Cystocarp in Rhodomelaceae (/ 1 ). 195 
of three or four at the distal ends of the gonimoblast filaments. 
In other Rhodomelaceae not more than one or two cells usually 
intervene between the placenta (i.e. the auxiliary cell and its 
absorbed neighbours) and the carpospore. In some cases the 
carpospore would seem to be sessile upon the placenta. In 
Dasya, however, long filaments, sometimes pinnately, some- 
times subdichotomously branched, interpose eight or ten cells 
between the placenta and the nearest spore. This stage of 
the cystocarp is represented in Fig. 7. 
This account of the development of the cystocarp in Dasya 
coccinea will be found to differ considerably from that given 
by Janczewski among a series of observations on the sexual 
reproduction of Florideae (6). This author found the procarp 
to contain, as derivatives of the pericentral cell, a ‘ trichophoric 
apparatus ’ of four cells, and two contiguous ‘ carpogenous ’ 
cells. These ‘carpogenous’ cells are no doubt the rudiments 
* of the sterile branches. In procarps which are left unfertilized 
Janczewski found, however, that these cells divide to form 
a ‘carpogenic system ’ of short filaments directed towards the 
exterior, and constituting the convex portion of the procarp. 
I am at a loss to account for this statement, as I have found 
that in unfertilized procarps the earlier convexity is soon 
lost. Doubtless the cells of the sterile filaments do not die, 
as, according to Janczewski, do the cells of the ‘ trichophore.’ 
I have not, however, detected anything in unfertilized procarps 
corresponding to this description. The writer remarks that 
the limits of the ‘ carpogenous system ’ are not well defined. 
Further, in fertilized procarps the ‘carpogenous’ tissue is said 
to be more vigorous at first, but soon to pass into a condition 
of rest, during which the vegetative force is exclusively em- 
ployed in the formation of the pericarp. The pericarp is 
derived from the two lateral pericentral cells, assisted by 
neighbouring tissue. This supplementary tissue is, as I have 
shown, an internal system of paranematal filaments. After 
the pericarp has attained its definitive aspect, the ‘carpogenous 
system ’ is described as awaking from its sleep, and producing, 
at the expense of its terminal cells, the sporogenous filaments. 
