214 BOTANICAL GAZETTE [SEPTEMBER 
are the same as those organs of Haplospora, however similar the type. 
We do not know of female organs, but we may foresee that they 
would have the form of plurilocular sporangia with a median cavity 
and a separate dehiscence for each little cell. Similarly one may 
foresee that the antheridia of Acinetospora will be provided witha 
median cavity and that the dehiscence will be common and terminal. 
The Tilopteridacee have no affinity with the Fucacez with which 
they have often been placed in the classical works. On the contrary 
they approach very closely the Ectocarpacee and Cutleriacee. They 
may be divided into two tribes, the ACINETOSPORE# (genus Acineto- 
spora), more closely related to the first ; and the HAPLOSPORE# (genera 
Tilopteris and Haplospora), more closely related to the second. 
When these plants shall show us organs that are as yet unknown We 
_ shall without doubt have to raise the preceding tribes to the rank of 
families, the Acinetosporacee and Haplosporacee. I have shown in 
the table below a way in which the affinities of these plants may be 
represented.—CaMILLE SAUVAGEAU, Dijon, France. 
Ectocarpus 
fronds monosiphonic 
_—— 
Choristocarpus Acinetospora 
ous 
propagula exogenou propagula endogen 
pet from an stn cell. growth tric chothallic. 
Antheridia with Tilopteris 
a central cavity 20, 
ogee from Haplospora 
ase 
Cutleriacee 
Sphacelariacee —— 
