ER 
The tendrils frequently occurring at the ends of the branches have been known 
for a long time. LyNGByE described them (1819) as peculiar to a particular variety 
8, cirrhosa. They were later mentioned 
by J. Acarpx (Flor. Morph. 1879, p. 10) 
and in particular by WILLE (1885, p. 33) 
and HENCKEL (1902, p. 12) who studied 
their development and structure. They arise 
at the ends of branches which become 
long and thin whithout branchlets and are 
twisted, 5 or 6 worms of a screw often 
lying close together. The twisted part of 
the shoot bears a number of short, thick 
branchlets forming a small bush. The 
tendrils may remain free or catch fronds of 
other Algz or of its own. When growing 
on Halidrys siliquosa the tendrils winding 
round branches of the host plant are 
particularly numerous, giving the Cystoclo- 
nium a very solid attachment. Specimens 
with tendrils are met with in all the Danish 
: Fig. 591. 
waters; their occurrence seems to depend Cystoclonium purpureum. A, young plant growing on 
on external conditions. WILLE found them Furcellaria. February. 5:1. B. lower portion of frond. 
: . ag É 2 July. Nat. size. 
in specimens from a locality with fairly 
agitated water, and HEnckEL thought that they might be caused by the contact with 
an algal frond. This can only be decided by experiments. The tendrils have been 
met with, from 1 to 20 metres’ depth. In the 
North Sea and Skagerak, which are much 
agitated, specimens with tendrils frequently 
oceur; but, on the other hand, specimens 
growing on the moles at Hirtshals and at 
Hanstholm where the sea is usually much 
agitated had no tendrils. At the greater depths 
the influence of the waves can only be 
feeble, but the water is here agitated by the 
currents. 
WILLE raises the question whether the 
cluster of small shoots issuing from the 
Fig. 592. 
Cystoclonium purpureum. Creeping shoots with 
haies 2 8 tle but he leaves that undecided (1885, p. 34). 
HENCKEL has never found tendrils having 
the character of stolons, nor have I myself ever found tendrils surviving during the 
winter and giving rise to new individuals next year. 
tendrils might give rise to a new individual, 
