RHODOSPERME. 157 
two or three principal sections, with very crowded branches, which expand 
in a fan-like manner, and are prettily crested at the tips. The colour is 
a fine rose red, that of the tubercles is much darker and the plant when 
-young generally adheres very well to paper. 
Rhodophyllis (formerly Rhodymenia) bifida, is a rare summer annual, 
which grows on rocks in the sea, but is usually a deep-water plant, hence 
the difficulty in obtaining specimens in good condition. It is found 
on most of the British shores, though rather rarely in Scotland. The 
fronds are tufted and very densely branched. In barren specimens the 
segments are usually wide and not so deeply cleft at the margins and tips 
as those which produce fruit. The tubercles are globular, and are either 
seated on the margins or are sometimes dispersed over the surface of the 
upper divisions of the frond. Tetraspores are produced in little cloud-like 
Fie. 145. Plocamiwm coccinewm. 
spots within the margins, or scattered near the tips of the upper lobes. 
Fig. 144 represents the two varieties I have just described. Var. ciliata, 
as described by Dr. Harvey, is now raised to the rank of a species, under 
the name of Rhodophyllis appendiculata. The margins of the frond of 
this plant are fringed with little leaf-like processes or cilia, and in these 
the tetraspores are placed. The colour of these plants is a fine pink or 
rose-red ; and although when taken from the water they are like bunches 
of crisp leaves, they soon become soft and flaccid, and adhere very well 
to paper. 
The genus Plocamiwm is represented by some of its species or varieties 
in both hemispheres. Our own beautiful and well-known Plocamium 
coccineum, dear to amateur algologists and seaweed picture makers, 
is well represented at Fig. 145. This is the commonest and certainly one 
