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Conceptacle
Conceptacles
are specialised cavities of marine and freshwater
algae
that contain the reproductive organs. They are situated in the
receptacle
and open by a small
ostiole
. Conceptacles are present in
Corallinaceae
, and
Hildenbrandiales
, as well as the
brown
Fucales
. In the Fucales there is no
haploid
phase in the reproductive cycle and therefore no
alternation of generations
. The
thallus
is a
sporophyte
. The
diploid
plants produce male (
antheridia
) and female (
oogonia
) gametangia by
meiosis
. The
gametes
are released into the
sea
, after fusion the
zygote
settles and begins growth.
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