70 
CONFERVACEiE. 
emitting at short intervals tnfts of multifid bright-green ramuli. Ag. Syst. Alg. p. 28. 
Lyngb. Hyd. Dan. t. 65, Jig. C. Kutz. Sp. Alg. p. 532. Hass. Brit. Fr. W. Alg. 
p. 125, t. 9, Jig. 1-2. 
Hab. On sticks and stones, in running streams and ponds. Near West Point, Prof. 
Bailey. Cumberland, Rhode Island, Mr. Olney. South Carolina, Mr. Ravenel. (v. v.) 
Frond gelatinous, varying greatly in size and in ramification ; the younger specimens 
thicker, with fewer branches ; the older attenuated and compound. The American 
specimens before me are 1-3 inches long, and from 1-2 inches in the expansion of the 
branches. Their fronds are not more than half a line in diameter, linear, filiform, and 
excessively branched, the branches very much crowded on a prolonged axis, from which 
they issue without order and are directed to all sides. They are sub-dichotomous, and 
more or less densely set with divaricated, simple or forked ramuli. When a portion of 
a branch is examined with a magnifier, it is seen to be composed of several parallel, 
longitudinal, articulated filaments, lying apart from each other, being separated by a 
gelatinous matrix ; their cells are 4-6 times as long as broad, hyaline or marked with 
a central transverse band of granules, and they emit, at short intervals, horizontally 
spreading, multifid, coloured ramuli. The branching of the ramuli is irregular, and 
between fasciculate and pinnate, the ramification being sometimes densely crowded, 
sometimes distant. The cells of these ramuli are filled with green endochrome ; they 
are 2-3 times as long as broad, and the terminal cells, which are short, are either 
simple or carry at their summit a long bristle-shaped acumination. Substance gelatinous. 
The plant closely adheres to paper in drying. 
This species occurs in fresh-water ponds and streams in all parts of Europe, and its 
many minor varieties have received several names. All agree in microscopic structure. 
The ramification of the gelatinous matrix alone is variable, and that is a character of 
very little moment. Professor Bailey’s specimens are labelled “ Batrachospermum 
Americanum, Schweinitz a synonym referred by Agardh to his Draparnaldia 
oppo'sita , which is quite different from the Alga now described. 
2. Chjetophora pisiformis , A g. ; frond globose, carnoso-gelatinous, formed of nume- 
rous erect, radiating, sub-parallel filaments emitting to the circumference dichotomo- 
multifid patent branches. Ag. Syst. p. 27- Hass. Brit. Fr. Wat. Alg. p. 128, t. 9, 
fig. 5^6. Kutz. Sp. Alg. p. 532. 
Hab. On sticks, in fresh-water ponds and ditches. Dr. Witt’s Meadow, New York, 
Prof. Bailey, (v. v.) 
Frond the size of a pea, or less, globose, several occurring together on the same stick, 
gelatinous, but rather firm, bright green. When bruised between two glasses, and 
examined under the microscope, the gelatinous matrix which forms the globe is seen to 
be everywhere filled with much branched filaments which rise from the base and radiate 
