292 RHODOPHYCER, 
“In no other Conferva is the number of the filaments so considerable 
as this. Their total diameter equals that of the largest horsehair. They 
divide in every direction from a little disc, ramify to infinity, observing 
remarkably well the dichotomous disposition in their first division, their 
branches becoming subsequently vague. Their total length extends even 
to four inches. 
“ From their origin even to their extremity these filaments are clothed 
with microscopic branches, so impacted that the whorls are not apparent 
in scarcely any direction; with a simple lens they are not better dis- 
covered, from which it might be supposed that one was observing a 
Thorea. It is but towards the points of the branches that, by the assist- 
ance of a strong lens, they are at last distinguished. These whorls are 
very closely approximated, horizontal, compressed the one upon the 
other, and becoming so confused as to form around the filament, which 
is green or yellow, and very flexible, a continuous duwn, mucous to the 
touch, sometimes very pale, more frequently of a very agreeable bluish 
watery green; this colour is, moreover, deep towards the point of the 
branches, As it grows old the plant turns yellow, and is discoloured.”— 
Bory. 
var. keratophytum. Bory. 
Beautiful blue-green, thin, very much branched, dichotomous, 
with the black setaceous base naked, branches all equal, slender, 
thin, apex slightly incrassated, whorls distinct. 
Size. Cellules clavate, about -03 x :015 mm. 
Batrachosperma keratophyta, Bory Ann. Mus, xx., t. 31, f. 2. 
Batrachospermum suevorum, Kutz. Spec. 536. 
Habit, colour, and ramification of B. vaguwm, but with the whorls dis- 
tinct. 
Plate CXXV. fig. u, portion of filament X 30; b, portion % 200 
diam. 
Batrachospermum atrum. Harv. Man. 119, 
Violet-coloured when moist, dark brown, almost black when 
dry, vaguely and much branched, reaching 2 inches, whorls 
abbreviated, distant; interstitial branchlets very short, one or 
two-celled. 
Size. Cellules ‘012 mm. diam. 
Jenner Tunb, Wells 176. Hass, Alg. 114, t. 16, f. 4. 
Conferva atra, Dillw. Conf. t. 11. Hull Br. Fl. 332. Huds. 
Ang. ii, 597. Eng. Bot. i., t. 690. With. Arr, iv., 184. 
Gray. Arr. i., 330. 
Batrachospermum detersum, Eng. Bot. ii., t. 2543. 
Batrachospermum moniliforme, v. detersum, Eng. FI, v., 388. 
Mack. Hib, 221. 
Batrachospermum moniliforme, var. i. atrum, Rabh. Alg, Eur. 
ili, 406. Kirch. Alg. Schles. 45. 
Lemanea setacea, Bory Ann. de Mus, t. 23, f. 3. 
In streams and ditches. 
Plate CXXVI, fig. 1. u, portion of filament X 30; b, portion x 200 
diam. 
