THE BRYOPHYTES 269 
845. Minute Structure of the Male Receptacle and Antheridia. — 
Make thin vertical radial sections (in pith) of a male receptacle and 
examine with l.p. and m.p.! p 
Note: Z 
(a) The flask-shaped 
cavities in which the an- 
theridia are borne. Where 
do they open ? : 
(6) The antheridia of 
various ages, each with a 
stalk bearing a sperm-case. 
(c) In water in which a 
fresh male receptacle has c-4¢4 
been left for a short time 
look with l.p. for moving 
sperms. Kill them with 
iodine, run water under the 
edge of the cover-glass, 
study, and draw. Or crush 
a mature antheridium from 
preserved material and Pees ea. Rees 
study: the aE ssa : Receptacle of Mar- 
346. Minute Structureof — apantia (lengthwise 
the Female Receptacle and section, consider- 
Archegonia.— Cut thin ra- ably magnified). 
dial vertical sections (in c, canal in neck of archegonium; e, egg in 
pith)of young female recep- —_archegonium; p, breathing pore; chi, cells, 
tacles, making the sections in air-chamber, containing chlorophyll; J, 
pass through the portions lobe of the receptacle; s, fringed appendages 
of receptacle. 
between the rays, or arms. 
If possible use also prepared slides of microtome sections. Examine 
with m.p. and note: 
(a) The archegonia of various ages. Where are the youngest? 
(6) The parts of an archegonium, —a short, stout stalk, an en- 
larged body, or venter, and a slender neck. Draw. 
(c) Inside of the venter in the older archegonia an egg. Draw. 
1 Prepared slides of microtome sections will show the relative positions of 
the parts more clearly. 
