206 ALG. [CHAP. 
Tail, or Turkey-feather Laver of our southern shores 
(Padina pavonia), fig. 152. The fronds, which are 
marked withconcentriclines, 
assume moreor less the form 
of acup. It is most common 
in tropical countries, and in 
our country only to be found 
on the most southern coasts. 
As asample of the Rhodo- 
spermee we could desire no 
more lovely example than 
the Scarlet Plocamium (P- 
camium coccineum), fig. 153, 
which is admired by all visitors to the seaside. The 
frond, which is of a beautiful rosy hue, is much 
divided, and has a de- 
licate feathery appear- 
ance. Another well- 
known species of this 
group is the Chondrus 
crispus, better known by 
its popular title of Car- 
rageen or Irish Moss, 
It is one of the com- 
monest species on all our 
Fic. 153—Plocamium coccineum. coasts, and may often 
be found washed up on 
the beach. Its general form may be seen in the 
illustration (fig. 154), and in colour it varies from 
white, through yellow and greenish, up to a dull 
purple. It contains a large amount of gelatine, and 
when boiled produces a nutritious jelly, which is 
Fic. 152.—Padina pavonia. 
