409 
1) Te3e5e4e2e3e3e17b3b45b4b4b3b5b10b3 5 
9) 8e7e17b6b8b3b3b3b3b4b2b2b2b 
3) 10b513b2b413b3b4b3b 
4) 10D5D3D2b3b3d3d3182d14141414141814 
5) ...b5b5(D483b3b38243d242418714218281(%)24141414 
6)... OLM2O02b1O2O2O1O1 O21 M11 M1111 (0112/02 (01911111 11411 
Schemes of branches of Polysiphonia urceolata. The figures signify the numbers of joints between 
the consecutive lateral organs. e endogenous branches; b ordinary exogenous branches; I trichoblasts; 
(t) basal cells of shed trichoblasts; g male trichoblasts; + tetrasporangia, the sign denotes the joint 
in which the sporangium is seated. ... designates that the base of the branch was not observed. 1)—3) 
branches of male plant from Frederikshavn April. In 1) the basal portion of the branch is procumbent; 
from * the shoot is erect. The endogenous branches were feebly developed. Always a divergence of 1/4. 
4) and 5) from Store Middelgrund (Ke) May. 6) from Hirshals July. 
The young segments of the shoots are lower than in the other 
Danish species, but the segments producing branches are higher and 
cut off by more inclined walls (fig. 344). 
The antheridia cover the greater part of unbranched trichoblasts; 
these organs have a short two-celled stalk and terminate with a sterile 
filament composed of a small number of cells, most frequently three. 
A sterile branch does not occur in the antheridia-bearing trichoblasts, 
but I have once met with a male trichoblast bearing a fertile SEES 
3 Polysiphonia urceo- 
branch corresponding to the first branch fate. Tip of shoot 
in the sterile trichoblasts (fig.345). The male ner 
trichoblasts are densely crowded in corym- segment is higher 
biform clusters at the tip of the shoots, a an 
each segment often bearing one trichoblast.  auce a branch. 
The male trichoblasts often appear sudden- SEL 
ly without foregoing sterile trichoblasts. 
The procarps arise as in the other species in the 
second joint of the female trichoblasts, the upper part of 
which takes the shape of a sterile trichoblast. The third 
joint remains short and undivided and the first sterile 
branch is given off from the 4th joint, usually to the 
right (fig. 346). Of 33 examined female trichoblasts 26 
bore the first sterile branch on the right side, 7 on the 
left. A cystocarp with its ostiole protracted in a cylin- 
drical neck is shown in fig. 247. A remnant of the sterile 
part of the trichoblast may sometimes be found on the 
fully developed cystocarp. 
Fig. 345. The arrangement of the tetrasporangia differs accord- 
Polysiphonia urceolata. Male ing to whether the filament bears trichoblasts or not. In 
trichoblasts, anormal, b branched. 2 2 ~ 
124 : 1. the latter case the sporangia are seriate and the filament 
Fig. 344. 
