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Antheridium
An
antheridium
or antherida (plural:
antheridia
) is a
haploid
structure or organ producing and containing male
gametes
(called
antherozoids
or
sperm
). It is present in the
gametophyte
phase of
cryptogams
like
bryophytes
and
ferns
, and also in the primitive vascular
psilotophytes
. Many
algae
and some
fungi
, for example
ascomycetes
and
water moulds
, also have antheridia during their
reproductive
stages.
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