432 
they increase in number but decrease again in the fertile region, in particular in the 
tetrasporiferous and male plants. In the upper part of the plant two or three or even 
more branch-bearing joints may follow consecutively; on the other hand, the number 
of fieneent branchless joints may vary from one to many. The basal cell of the 
Ve 
originally branchless trichoblasts frequently later on gives rise . 
to a secondary shoot which, however, as a rule attains only 
a small size. As examples some diagrams of shoots may here 
be presented: ¢ signifies a trichoblast without primary branch, 
r a primary branch, s a secondary branch, (é) a basal cell 
of a shed trichoblast, ¢ a male trichoblast. 
long shoot: sssssssss((Orrsrsr@OOrt@Orttrttrrrrir 
tetrasporiferous plant: rsrrHOrOOrOrOrOrOOrOoOMrt 
similar: ...f¢rtttrtttttttt 
male plant: .. {trtttrttértété à 
Fig. 379 similar: ...{trtté gr 
Polysiphonia Brodiei. Basal . 2 
Horton ot branch “showing The first lateral organ (trichoblast) of the branches is 
the pil connectingthecentral usually in the Danish specimens placed on the second joint; 
cell ofthe basal joint with the 
vest of the trichoblast. 390:1 in Specimens from Cherbourg, Kny found it on the second 
to the fifth joint. 
As in most other species of the genus the antheridia are produced in the 
main axis of the trichoblasts except the two lowermost joints. At the right hand the 
upper of these cells bears a sterile branch which projects more than the antheridial 
body and may thus protect it. A sterile cell does not occur at the 
top of the full-grown antheridial body. 
The carpogoniferous trichoblasts frequently show a curious 
aberration, some of the cells of their primary axis bearing two 
branchlets each (cp. K. R. 1903 p. 444). The fertile trichoblast 
shown in fig. 380 bears two branchlets on the fourth joint to the 
right and two on the fifth joint to the left. In other cases one 
joint only (the fourth) bears two branchlets, and in one case 
the 3rd joint, which normally bears no branch, bore one branch 
on the left side, the 4th two branchlets on the right side, the 5th 
one branchlet on the left side. The second joint of the female 
trichoblasts may even in rare cases bear a branch; such cases are 
shown in fig. 381. In fig. A the second, fertile, joint and the fourth 
bear each a branch to the right, the third bears no branch. In 
fig. Bthe second joint bears a branch to the right, the third one 
to the left and the fourth one to the right. In the latter case the 
first joint of branch 2 bears no branch as if it were a basal 
cell of a trichoblast; its second joint bears two branchlets. 
Branch 3 bears two branchlets on its first joint. In all cases where 
a joint bears two branchlets, the last-formed branchlet is placed 
NG 7 
Ve 
Fig. 380. 
Polysiphonia Brodiei. 
Young female tricho- 
blast. 220:1. 
