RHODOSPERME. 101 
states of this species are widely different. This plant, like the foregoing, 
is perennial. As winter approaches, 
the tufted branches which clothe 
the fronds throughout, fall away, 
leaving the stems of the plant rigid 
and bare; but, on the return of 
spring, a series of beautiful tufts of 
pencilled filaments, or ramuli, shoot 
forth from the branches, and on 
these, little berry-like capsules are 
produced. The summer tetraspores 
are contained in winged branchlets ; 
those which appear in winter are 
produced in curious tufted pods 
called Stichidia, as _ represented, 
highly magnified, at Fig. 95. 
Odonthalia dentata, or ‘‘ toothed 
sea-branch,’”’ is another of our 
northern species of algz, and one 
so distinctly marked that there is no 
possibility of mistaking it for any- 
thing else. It is abundant in 
Scotland, in the north of Ireland, 
and in the Isle of Man. I have 
taken it very frequently near that 
well-known fishing station called 
Fie. 94, Rhodomela lycopodioides. Cullercoats, north of the Tyne, but 
I have never had the good fortune to meet with a fruited speci- 
men. 
The fructification of this 
species is curious and beau- 
tiful. Ceramidia are pro- 
duced from the axils of the 
branches in tufts on a 
delicate little pedicel or 
stalk, and in the same 
situations, on other indi- 
viduals, lanceolate pods or 
stichidia, also tufted and 
stalked, contain a double 
row of tetraspores, form- 
ing a most beautiful micro- 
scopic object. 
Fig. 96 represents a 
Fie. 95. (a) Stichidia with tetraspores of Rhodomela branch of Odonthalia, and 
subfusca, (b) Tetraspore magnified. Pedaae) savas tutte 
the pretty bell-shaped ceramidia, containing spores. The colour of 
