— 339 
be free before reaching the base (fig. 262). Moreover, free horizontal shoots arise 
from the lowermost part of the principal axes, usually given off from the lower 
end of the cells. They have the character of rhizomes producing new erect filaments. 
Fig. 263 shows such much-branched rhizomes growing in a bow towards the sub- 
stratum. In the seed- 
lings, too, such hori- 
zontal filaments are 
to be found (fig. 271). 
The  filaments 
as a rule terminate 
without hyaline hairs. 
This character is so 
constant that it can be 
used to distinguish 
this species from Call. 
corymbosum. It must, 
however, be admitted 
that hairs may occur 
in rare cases in genuine 
specimens of C. Fur- 
cellarie (YV, Hatter- 
barn, Sa (Fig. 266); 
D, Ks and UV, Sb). 
The hairs were much 
less numerous and 
feebler developed than 
in C. corymbosum, only 
12—140 w long and 
3,5 u broad in no. 7380 
(YV). The specimens 
in question were col- 
lected in May to Junein 
Callithamnion Furcellarie. Tetrasporangia. A, showing their arrangement, plant 
depths of11—15meters. from northern Kattegat (TP). B—G showing the varying arrangement of the spores 
in the sporangium. A 160:1. B—G 220:1. 
The cells al- 
ways contain a single 
nucleus and numerous long, narrow, more or less curved chromatophores (fig. 264). 
In specimens conserved in alcohol curious fusions between cells in the older 
parts of the plants were observed (fig. 264). The transverse wall was dissolved to a 
greater extent in the periphery and the two cells thus connected by a broad bridge 
of protoplasma, much broader than the central pit connecting the two cells. This 
fusion is not followed by any formation of pit-membrane and may be compared 
with the cell-fusions by the Corallinaceæ and Squamariacee, but they take place 
