CHETOPHORACES. 195 
fascicles of branches lateral, more or less dense, spreading arti- 
culations more or less swollen, nearly equal in length and 
diameter, constricted at the joints, cell contents granulose, 
effused. 
Size. Cells ‘01-015 mm., of branches -008-:011 mm. 
Kutz. Tab. Phy. iii, t. 21, f. 2. Rabh. Alg. Eur. iii., 385. 
Kirch. Alg. Schl. p. 70. Eng. Fl. v., 389. Eng. Bot. ii, t. 
2546. Harv. Man. p. 122. Jobnst. Fl. Berw. ii., 261. Mack. 
Hib. p. 222. Hook. Fi. Scot. ii., p.76. Hass. Alg. 125, t. 9, 
f. 1, 2. 
Batrachospermum fasciculatum, Vauch, Conf, p. 116, t. 18. 
Ulva incrassata, Eng. Bot. i., t. 967. Huds. Fl. Ang. il, 
572, With. Arr. iv., 124. 
Conferva gelatinosa Dame cornu, Ray Syn. p. 60. 
Tremella gelatinosa Dama cornuum, Dill. Muse. 51, t. 10, f. 10. 
Rivularia incrassata, Purton Mid. FI. iii, p. 179. 
Myriodactylon endivefolium, Gray Arr, i., 302: 
In ditches, &e. 
Exceedingly variable in the form of the thallus, and hence divided 
into 7 or 8 varieties. 
Plate LXXVIIL. fig. 2. a, plants of Chetophora endivefilia, 
natnral size. 0b, portion of filament X 400 diam. 
Chetophora punctiformis. Kutz. Tab. Phye. iiv., p. 4, t. 18, f.2. 
Echinella articuluta, Eng. Bot, ii., t. 2555. 
Conferva echinata, Eng. Bot.i., t. 1378. 
Assuming that Mr, W. Phillips (Grevillea ix., p. 5) is 
correct in the presence of globose basal spores, this will have 
to find a place in Rivularia, and not in Chetophora. 
Genus 74, COLEOCHZETE. Bred. (1844.) 
Articulated filaments branched, either united in a pulvinule, 
or little cushion, or expanded in a flat, somewhat disc-shaped 
parenchymatous thallus ; cells oblong, more or less dilated in 
front, sometimes bearing from the back or upper surface a 
hyaline bristle, which is sheathed at its base. 
Propagation by oospores resulting from sexual fertilization, 
and by zoogonidia. Zoogonidia single in the fructiferous cells, 
either globose or broadly oval, furnished with two vibratile cilia. 
The Coleochzetezw are small discoid Algz, from 1 to 2 mm. in diam., 
bright green colour, constructed of branched rows of cells. They are 
found attached to submerged plants in stagnant or slow-moving streams, 
and form circular, closely-pressed discs. The chlorophyll is in parietal 
plates or large granules. Someof the cells bear colourless erect bristles 
fixed at the base in narrow sheaths, 
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