i) Pye 
Ser. CHLOROSPERMES. Fam. Confervee. 
Pirate CLXXIV. 
CLADOPHORA PELLUCIDA, Kitz. 
Gey. Cuar. Filaments green, jointed, attached, uniform, branched. Frat, 
ageregated granules or zoospores, contained in the articulations, 
having, at some period, a proper ciliary motion. CraporHora (Kiifz.), 
—from kAados, a branch, and popew, to bear. 
Cravornora pellucida; filaments rigid, erect, setaceous, full dark-green, 
di-tri-chotomous ; the axils very acute, the branches erect; arti- 
culations many times longer than broad; dissepiments only at the 
forking of the branches and ramuli. 
CiapopHora pellucida, Avitz. Phyc. Gen. p. 271. 
Conrerva pellucida, Huds. Fl. Ang. p. 601. Dillw. Conf. t. 90. E. Bot. 
t.1716. Ag. Syst. p.120. Harv. in Hook, Br. Fl. vol. ii. p. 357. Harv. 
in Mack. Fl. Hib. part 3. p. 228. Wyatt, Alg. Danm. no. 193. J. Ag. 
Alg. Medit. p.13. Harv. Man. p. 135. 
Has. On the bottoms and sides of deep rock-pools, between tide marks, 
generally near low-water mark ; not left dry at low water. Annual? 
Summer. Not uncommon on the shores of Hngland and Ireland. 
Geoer. Distr. Atlantic shores of Europe and America. Mediterranean Sea. 
Cape of Good Hope, W. H. H. 
Descr. Root scutate, firmly attached to the rock. Filaments from three to six 
or eight inches high, thicker than hogs’ bristle, tufted, or subsolitary, 
extremely rigid, almost wiry, tough and strong, rising with an undivided 
stem to the height of an inch or more, then either forked or trifurcate, and 
afterwards repeatedly branched, at short intervals, in a dichotomous or 
trichotomous manner, some specimens being nearly constantly trichotomous, 
others dichotomous, and others exhibiting a combination of these methods 
of branching. Besides this regular ramification, old and luxuriant. speci- 
mens frequently emit from the forkings, or axils, accessory ramuli more 
slender than the cells they spring from, but branching in the same manner. 
Occasionally these are very numerous and densely tufted. Articulations 
one to each internode of the branches, many times longer than broad, 
cylindrical, filled with dense fluid matter, which is usually dissipated in 
drying, when the plant fades to a pale green, preserving a somewhat glazed 
lustre, like that of Bryopsis. In drying it adheres very imperfectly to 
paper. 
It is pleasant in such a genus as Cladophora, where the species 
often seem to run insensibly into one another, to find one so 
broadly distinguished from the rest that there can be no mistake 
about it. The plant here figured is just of this character. Clado- 
phora pellucida may at once be known by its very distinct 
