1896. ] Development of Champia. II 
A number of antheridial plants were found during the sum- 
mer, and in one instance the same plant bore both antheridial 
and cystocarpic branches. The antheridia form patches on 
the frond, indefinite in extent and variable in position, some- 
times appearing as caps at the ends of the branches but more 
often as bands around older portions of the frond (fig. 1). The 
structure of the antheridium is somewhat similar to that of 
the genus Lomentaria described by Mr. Webber.?_ The very 
small antherozoids are borne singly on the tips of short fila- 
ments, which arise in branching clusters from the thallus cells. 
Fig. 2 shows three of these clusters and there it may be 
seen that each cluster consists of several short filaments, the 
younger being branches from the older. 
€ must refer at the outset to an interesting point in the 
structure of the older cells of the frond. The young cells at 
the apex of a branch contain only one nucleus but cells some- 
what removed from the growing point are multinucleate. 
This character is very striking and is shown in most of the 
figures (see figs. 2, 7, 9, 14, etc. 
The writer has observed similar conditions in the older cells 
of Several genera of F loridez, for example Callithamnion, 
Griffithsia, Spermothamnion, and Polysiphonia, and in some 
cases, as in the older cells of Griffithsia, the number of nuclei 
fcomes very large indeed. Apparently a multinucleate 
Structure of the older cells of Floridee is likely to prove a 
very general fact, 
Y preparations have shown that the procarpic branch may 
©onsist of two or three cells. It is a small structure (figs. 3 
as 4), and is always attached to one of the large thallus cells. 
. 4rule the thallus cell (¢, in the figures) is joined to one of 
i aperaal filaments, /, that traverse the frond, but this is 
: aways the case, and procarps and young cystocarps have 
pir found quite removed from it. 
trichogyne is a very delicate structure arising from an 
tur mall cell, the carpogonium, c. The whole struc- 
e770 4mall.that.even: under, such high magnification as 
a diameters, it is very difficult to determine the structure 
.» ell contents. There is granular matter in the carpo- 
| nin (fg. 4) that stains rather deeply and may be nuclear 
| Stance, 
| In one Case (fig. 3) a trichogyne was found with what ap- 
| Wi es ca a 
On the antheridia of Lomentaria. Ann. of Bot. 5: 226. 1891. 
