1896] PROCARP AND CYSTOCARP OF PTILOTA 369 
in this organ beyond a slight granular structure. However, the 
writer did find occasionally a body in the narrower portion of 
the trichogyne that had something of the appearance of a very 
small nucleus. There was a tendency toward a differentiation 
of the cell-wall around the procarps, manifest in the manner in 
which the upper portions of the trichogyne arose from a sort of 
collar, but the writer observed nothing that could be compared 
with the complex cell-wall of P. serrata. 
No antherozoids were found attached to the trichogynes, 
and as yet no antheridial plants of this Pacific coast species have 
been found. However, the writer did not make the same deter- 
mined search for male plants in this species as he did in the case 
of P. serrata. 
DEVELOPMENT OF THE CYSTOCARP. 
There is a perfect agreement in the structure of the cysto- 
carp of P. serrata and the two torms we are considering. Not 
only do the lobes of the favella arise in the same manner, but 
they are developed from the same cell in both cases, this cell 
being the second cell of the cystocarp. 
There does not appear to be the same uniformity as to the 
Position of the carpogenous cell in P. plwmosa and its var. filicina 
as in P. serrata. Out of thirty-five specimens of cystocarps 
examined, twenty-nine were developed from the basal cell of the 
Pair of Procarps on the outside of'the group, the homologue of 
the Carpogenous cell of P. serrata; four cystocarps came from 
the basal cell of the procarp on the inside of the group, and in 
two instances they had arisen from the terminal segment of the 
Procarpic branch. 
_ three figures of different stages of the cystocarps have been 
wmtoduced, which make clear certain points about their develop- 
ment that are not shown in the illustrations of P. serrata. In 
Fg. 23 we have an instance where the carpogenous cell (¢) of 
~ Procarp on the inside of a group has pushed out towards the 
“enter and contains two nuclei. This the writer considers to = 
the earliest stage in the development of a cystocarp. The dis- 
