I 
CHAETOPHORA 209 
STIGEOCLONIUM LONGIPILUS Kütz. Phyc. Germ. 198. 1845; 
Tab. Phyc. 3: pf. 7. f. r. 1853. Wolle, F. W. Ale. 115. o 700. 
Jes, Be Ph TOD SF, IB. 1887. ; 
These three species are so similar in character that it is diffi- 
cult to discover adequate points of distinction. We have seen no 
American specimens that could well be identified with any of these 
species, and as Wolle's descriptions are somewhat modified in 
every case, we feel obliged to question his determinations of these 
forms. Stzgeoclonium longipilus minus, as issued in Phyc. Bor. 
Am., 865, corresponds to Hansgirg’s description, but it is doubt- 
ful if a form like this, only 4-6 in diameter ought to be consid- 
ered a variety of a species II-14 م‎ in diameter; this may be a 
young stage of S. dongipilus. 
III. CHAETOPHORA Schrank, Der Naturforscher, 19: 124- 
126. 1783; Baier. Flor. 2: 489-490. 1789 
Rivularia Roth, Cat. Bot. 1: 212-214. 1797. 
Myriodactylon Desvaux, Journ. de Bot. 2: 307. 1809. 
Thalli forming globular or elongated colonies, consisting of 
filaments arising in a dense mass from a palmelloid base and 
closely held together in an elastic, resistant, gelatinous substance. 
Filaments repeatedly branched, of nearly equal diameter through- 
out, the ultimate branchlets more or less fasciculate, often termi- 
nating in long hyaline setae. Chromatophore a parietal band in- 
closing one to several pyrenoids. 
Asexual reproduction by means of biciliate zoospores, formed 
in the cells of the branchlets. Akinetes may be formed (appar- 
ently ) in all cells. 
Inhabitants of fresh water. Type, C. globosa Schrank. [Etym. 
,اہر‎ hair; gopéw, to bear. ] 
Until 1812 the species which are now placed in this genus 
generally bore the name Rivularia Roth. At that time Agardh, 
in reviving the old genus Chaetophora Schrank, either made no 
attempt to identify the type species or could not. 
The genus Chaetophora was founded on two species. Of these, 
the second C. /obata, is plainly to be identified with our C. ineras- 
sata. The determination of the first or type species, C. globosa, is 
not so simple a matter. This was based on Müller’s Conferva 
stellaris, filamentis e bast orbiculari parallelis (Der Naturforscher 
