GDOGONIACES, 165 
Ireland, Scotland. 
Of these two species with echinulate oospores, the spines of the 
former are broader at the base and conical, whilst in this they are slender, 
and but slightly thickened downwards. 
Plate LXII. fig. 2. Edogonium echinospermum, with oogonia and 
echinulate oospores x 400. 
Sus-section 1. Diccious, with elongated male plants. 
Oogonia, not, or scarcely, swollen. 
CGdogonium capillare. (Lin.) Kutz. Phyc. Gen. 225, ¢. 12, 
f. 1-10. 
Oogonia single, not swollen, cylindrical, opening by a pore 
above the middle; oospores globose or cylindrical-globose 
(somewhat quadrangular in longitudinal section) not filling the 
oogonia; male plants the same or almost the thickness of the 
female plants; spermogonia 1-4 celled, alternate with the 
vegetative cells: spermatozoids binate. 
Size. Cells -035--055 mm., equal or twice as long; oogonia 
14 times as long ; oospore ‘03-052 x ‘039-063 mm. ; sperm. 
cell :03-'048 x :005--006 mm. 
Kirch. Alg. Schles. p. 56. Rabh. Alg. Eur. No. 1180, 1417. 
Wittr. Mon. Cidog. p. 30. 
Conferva capillaris, Linn. Spec. Pl. 1636. 
Gdogonium regulare, Vaup. Beitr. Cidog. p. 218, t. 1, f. 
1-10, not the Vesiculifera capillaris of Hassall. 
Britain. 
Plate LX11. fig. 3. Cdogonium capillare, with oogonia x 400. 
b. Oospores manifestly swollen, 
aa. Oospores globose, or nearly so. 
Gdogonium caleareum. Cleve in Wittr, Disp, Edog. p. 135. 
Oogonia single (very rarely twin), depressedly globose, 
opening by a pore at the middle; oospores filling the oogonia, 
male plants the same, or almost the same, thickness as the 
female; spermogonia 2-5 celled; spermatozoids single (?). 
Sizz. Cells -011-014 mm., 2-4 times as long; oogonia 
027-03 x :021--023 mm.; oospores '026-:028 x ‘02-021 
mm.; sperm. cell ‘01--011 x :009-:012 mm. 
Wittr. Mon. Gidog. p. 32. 
Vesiculifera compressa, Hass. F. W. Alge, 204, t. 53, f. 4. 
CGidogonium compressum, Rabh. Alg. Eur. iii., 348. 
Britain, 
Specimens from the warm tank in the Victoria House, Kew Gardens, 
had shorter cells than usual. It has apparently a tendency to become 
more or less coated with a deposit of lime. 
