Lichens -
These
are
examples
of
symbiosis
of
algae
with
fungi.
A
lichen
is
a
composite
organism,
consisting
of
a
specific
fungus,
usually
an
ascomycete,
living
in
association
with
one
or
sometimes
two
species
of
algae
or
blue
green
bacteria.
The
symbionts
form
a
vegetative
body,
or
thallus
There
are
three
morphological
types
of
lichen
thalli,
crustose,
adhering
closely
to
the
substrates
(rock,
tree
bark),
foliose,
leaf
like
and
more
loosely
attached
to
substrate,
and
the
fruticose,
forming
pendulous
strands
or
upright
stalks.
The
bulk
of
thallus
is
made
up
of
fungal
hyphae.
