368 BOTANICAL GAZETTE [NOVEMBER 
parison of fig. 22 with fg. 7 will show that the two groups of 
procarps are identical in all the essentials of structure. There 
was no tendency towards an increase of the typical number of 
procarps in the Californian plants, but frequently the full num- 
ber was not present. 
The appearance of the pair of procarps on the outside of the 
group requires a word of notice. The second procarp of the 
pair is sometimes very small, and its position such that the ques- 
tion might arise as to whether it really is a filament or a number 
of cells cut off from the basal cell by radial divisions (fig. 27). 
In several such cases, specimens were treated with lactic acid 
and ammonia, when by carefully crushing the specimen and 
manipulating the cover glass, the two procarps were separated 
at all points excepting where the second joined the first at the 
basal cell. After such treatment it was apparent that the two 
procarps were distinct branches. 
A very exceptional case was observed in the presence ofa single 
procarp on the frond near the base of a pinnule, and in no way 
connected with a procarpic branch. It was attached to one of 
the lateral branches of a pinnule of P. plwmosa, and consisted of 
three cells, the trichogyne projecting beyond the edge of the 
pinnule. This was the only exception noted to the rule that in 
the genus Pulota the procarps are borne at the ends of procarpie 
branches. 
MINUTE STRUCTURE OF THE PROCARPS. 
With the general agreement in structure that we have found 
to exist between the different portions of the frond of the Cali- 
fornia plants and P. serrata, we should hardly expect to find 
great differences in the minute structure of the procarps. There 
are no essential differences in the structure of the carpogeno’ 
cells and the trichophoric apparatus. The trichogynes of fe 
plumosa and P. plumosa filicina are somewhat longer than 1 
P. serrata, measuring about 62 p long and 3 wide above the — 
trichophore. In most cases it was quite impossible, 
fully staining, to make out any differentiation of the protoplasm - 
after care 
