Fertilization of the Floridez. 93 
a 
protoplasm from e, has again closed up as an independent cell 
with abundant contents. x 800. 
Fig. 13, Apex of the procarpial branch witk the fertilized auxiliary cell a, 
from the side. x 800. 
Fig. 14. The same. The fertilized auxiliary cell (a) has separated off 
outwards the central cell of the spore-complex. x 800. 
Fig. 15, The same, further stage of development. The central cell 
separates off successive marginal cells. x 800. 
Figs. 16-19, Dudresnaya purpurifera, J. Ag. 
(Spirit-material.) 
Fig. 16. Carpogonial branch, with the apex bent inwards. From the 
ventral part of the fertilized carpogonium, which is already 
separated off, an ooblastema-thread grows out, and takes a direc- 
tion towards the auxiliary cells, which are formed by the ter- 
minal cells of short side-branches of the carpogonial branch. 
x 800. 
Fig. 17. The same. From the ventral part of the fertilized carpogonium 
two short ooblastema-threads have grown out and have conju- 
gated with certain (one or two) auxiliary cells. One of these 
short filaments pushes out a side-branch (c), which grows out 
into the neighbouring thallus-tissue. x 800. 
Fig. 18. The apex of an ooblastema-thread growing close past an auxi- 
liary cell, which here forms the terminal cell of a special branch, 
x 800. 
Fig. 19. Later stage of development of fig. 18. The growing apex of the 
ooblastema-thread has cut off a joint-cell, and this has entered 
into conjugation with the auxiliary cell. Afterwards the ooblas- 
tema-cell has formed a diverticulum outwards, and separated 
this off as an independent cell for the formation of the spore- 
complex. x 800. 
Figs. 20 and 21. Dudresnaya coccinea, Crouan. 
(Spirit-material.) 
Fig. 20. The apex of an ooblastema-thread has grown close past an auxi- 
liary cell, which here forms a joint-cell in a special branch; the 
separated joint-cell of the ooblastema-thread enters into conju- 
gation with this auxiliary cell, the two neighbouring cells of 
which are also richly filled with protoplasm, 
Fig. 21. A further stage of development. The joint-cell of the ooblas- 
i tema-thread (ec) has formed outwardly an offshoot (c’), which 
fe grows into a side-branch of the ooblastema-thread, and also two 
lateral offshoots (¢,e), which apply themselves to the auxiliary 
cell externally, and grow round it, to give origin afterwards to 
the spore-complex of the cystocarp. x 800. 
Fig. 22. Dumontia filiformis, Grev. 
(Spirit-material.) 
Carpogonial branch, bent into a hook. The formation of the trichogyne 
+ has already commenc:d on the terminal carpogonium. X 800. 
Puate Li. 
* Fig. 23. Calosiphonia finisterre, Crouan. 
a (Treated with picric acid and hematoxylin. ) 
Three-celled carpogonial branch. The lowest cell is much enlarged, like 
