94 
Fig. 24. 
Fig. 25. 
Fig. 28. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Prof. F. Schmitz on the 
an auxiliary cell, but does not function as such. From the 
separated ventral part of the fertilized carpogonium three ooblas- 
tema-threads grow forth and diffuse themselves into the neigh- 
bouring thallus-tissue. x 800. 
Figs. 24-27. Naecaria hypnoides, J. Ag. 
(Material in spirit. ) 
Young carpogonial branch (0, d, e) with incurved apex. Its 
basal eell (6) bears laterally two branch-cells (a), which subse- 
quently develop into auxiliary cells. x 800. 
Later stage of development. The cell d of fig. 24 has formed 
laterally a branch-cell, 7; the cell e has divided itself by an 
oblique transverse wall into the terminal cell g and the joint-cell 
e,so that now the cells bdeg form the uncinately incurved 
carpogonial branch. x 800. 
Further stage of development. The cells d, e, and f have 
repeatedly branched and formed a small-celled hypogynous cell- 
complex. The cell g has become developed into the carpo- 
gonium, and upon this, after fertilization, the trichogyne has 
become separated off from the ventral part. x 800. 
A still later developmental stage. The ventral part of the fertilized 
carpogonium has entered into conjugation with the basal cell (8) 
of the carpogonial branch, and now puts forth an ooblastema- 
thread (c). ¢, remains of the trichogyne, which is here very 
transitory. (The fertilized ovicell also enters into conjugation 
with the auxiliary cells @ in fig. 24 through short processes in a 
very variable manner, after which fresh ooblastema-threads 
originate from the conjugation-cell; these processes, however, 
have been omitted from the figure for the sake of distinctness.) 
x 800. 
Diagram of the cell-division in the procarpium (median longi- 
tudinal section) of Chondria, Polysiphonia, and other Rhodo- 
mele. 
b, cell of the central axis of the procarpial branch; a, un- 
paired marginal cell of this, from which in the first place the 
curved carpogonial branch, e ee c, grows forth as a terminal 
growth, while laterally one or more branch-cells, d, are produced ; 
these sometimes (as in Chondria tenwissima) vamify very abun- 
dantly, and form a complex of short, closely adpressed, sterile 
cell-filaments. ‘The cell aitself subsequently becomes the auxi- 
lary cell, and, after the fertilization of the carpogonium (e), is 
fertilized by the separated ventral part of this carpogonium, 
with which it is in contact at the time of fertilizable maturity. 
From the cell @ the sporigenous filaments then shoot forth, 
while the cell-series e ¢ e, as well as the sterile tuft of filaments 
of the cell d, disappears. 
Figs. 29-83. Chylecladia kalifermis, Hook. 
(Material in spirit.) 
One of the short-jointed cell-filaments, which, meeting at the 
apex, constitute the growing vertex of the branches of the 
thallus. The joint-cells of this cell-filament branch outwards | 
to form the large-celled layer of the wall of the hollow joints 
of the thallus. From the branch-cell of the sixth joint-cell there 
