36 BOTANICAL GAZETTE [JULY 
cell of the trichophoric apparatus, which is turned towards the — 
neighboring vegetative cell. The trichophoric apparatus consists — 
of four cells with a trichogyne. After fertilization, all the cells 
of the procarp gradually die except the carpogenic cell, which 
increases in size and divides into two cells, of which the upper 
represents a placenta, giving rise to the lobes of the favella, each 
consisting of several spores. Only one trichogyne has been — 
found fertilized in a single procarp. : 
Dr. Farlow,‘ in The Marine Alga of New England, published — 
in 1882, says of G. Bornetiana Farlow: “In the structure of — 
the procarp this species differs considerably from G. corallina as — 
described by Janczewski. There is only one trichogyne instead — 
of two, as in the last named species. The procarp begins by the = 
growth of a hemispherical cell at the upper part of an articula- 
tion. The cell is then divided into two parts by a partition 
parallel to the base. It is from the lower cell thus formed that : 
the involucre is formed, and from the upper arise the carpogenic a | 
cells in the following way: By usually four oblique partitions ~ 
there are formed four external hemispherical cells and a central — 
pyramidal cell with a broad base. By subsequent division of one a 
of the hemispherical cells, generally of the one lying nearest the — 
axis of the plant, there is cut off a cell which divides into three | 
smaller granular cells, the upper of which grows into a tricho- | 
gyne. The spores are formed by the subsequent growth of the 7 
other three hemispherical cells.” : 
As a more detailed account of the development of the cysto- — 
carp in this species seemed desirable, the present study was 
undertaken, the special aim being to learn the method by which — 
the spores arise and the means of transmitting the fertilizing — 
influence from the carpogonium to the cell or cells giving rise to” 
the spores. In the course of the study several interesting resem- — 
blances between this species and G. corallina were observed, — 
which have not been published. 
The work was carried on under the supervision of Professot — 
Geo. F. Atkinson, to whose assistance in tracing genetic con- — 
‘Report U. S. Commission of Fish and Fisheries for 1879. Washington, 1882. 
