Ser. CHLOROSPERMES. - Fam. Oscillatoriee. 
Prater LVIII. 4. 
CALOTHRIX FASCICULATA, “%. 
Gen. Cuar. Fi/aments destitute of a mucous layer, erect, tufted, or aggre- 
gated, fixed at the base, somewhat rigid, not oscillating. Zude con- 
tinuous ; endochrome green, densely annulated, at length dissolving 
into lenticular sportdia. Catoturix (4y.)—from ards, beautiful, 
and @pié, a hair. 
CaLoturix fasciculata; stratum velvetty, dark green, of indefinite extent ; 
filaments very straight, subulate, much attenuated, fasciculately pseudo- 
branched. 
CaLorurix fasciculata, 4g. Syst. p. 71 (excl. syn.). Harv. in Hook. Br. Fl. 
vol. i. p. 368. Harv. in Mack. Fl. Hib. part 3. p. 237. Harv. Man. p. 158. 
Has. Spreading over the surface of marine rocks, about half-tide level ; 
probably common. Annual? Found at all seasons. Miltown Malbay, 
Wor, i. 
Grocr. Distr. Baltic Sea. British Islands. 
Descr. Stratum of indefinite extent, from a few inches to several feet in diameter, 
of a dark, shining green colour. Filaments from two to three lines in height, 
tufted, erect, straight, tapering to a long, setaceous, pellucid point. In an 
early stage of growth they are quite simple, and sometimes remain so, but 
more generally they are furnished with from two to six or more, erect, 
closely pressed pseudo-branches. Striz or annuli strongly marked, and closely 
set. Colowr under the microscope, a deep, glaucous green. 
een 
This is nearly related to C. scopulorum, which I have therefore 
figured on the same plate; and I am by no means sure that it 
should not be considered as merely a more developed form of 
that plant, the differences bemg occasioned by its growing at a 
greater depth, and in places where it is more constantly sub- 
merged. The filaments are taller, straighter, more acuminate, 
and of a deeper green than in C. scopulorum, and very frequently 
are furnished with tufts of accessory branches, but this is a 
character of minor importance. 
The genus Calothriz, as defined by Agardh, contams many 
species, the majority of which, as of the Osci//atoriee in general, 
are found in fresh water. By Kiitzing this genus has been 
broken up into several, and formed into a distinct family, an 
innovation of very questionable character, productive of a host of 
new synonymes. 
A. Fig. 1. CaLoTHRIx FAscicULATA. Portion of the stratum :—¢he natural 
size. 2. A tuft of filaments. 3. Apex of a filament :—magnified. 
