88 A LABORATORY MANUAL OF BOTANY 
bear any resemblance to an alga, or to the pro- 
tonema of a moss? 
b. Cases where the body is beginning to be a flat- 
tened structure. In what directions do cells 
divide in order to produce this structure? 
From what cells do the rhizoids arise? Does 
the body bear any resemblance to a liverwort 
gametophyte? 
c. A fully formed gametophyte. Make a general 
sketch showing its form and parts. 
2. Reproduction (sexual). 
a. Antheridium and sperms.——On the under side 
and margin of younger as well as fully formed 
gametophytes the antheridia may be seen as 
conical projections from the surface. They 
are best studied when they are mounted, so 
that a side view is obtained. Note the wall- 
cells and the centrally placed region in which 
sperms are formed. Draw. 
With fresh material it is usually easy to 
find antheridia from which sperms are escap- 
ing. If you can make such a mount, note the 
form of the sperms, and how and where they 
escape. Are there many in each antheridi- 
um? Are there more than are needed? 
b. Archegonia and eggs.—On the under side of the 
gametophyte, nearer the apical region than the 
antheridia, are the archegonia. Only the 
necks extend beyond the surface of the gam- 
etophyte, the ventral pai. of the achegonium 
being embedded. It may be possible to 
mount the material you have so as to see the 
protruding necks. If so, do you see sperms 
trying to gain entrance to the archegonia? 
What advantage in having the archegonial 
