327 
poorly developed hairs and some scars after hairs which had fallen off. Similar 
specimens were found in the harbour of Skagen in July, but the ends of the branch- 
es showed sympodial development and sometimes a pit in the end wall at the 
point where the hair had been inserted. The hairs are terminal on the branches the 
development of which is stopped by the formation of the hair, but the hair is often 
pushed aside by a lateral branch formed under it, and such a sympodial develop- 
ment may repeatedly occur on the same branch (fig. 243, comp. L. K. R. 1911, p. 212). 
Not rarely two hairs are to be found on the same terminal cell; the one is then 
terminal, the other lateral (comp. THURET 1878, pl. 33 and 35). The shoots in full 
Fig. 244. Fig. 245. 
Callithamnion corymbosum. Upper Callithamnion corymbosum. À, cortical filaments with adventitious shoots, 
end of shoot of plant collected in B, part of plant with stoloniform filaments partly ending with hapters. 
December; the young branches B 50:1. 
are hairless and incurved over 
the top. 270 :1. 
growth do not terminate with a hair but only the shoots with feebler or ceasing 
intensity of growth. In autumn the hairs are shed, and in the specimens found in 
December and January the hairless branches are curved in over the summit of 
the shoot (fig. 244). 
The main axes increase gradually in thickness downwards and are in the 
lower part provided with a cortex of decurrent filaments. The cells issuing from the 
bases of the branches and growing in the outer wall of the joint cells of these 
filaments contain several nuclei. Small adventitious shoots may issue from them 
(fig. 245 A). 
In specimens from the harbour of Kerteminde numerous free filaments were 
found issuing from the lower end of the cells of the crect filaments and growing 
out in a direction perpendicular to these filaments; they consisted of long cells and 
42° 
