1896 J PROCARP AND CYSTOCARP OF PTILOTA 371 
cell of which is the carpogenous cell. Often this segment from 
which the procarp is developed gives rise to one or two cells 
that are ordinarily vegetative, but that sometimes become 
changed into procarps. When this is the case a group of pro- 
carps results somewhat resembling the group in Ptilota. The 
cystocarp consists of several lobes, but unlike Ptilota they all 
arise directly from the carpogenous cell. 
In the genus Ceramium, according to Janczewski, there are 
found two procarps connected with one carpogenous cell. In 
Ptilota the pair of procarps situated at the outside of the group 
appears to have but one carpogenous cell. However, the man- 
ner in which the procarps of Ceramium develop is quite different 
from that of Ptilota, and a morphological relationship seems 
very unlikely. . 
REMARKS ON THE CHARACTER OF THIS TYPE OF CARPOSPORIC 
REPRODUCTION. 
Physiologically considered there is a great resemblance 
between the type of carposporic reproduction of Ptilota and of 
the several genera previously mentioned. They all agree in that 
the Carpogenous cell is separated from the trichogyne by a 
trichophoric apparatus consisting of one or more cells. This 
characteristic of the type is very important from a physiological 
standpoint, and so considered it matters little what is the precise 
number and arrangement of the cells of the trichophoric appa- 
ratus. Furthermore, if the writer is not mistaken in his inter- 
pretation of what has been published by the different writers on 
the subject, in the genera above named and also in the case of the 
Species of Ptilota studied by him, no actual fusion of the base 
of the trichogyne with the carpogenous cell has been observed. 
In most of these genera and also in Ptilota the trichogyne 15 S° 
far removed from the carpogenous cell that fusion would hardly 
be possible, except through the agency of an ooblastema fila- 
ment. However, in spite of very careful search on my part no 
ao filament could be found in Ptilota, nor have I seen in the 
literature any figure showing an ooblastema filament or any 
