large cortical cells originally contain one nucleus, later a greater number (comp. 
KyLiN 1923, p. 39), and numerous very small chromatophores, situated at the outer 
| 
Fig. 573. 
Chylocladia kaliformis. Tip of frond with 
hairs. 195 : 1. 
wall or at the anticlinal walls, or even at the inner 
wall of the cells; they are orbicular or shortly rod- 
shaped, often arranged in curved rows. The refractive 
bodies observed by BERTHOLD (1882, p. 690) in the large 
cortical cells in specimens growing in sunny localities 
at Naples, were not met with in the Danish waters, 
but that is undoubtedly due to the fact that the 
species here is exposed to a much smaller intensity 
of light; it always occurs in rather deep water 
(7—18 m), the sea-water is much more troubled here 
than usually in the Mediterranean, and the sunlight 
does not penetrate so deeply, owing to the smaller 
height of the sun. The blue iridescent gloss of the 
plant described by BERTHOLD I have never seen; nor 
does it seem to have 
been observed at the 
coasts of the British 
Islands. The colour of 
the living plants col- 
lected in July and Au- 
gustis bright pink, often 
yellowish or greenish. 
A greenish plant took 
a bright pink colour in 
drying. 
The younger por- 
tions of the frond usu- 
ally bear numerous 
vigorous hyaline hairs produced by some of the small 
cortical cells. They arise as outgrowths from these, 
cut off by a transverse wall (comp. Kyrın 1923, p. 38, 
fig. 27 d); in a young stage they contain abundant 
protoplasm and a single nucleus. A number of these 
young hair-cells may remain in the juvenile stage, while 
others grow out early as long hairs of the usual structure 
(figs. 572, 573). The hairs are very thick, about 9—11 x, 
and may reach a length of 1 mm or more. It probably 
depends on outer conditions whether the hair-cells 
grow out or remain rudimentary. Comp. BERTHOLD 
(1882, p.692), who found that their occurrence is largely 
A 
Fig. 574. 
Chylocladia kaliformis. A, portion of 
frond with adventitious shoots at the 
constrictions. above two shoots above 
the constriction, below a shoot below 
the constriction and to the left a quite 
young shoot exactly in the constriction. 
63:1. B, the last-named shoot 200: 1. 
C. young shoot over the constriction 
200 : 1. 
