nearly straight, seated on or about the supporting cells; 
spermogonia 1 (?) celled. 
Size. Cells :027--03 mm., 33 to 5 times as long; oogonia 
°054--06 x 06-075 mm.; oospore :051-°057 x :052-°063 mm. ; 
androsp. cells ‘026-028 x-01--018 mm.; sperm. cell -007-:009 
mm. 
Wittr. Mon. Gidog. p. 24. 
Epping Forest (1882). 
We have only found this species once in pools on the Loughton side 
of Epping Forest, but the very thick coat of the oospore is remarkably 
distinct, combined with other characters, so as to render its determina- 
tion certain. 
Plate LX. fig. 5. Cdogonium crassiusculum with oogoniam and 
dwarf males; a, androsporangia ; 0, mature oospore x 400. 
6. Oospores ellipsoid or egg-shaped. 
Gdogonium Borisianum. (Le Clerc.) Wittr. Disp. Edog. p. 132. 
Gynandrosporous (or idio-androsporous ?). Oogonia single 
or twin, obversely egg-shaped, opening by a pore above the 
middle; oospores obversely egg-shaped, almost filling the 
oogonia; supporting cells swollen; androsporangia 2 ? celled, 
terminal cell (which sometimes is the oogonium) obtuse, dwarf 
males a little curved, seated on the supporting cells ; spermo- 
gonia unicellular. 
Sizz. Cells -015--021 mm., 3-5 times as long ; supporting 
cells -03-'033 mm., twice as long; oogonia *045-'05 x 06-075 
mm.; oospore ‘04-044 x°051--054 mm.; androsp. cell :017- 
-018 x -015--02 mm.; sperm. cell -01 x 021 mm. 
Wittr. Mon, Cidog., p. 25. Kirch. Alg. Schles. p. 55. 
Prolifera Borisiana, Le Clerc Prolif. 175, t. 23, f. 6. 
Gdogonium apophysatum, Braun, in Kutz. Sp. Alg. p. 366. 
Kutz. Tab. Phy. iii., t. 85, £5. Rabh. Alg. Eur, iii., 251. 
Gedogonium setigerum, Vaup. Iagt. Gidog. 17, t. 1. Archer 
in Quart. Journ. Micr. Sci. 1866, p. 69. 
Britain, Ireland. 
See Mr. Archer’s detailed account of this species in the place above 
quoted. 
Plate LX. fig. 6  CGdogonium Borisianum, with oogonium and 
thickened supporting cell bearing the dwarf males; a, androspore 
x 400. 
