Ui 
Fig. 218. 
Callithamnion Hookeri. 
Young plants. 145: 1. 
0m 
ever be met with (fig. 217). The pinnule become thinner towards 
the end, but they are not pointed. 
In growing fronds with pinnate ramification, the dividing 
walls are inclined and alternating (figs. 216, 217, comp. Kyrın, 
1. c. fig. 30 c); in the pinnulæ they are transversal. The lateral 
branches, the pinnæ, are branched in the same way as the main 
axis, from the base or so that the first lateral branch of the second 
order is placed on the 24 or 3% article or even higher (fig. 216). 
According to Kyrın (1. c. p. 151), the branches of the second order 
are, when developed, orientated in the same plane as the lateral 
branch and the mother axis, but, when arising, they are placed 
in a plane perpendicular on the named plane, thus to the right 
and to the left, and the later position is arrived at by the turning 
of the lateral branch. My observations are not sufficient to warrant 
or disprove with certainty this statement, but at all events it 
must be said that its validity is not general. The case represented in fig. 216 B is 
in general favourable to the supposition of Kyrın, however, it will be seen that 
there are some irregularities, e.g. in the 5' and the 10 branch from the base; 
and in other cases the plane of ramification of the youngest branched lateral branches 
coincided with that of the mother branch. Deviations from the pinnate ramification” 
Fig. 219. Fig. 220. 
Callithamnion Hookeri. Part of mains axis with cortication. Callithamnion Hookeri. With paraspores. (Frederiks- 
70:1. havn). A 70:1. B 145:1. 
