254 FOUNDATIONS OF BOTANY 
300. Organs for Repro- 
duction. — The fruiting 
organs are to be sought 
on the radiating branching 
filaments and are usually 
produced in great abun- 
dance during the summer. 
Various stages of develop- 
ment may be expected at 
a given time. The anther- 
ozoids are small spheres 
without cilia, non-motile, 
with a thin cell-wall. Look 
for cells in which they are 
formed (antheridia), occur- 
ring in groups at the tips 
of the branches. Compare 
these with the vegetative 
cells. 
301. Spore-Production. 
— Look for spore-producing 
organs in various stages. 
In the young stage at the 
time of fertilization, an- 
therozoids, carried by cur- 
rents of water, may be 
found adhering. Note the 
shape of the tip (trichogyne) 
and the base (carpogonium), 
and find whether there is 
Fic. 187.— Portions of Thallus of a Red Alga any partition separating 
(Chantransia). (Much magnified.) 
them at this stage. Draw 
A, filaments with antheridia,a; B,youngrecep- o;r describe a few later 
tive hair, or trichogyne,t; C and D, successive 
stages in the growth of the clustered fruit, f. stages im development, and 
note the arrangement of 
the spores at maturity. Are they naked or enclosed in any sort of 
envelope? Are they arranged in masses, chains, or otherwise? 
