206 BRITISH MARINE ALG. 
which, in the living state, when gathered fresh from the sea, glisten like 
strings of glass beads of the most lovely carmine or sometimes even a 
brilliant crimson. Fig. 191 represents an enlarged portion of a branch of 
this fine species. The fronds are tufted, and are repeatedly branched, 
the lower articulations being much longer than broad, the upper ones 
gradually shortening, giving to the terminal tufts of the plant the 
peculiar and distinctly beaded appearance which has suggested the specific 
name of corallina. This species is rather rare, but is taken in several 
situations on the south coast of Devon, in the Isle of Wight, and in the 
Channel Islands. The tetrasporie fruit is produced in whorls round 
the joints ; favellze are placed on the 
upper sides of the branchlets just below 
the joints, and are accompanied by a 
few short involucral ramuli. The 
colour of this delicate plant is so 
fugitive, that it is only possible to 
preserve even a vestige of its lovely 
tint by keeping it in sea water, and 
hidden from the light, until it is laid 
out on paper, and then pressure must be 
applied very gradually, or the beautiful 
coral-like structure of the joints of the 
stems and branches will be utterly de- 
stroyed. Griffithsia setacea (Fig. 192), - 
or the bristle-pointed Griffithsia, is 
found on various parts of the British 
coasts, and is particularly fine in the 
Channel Islands. This species is peren- 
nial. Fig. 192 represents a fruited 
branch which I took this summer 
(1873) from a large plant of the species 
growing in a shaded rock pool in Tor- 
bay. The season before, the branches 
of this same plant were all barren. I 
watched the growth of this particular Fig. 191. Grifithsia coraitina, favelles 
plant with the deepest interest, for se at Che foiits, = 4 i 
it is usually an inhabitant of deep é 
water, and I take this opportunity of recording what is certainly, I think, 
a very remarkable circumstance—viz., the presence of a deep-water species 
in a rock pool near high-water mark; luxuriant, yet barren, one season, 
‘and still more luxuriant, and producing fruit in abundance the following 
season. The fronds of this species are from 4in. to 8in. long, very rigid, 
erect, and bristle-like, each filament tapering to a fine point. The joints 
are cylindrical, and are several times longer than broad. ‘The involucres 
containing tetraspores are produced on the sides of the branches, being, 
in fact, transformations of some of the lateral ramuli. They are suspended 
e>! => Sat se, 
sa : 
s 
. SS 2 ey aay oo = = 
i 
Fy 
| 
== 7 
ttl 
t= 
2S 
