THE BRYOPHYTES 277 
note the pointed foot which was imbedded in the gametophyte 
(Fig. 200). 
Study young and full-grown sporophytes and note: 
(a) The slender stalk. 
(6) The enlarged capsule. 
(¢) The hood or calyptra which covers the young capsule. Cut- 
ting off and mounting in water the ends of capsules of various ages, 
examine with m.p.and note: 
d) The lid covering the etophyte 
Br) of the capsule. . ee a Leas. Lae 2 fan 
(e) The fringe of teeth a 
at the mouth. How many er 
rows are there? ee 
(/) The spores (best seen i 
with h.p.). ¢ 
ae a structures stat wd 
above described (a—f). St page 
Spor, é as 
357. Discussion. °phyte re 
The leafy moss-plant, Fic. 208. Diagram of Life History 
or gametophyte, is more Oba Moe: 
highly organized than 4”, antheridium; Ar, archegonium; s,sperm; 
e, egg-cell; e’, egg. 
such liverworts as Mar- 
chantia, since the moss has well-differentiated stems and 
leaves. It is also more specialized even than liverworts 
which bear leaves, since the moss stem has a more compli- 
cated structure than that of any leafy liverwort. 
The sporophyté of mosses is more highly developed 
than that of most liverworts and far more so than the 
Marchantia sporophyte. The elevated position of the cap- 
sules and the expansion of the fringe of teeth at the mouth 
of each capsule assist in dispersing the spores. Although 
the sporophyte has some stomata and can do a little photo- 
synthetic work, it must draw its supply of water and min- 
eral matter from the leafy stem out of which it springs. 
