288 RHODOPHYCES. 
with absolute certainty, but they are believed to directly develop the new 
plant.”— Wood's Fresh Water Alge of U.S., p. 218. 
It is somewhat uncertain what should constitute the limits of species 
in this genus, so that, with the exception of B. atrum, we have not de- 
parted from the most generally accepted series, although we fail to dis- 
tinguish more decided specific characters to separate B. vagum from B. 
mondiforme than can be found between, so-called, varzeties of these 
species. 
Batrachospermum moniliforme. Roth. Cat. Bot. 11., 160. 
From one inch to a foot in length, clothed with a more or less 
firm gelatinous mucous, violet-brownish, reddish-brown, purple, 
or bluish-green, vaguely and profusely branched, joints of the 
branches similar, oblong or clavate, outer ones sometimes seti- 
gerous, internodes naked, or furnished with scattered accessory 
branches, 
Size. Cellules :02--022 x :01 mm. 
*Rabh. Alg. Eur. iii., 405. Kirch. Alg. Schles. 45. Eng. Fl. 
vy. 388. Jenner, Tunb. Wells, 176. Eng. Bot. ii., t. 2542. 
Harv. Man. 119. Johnst. Fl. Berw. ii, 257. Mack. Hib. 221. 
Hass, Alg. p. 109. Hook. Fl. Scot. ii, 77. Gray Arr. i., 330. 
Vauch. Conf. 112, t.1,f. 53 t. xi, f. 4. 
Conferva gelatinosa, Dillw. Conf. t. 82. Relh. Cant. Supp. 
21. Hull Br. Fl. 332. Eng. Bot. i., t. 689. Huds. Ang. ii., 
597. With. Arr.iv.,134. Lightf. Fl. Scot. 986. Sibth. Ox. 
337. Abbot. Bedf. 275. 
Conferva fontana nodosa spermatis ranarum, Ray Syn. 62. 
Dill. Muse. 36, t. 7, f. 42-46. 
BRatrachosperma ludibunda moniliformia, Bory. Ann. des Mus. 
xx., t. 30, f. 1. 
In streams and ditches. 
Plate CXX. fig. a, portion of filament X 30 diam. ; J, portion X 200 
diam. 
var, setigerum. Rabh. Alge Exs. No. 854. 
The extremities of the moniliform branchlets attenuated into 
a long setiform thread. 
Sizz. Cells -02 --024 y -01 mm. 
var, pulcherrimum. Bory. Ann. des. Mus. p. 40. 
About four inches long, violet or purple, the gelatinous in- 
vestment less developed. Branches elongated, whorls rather 
distant, globose, with the apices of the branchlets almost con- 
fluent, interstitial spaces nearly naked. 
Size. Cellules 018 x-01-:012 mm. 
Kirch. Alg. Schles, 45. Rabh. Alg. Eur. iii., 405. 
Batrachospermum pulcherrimum, Hass. Alg. 109, t. 14, f. 1. 
Batrachosperma ludibunda pulcherrima, Bory. loc. cit. 
