in Gracilaria confervoides , Grev. 215 
In Fig. 1 is shown a median vertical section of one of these 
swellings made at right angles to the axis of the branch bear- 
ing it. There is no fruit-cavity at this stage, its region of origin 
is indicated by the curved dotted line /. c. At this point the 
cell-walls are much swollen, and the cells exhibit a tendency 
to separate from one another. Outside of f. c. the fruit-sheath, 
f.s., is seen. Beneath f.c. the group of yellowish cells men- 
tioned by Thuret and Bornet is found, p\ / 2 , / 3 , / 4 , / 5 > c. At 
an earlier stage in the development a single cell occupies the 
place of these six cells, which will be shown later to form part 
of the procarpium. Right and left of them come the placental 
cells, p.c. No trace of a trichogyne is visible, nor is there any 
sign of the pore. The fruit-cavity arises schizogenetically by 
the separation, owing to the splitting of their party-wall, of the 
two layers of cells outside and inside of the curved dotted 
line f.c. (Compare origin of conceptacles of Fucus^i) The 
layer of cells beneath f.c. forms the most superficial part 
of the placenta,, and the apical part of the procarpium. 
Fig. 2 represents an older swelling. The section shown in 
this figure was made parallel with, instead of at right angles to, 
the long axis of the branch. The fruit-cavity,/', c . has begun 
to form. The placental cells, p.c., are shown, as well as several 
cells of the procarpium,/, /, c.c., from one of which, c.c., a dis- 
tinct filament, t, passes in a nearly straight line for some 
distance, then dips beneath some of the cells of the fruit- 
sheath, being almost lost to view in its winding course until it 
reappears as a small papilla, t\ at the bottom of a conical de- 
pression on the surface of the apex of the swelling. I believe 
t, t 1 is the trichogyne, and that the procarpium figured here is 
at the stage when it is just ready for fertilisation. In this 
case, as in others, the procarpial cells, before fertilisation has 
taken place, are densely filled with finely granular protoplasm, 
with nuclei and leucoplastids. 
Fig. 3 shows a part of a larger procarpium, the plane of sec- 
tion being the same as that of Fig. 2. Three or four cells of 
1 F. O. Bower, Conceptacles of Fucus in Q. J. M. S. 1880. 
