219 
determined by the intensity of the light. In the Danish waters the hairs were con- 
stantly met with in July and August and were also observed in September. 
Ramification. The most common mode of ramification of the frond is 
lateral, the branches arising at er 
some distance from the tip, in | | 
the young furrows, exactly at 
the level of the diaphragms or | 
a little higher. One, two or 
three, or rarely more branches 
may arise in the same furrow, 
and the branches are there- 
fore often verticillate, but the 
branches of the same furrow 
do not arise simultaneously. 
The development of these 
branches is altogether acrope- 
talous, but some furrows re- 
main branchless, especially in 
the branches. According to 
DeEBRAY (1886, p. 15), the 
branches “proviennent des cel- 
lules du diaphragme adhérentes 
à la couche corticale. Si la 
paroi présente plusieurs assises 
de cellules, les petites cellules 
extérieures sont soulevées et 
séparées les unes des autres 
par le bourgeon se formant 
au-dessous d'elles”. It is, how- 
ever, not obvious from the des- 
cription of DEBRAY, which is not 
illustrated by drawings, whether 
it refers to Ch. Kaliformis or 107,04 4 
to a related species. At any CH. dthea fel || 
rate, my obervations, which are, Fig. 575. 
however, not very thorough, do Chylocladia kaliformis. Dried specimen with cyslocarps dredged by the 
i . à late Professor C. H. Ostenfeld, North of Hirsholmene. August. Photo, 
not agree with that of DEBRAY. Reste 
True, the branches often arise 
exactly in the middle of the furrow. at the level of the diaphragm, but other branches are 
evidently placed at a little distance above this level, and an origin like that postulated 
by DEBray is consequently precluded. My observations seem to accord better with 
the assumption that the branches take rise from divisions of superficial cells (fig. 574). 
74* 
