332 
A number of branches remain unbranched, though consisting of a rather large 
number of cells; such branches occur frequently at the base of the longer axes but 
also near the top (fig. 250). When the ramification has begun, it usually continues 
uninterrupted, each joint bearing a branch. It happens, however, that one or two 
consecutive branchless articles may occur here and there, in particular in the lower- 
most part of the main axis and the branches. The branches of the long shoots are 
always arranged in a spiral, at all events in the upper part of the shoots, and here 
Fig. 250. 
Callithamnion roseum. A, upper end of long shoot. B, shoot with tetrasporangia. 70 : 1. 
the angle of divergence is usually 1/,; the arrangement of the lowermost branches, 
however, is irregular or alternate biseriate. (Comp. L. K. R. 1920). It very rarely 
happens that one joint bears two branches. The filaments are 10,5—14 x broad 
right under the apical cell. They are not usually terminated by a hair, such or- 
gans may, however, occur sometimes (fig. 251, comp. L. K. R. 1911 p. 209); the 
hairs are rather short; they are a little thinner than the end of the filament, about 
7 y thick. i 
The cells contain one nucleus and numerous irregular lengthened chromato- 
phores; numerous starch grains may occur (fig. 252). 
The lower part of the principal filaments is corticated with descending filaments 
