ALGÆ ANTARCTIC. 297 
Hs. Kerguelen's Land, in alpine rivulets. 
Tufts extensively spreading, about 1 an inch high, of a 
very dark, blackish olive colour. Threads much thicker than 
those of C. distorta, very flexuous, cohering often for their 
whole length in crisped bundles. Colour, under the glass, 
glaucous, with a golden tint.—A very pretty species. 
73. Oscillatoria purpurea, Hook. fil. et Harv.; strato gelati- 
noso tenaci siccitate translucente purpureo, filis violaceis 
omnium tenuissimis dense intertextis curvatis longe radi- 
antibus, striis inconspicuis. 
Has. Kerguelen’s Land, in rivulets among the hills, 3,700 
feet. 
Covers mosses and water plants, with a gelatinous, purple 
pellicle, more transparent than common in the genus. Ina 
dry state the filaments, which, under the highest power of 
the microscope are seen as thin lines, are of a fine purple 
colour, and fringe the stratum to nearly + inch depth. 
74. Sphærozyga fenaz, Hook. fil. et Harv.; strato fluctuante 
definito gelatinoso lobato tenaci æruginoso, filis densissime 
intertextis flexuosis sub lente glauco-viridibus moniliformi- 
bus hic illic articulo majori elliptico interruptis. 
Has. Falkland Islands, in fresh water. 
With a gelatinous stratum, nearly as firm as that of Nostoc 
ceruleum, this presents all the essential characters of Sphe- 
rozyga ; to the naked eye it resembles an Oscillatoria. It is 
a species of large size. 
75. Ulva tesellata, Hook. fil, et Harv.; fronde (mediocri) sic- 
citate rigidiuscula tenuissima membranacea foliacea fusco- 
viridi expansa in lacinias plures undulato-crispas fissa 
tesserato-areolata, areolis quadratis lineis hyalinis cireum- 
scriptis, granulis magnis quaternis. 
Han. Kerguelen's Land, on rocks in the sea. 
Frond 1.2 inches high, dull green, leafy. Structure very 
similar to that of U. crispa, but the habit and habitat is that 
of U. latissima. Some of our specimens are profusely covered 
with sphærical bodies, immersed in the frond, and resembling 
the capsules of a Nitophyllum, which probably are incrassa- 
VOL. IV. E. 
