CONFERVACEJE. 
72 
2. Draparnaldia glomerata, Ag. ; frond vaguely much branched ; articulations of 
the main stems once or twice as long as broad, swollen in the middle ; pencils of ramuli 
alternate or scattered, often distant, ovate in outline, fasciculato-multifid. Ag. Syst. p. 
58. Kiitz. Sp. Alg. p. 356. Lyngb. Hyd. Dan . t. 64. Hass. Brit. Fr. W. Alg. 
p. 120, tab. 13,/. 1. Conferva mutabilis , Dillw. Conf. t. 12. E. Bot. t. 1746. 
Hab. In clear streams. New York, Professor Bailey. Rhode Island, Mr. Olney. 
(v. v.) 
Very similar to the last species, but less densely plumose, with scattered fascicles of 
ramuli. 
3. Draparnaldia plumosa, Ag.; frond very slender, elongate, much branched ; 
joints of the main filaments once or twice as long as broad ; pencils of ramuli opposite 
or whorled, plumose, much attenuated, pinnate or bi-pinnate, the apices of the pinnules 
acicular. Ag. Syst. p. 58. Kiitz. Sp. Alg. p. 357. Hass. Brit. Fr. W. Alg. p. 121. 
tab. 12, f. 1. 
Hab. In streams. West Point, Professor Bailey, (v. v.) 
More slender than D. glomerata , and much more branched, forming dense, gelatinous 
tufts, 3-6 inches long, often much drawn out in running water. In the American 
specimens the articulations of the stem and branches are about twice as long as broad, 
slightly constricted at the nodes, and swollen in the middle. Several seriated cells of 
this length follow each other, and then occur two or three short, nearly globular cells 
consecutively, which shorter cells emit the opposite or ternary penicillate ramuli. This 
alternation of longer and shorter cells occurs throughout the branch, the shorter ones 
always producing the ramuli. The ramuli are pinnate or bi-pinnate, but much less 
compound than in D. opposita or D. glomerata. 
The synonymy of this species is confused. The American plant differs slightly from 
the European specimens with which I have compared it, but I am not disposed to think 
it specifically different. Indeed the three forms now described as species are so similar 
in all essential respects, that it may well be questioned whether they should be kept 
separate. 
III. CLADOPHORA. Kiitz. 
Filaments (not gelatinous) tufted, articulated, uniform, branched. Articulations 
filled with green, granular endochrome, which is changed at maturity into zoospores. 
(Marine or in fresh water.) 
An immense genus, in which, for the present, are placed almost all the branching 
