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Definition of lichen
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of lichen is as below...
Lichen
(n.) One of a class of
cellular,
flowerless
plants,
(technically
called
Lichenes),
having
no
distinction
of leaf and stem,
usually
of
scaly,
expanded,
frond-like
forms,
but
sometimes
erect or
pendulous
and
variously
branched.
They
derive
their
nourishment
from the air, and
generate
by means of
spores.
The
species
are very
widely
distributed,
and form
irregular
spots or
patches,
usually
of a
greenish
or
yellowish
color,
upon
rocks,
trees,
and
various
bodies,
to which they
adhere
with great
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Lirella
::
Lirella
(n.) A
linear
apothecium
furrowed
along the
middle;
the fruit of
certain
lichens.
Excipulum
::
Excipulum
(n.) The outer part of the
fructification
of most
lichens.
Orcin
::
Orcin (n.) A
colorless
crystalline
substance,
C6H3.CH3.(OH)2,
which is
obtained
from
certain
lichens
(Roccella,
Lecanora,
etc.),
also from
extract
of
aloes,
and
artificially
from
certain
derivatives
of
toluene.
It
changes
readily
into
orcein..
Lichenologist
::
Lichenologist
(n.) One
versed
in
lichenology.
Trica
::
Trica (n.) An
apothecium
in
certain
lichens,
having
a
spherical
surface
marked
with
spiral
or
concentric
ridges
and
furrows..
Ascospore
::
Ascospore
(n.) One of the
spores
contained
in the asci of
lichens
and
fungi.
[See
Illust.
of
Ascus..
Ascus
::
Ascus (n.) A small
membranous
bladder
or tube in which are
inclosed
the
seedlike
reproductive
particles
or
sporules
of
lichens
and
certain
fungi.
Parietic
::
Parietic
(a.)
Pertaining
to, or
designating,
an acid found in the
lichen
Parmelia
parietina,
and
called
also
chrysophanic
acid..
Agar-agar
::
Agar-agar
(n.) A fucus or
seaweed
much used in the East for soups and
jellies;
Ceylon
moss
(Gracilaria
lichenoides).
Eschara
::
Eschara
(n.) A genus of
Bryozoa
which
produce
delicate
corals,
often
incrusting
like
lichens,
but
sometimes
branched..
Lichenous
::
Lichenous
(a.) Of,
pertaining
to, or
resembling,
lichens;
abounding
in
lichens;
covered
with
lichens..
Cetrarin
::
Cetrarin
(n.) A white
substance
extracted
from the
lichen,
Iceland
moss
(Cetraria
Islandica).
It
consists
of
several
ingredients,
among which is
cetraric
acid, a
white,
crystalline,
bitter
substance..
Areola
::
Areola
(n.) An
interstice
or small
space,
as
between
the
cracks
of the
surface
in
certain
crustaceous
lichens;
or as
between
the
fibers
composing
organs
or
vessels
that
interlace;
or as
between
the
nervures
of an
insect's
wing..
Lichen
::
Lichen
(n.) A name given to
several
varieties
of skin
disease,
esp. to one
characterized
by the
eruption
of
small,
conical
or flat,
reddish
pimples,
which,
if
unchecked,
tend to
spread
and
produce
great and even fatal
exhaustion..
Persis
::
Persis
(n.) A kind of
coloring
matter
obtained
from
lichens.
Scyphus
::
Scyphus
(n.) A
cup-shaped
stem or
podetium
in
lichens.
Also
called
scypha.
See
Illust.
of
Cladonia
pyxidata,
under
Lichen..
Lichened
::
Lichened
(a.)
Belonging
to, or
covered
with,
lichens..
Rhizine
::
Rhizine
(n.) A
rootlike
filament
or hair
growing
from the stems of
mosses
or on
lichens;
a
rhizoid.
Hyphae
::
Hyphae
(n. pl.) The long,
branching
filaments
of which the
mycelium
(and the
greater
part of the
plant)
of a
fungus
is
formed.
They are also found
enveloping
the
gonidia
of
lichens,
making
up a large part of their
structure..
Crottles
::
Crottles
(n. pl.) A name given to
various
lichens
gathered
for
dyeing.
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