144 
BOTANICAL GAZETTE 
[OCTOBER 
haemotoxylin method. As Duranp (7) found in Marchantia, the 
embryo stains much lighter than the surrounding calyptra, and it 
was found that dipping the slides for a short time in an alcoholic 
nia to receptacle 
axis of thallus (solid line); dotted line indi- 
and longitudinal 
cates median through bilateral arche- 
gonium and embryo; fig. 3, median longi- 
tudinal section of mature archegonium; dark 
area about embryo represents space between 
embryo and calyptra; fig. 3, X400. 
solution of Lichtgriin served 
to bring out clearly the deli- 
cate cell walls. This clouds 
the cytoplasm of the cells to 
a slight extent, and is not to 
be recommended when the 
details of cell structure are to 
be studied. 
Archegonium 
The writer has found 
nothing in the development 
of the archegonium differing 
from the account given by 
Haupt (9). It first appears 
when the female receptacle is 
yet quite small, and when the 
sex organ is mature the recep- 
tacle is still a low conical 
structure (fig. 1), surrounded 
by a large number of sterile 
scales (fig. 2). The venter of 
the archegonium is inclined 
somewhat below the horizon- 
tal, the neck curving upward 
more or less to a perpen- 
dicular position among the 
scales. Haupt (9) regards 
these scales as probably pro- 
tective in function. They 
also probably serve in holding 
. 
a film of water about the archegonia, functioning much as do the | 
paraphyses about the sex organs of mosses, resulting in conditions 
which increase the probabilities of fertilization. 
