Fig. 213. 
Trailliella intricata. 
of filaments. 300 :1. 
are frequently curved a little upwards between the 
hapters; they usually bear near the hapters a number 
GAY 
Fig. 215. 
Trailliella intricata. Terminal 
hapters. 82:1. 
Upper ends 
306 
staining agents in the apical cell and the young segment 
cells (fig. 213). As shown by Barrers and KyLIN, the cells 
contain numerous disc-shaped, or elongated chromatophores. 
The fully developed cells contain numerous starch-grains. 
The pits connecting the cells are very distinct. Most of 
the articular cells bear at their upper end a small gland 
cell, in optical section triangular, seen from the face 
roundish. As shown by KyLiN (Il. ce.) they contain a sub- 
stance which by addition of hydrochloric acid produces 
iodine. 
The horizontal filaments are fixed to the substratum 
through pluricellular hapters, consisting of a downward 
tapering cell which at its 
under end bears a whorl 
ofrepeatedly branched fila- 
ments closely connate in 
a conical attachment disc 
(fig. 214). The rhizomes 
of branches which are partly 
horizontal partly upright. 
The upright filaments 
are sparsely and irregularly 
branched; there may be two 
generations of branches. The 
Fig. 214. 
Trailliella intricata. 
with hapter. 
Creeping filament 
260 : 1. 
branches are scattered; they arise a little below the upper | 
end of the filaments and are cut off by a watch-glas-shaped 
wall (fig. 213). The filaments are of almost equal thickness 
in their whole length, only a little tapering at their upper 
end; the diameter is 25—38 u, the length of the cells 1—2,5 
times as long as the diameter, more rarely up to 3 times as 
long. The long cells are a little constricted at the transversal 
walls. Hapters may exceptionally be found terminal on the 
filaments (fig. 215). 
The arrangement of the gland cells is irregular; in the 
horizontal filaments they are particularly produced on the 
upper convex side. In the upright filaments they have a ten- 
dency to be alternating, but no regularity exists and some 
cells bear no gland cell (comp. Kyrın 1915). 
The plant has always been found sterile in the Danish waters till October 
1922 when Mr. C. A. JØRGENSEN found tetrasporiferous specimens in two localities 
