358 BOTANICAL GAZETTE [| NOVEMBER 
we are justified in laying emphasis upon it for the new terminal 
cell (fig. 3, cell 11) now developed immediately into a procarp. 
Therefore the segment 10 (fig. 2) may be said to termi- 
nate the procarpic branch, although really its axis continues 
through this procarp and only ends with its trichogyne. This 
procarp is the inner one of the group of procarps, the one 
nearest the pinna, and in all figures it has been numbered 11. 
The development of this individual procarp may be taken 
as the type for all. The cell that gives rise to it (fig. 3, cell 
II) divides transversely. The upper cell then elongates and also 
divides, and the terminal division becomes specialized into the 
trichogyne. The different stages in the development of this 
procarp are illustrated as follows. A two-celled stage is shown 
in fig. 6, no. 11, and the same condition appears again in figs. 7 
and 8, except that in both cases the upper cell is much elongated 
Preparatory to the development of the trichogyne. A half 
grown trichogyne appears in fig. g (numbered 11!) and the — 
mature procarp is shown in fig. zo. It must be apparent that the 
position of this procarp, whether to the right or left of the center 
of the group, depends upon the side from which the procartple 
branch is viewed. Its situation is always on the inside of the 
group, that is the side nearest the axis of the pinna. Itis evident 
that the procarp follows the same type of growth as other parts 
of the frond. That is, the growth is from the terminal cell, and 
the structure is ashort branch of three cells, one of which 
becomes specialized into the trichogyne. The number of cells 
in the different procarps varies, but the method of development 
is the same in all. 
€ may now consider the peculiar pair of procatps . 
the outside of the group. Beginning with the stage -_ 
Jig. 3, we see that a cell (no. 10’) has been cut off from 7 
terminal segment of the procarpic branch. This cell quie : 
develops into a short branch, usually of four cells, which curve 
inwards somewhat as is shown in the later stage (fig: 4): 
cells of this branch are short and thick and lie closely P , 
against one another. The terminal cell eventually becom : 
ressed 
