(2DOGONIACE. 157 
pore in the fissure, viewed from above stellate, with 7-10 rays, 
the depressions between the rays deep and rounded ; oospores 
globose, not filling the oogonium; spermogonia 1-2 celled, 
terminal cell obtuse or apiculate. 
Size. Cells -008--01 mm. by 3-6 times as long; oogonia 
034-088 x 032-04 mm. ; oospore 022-023 x *022-023 mm. ; 
sperm. cell -008--009 x 009-015 mm. 
Wittr. Mon. Cidog. p. 16. Kirch. Alg. Schles. p. 53. 
Archer, in Quart. Journ. Micr. Sci., 1866, p. 63, Rabh. Alg. 
Eur. iii., 352. 
Ireland, Scotland. 
This minute species Mr. Archer had found several times, and often 
showing its peculiarly-lobed oogonium, but he had never found the male 
fructification; he believed the plant must turn out to bea dicecious 
species; he had sometimes noticed a minute notch-like depression on 
the upper outer margin of the oogonium, probably indicating the ‘ micro- 
pyle.” He drew attention to the character, not adverted to by De Bary, 
that the apical or terminal joint of the filament possessed a short acute 
spine or mucro. This in old plants, frequently is not to be seen, as the 
terminal joint, or, indeed, considerable portions of the filaments, often 
become detached, and chiefly in a young condition only are the plants 
found entire.— Quart. Journ. l. c. 
Plate LIX. fig. 3. Gdogonium Ltzigsohnii, with oogonia and cospores ; 
a, transverse section of oospore x 400. 
b. Oospores subellipsoid. 
Gdogonium excisum. Wittr. £ Lund., in Wittr. Edog. Nov. p. 3, 
t.1, f. 1-4. 
Oogonia single, biconically-oblong, median processes 9, 
rounded, small, oogonia deeply cut round (circumscissile), 
vertical view orbicular, margin slightly undulated; oospores 
ellipsoid, as if constricted in the middle, not filling the 
oogonium. Spermogonia 1-2 celled, subepigynous or hypo- 
gynous, terminal cell obtuse, upper part. of the filament curved. 
Size, Cells 0035-005 mm. by 5-6 times as long; Oogonia 
‘018-015 x 018-025 mm.; oospore ‘009-012 x :015-'018 
mm.; sperm cell ‘003-0035 x :006-:007 mm. 
Wittr. Mon. Cidog. p. 16, Archer, Quart. Journ. Micr. 
Sci., 1875, xv., p. 102. 
Treland (rare). 
Plate LIX. fig. 4.. Edogonium excisum, with oogonia; a, section of 
oospore x 400, 
Cdogonium Archerianum, Cooke. 
Moneecious; oospore elliptic, its wall marked by somewhat 
coarse longitudinal strie, not filling the cavity of the much 
