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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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Orchilla Weed
::
Orchilla
weed () The
lichen
from which
archil
is
obtained.
See
Archil.
Excipulum
::
Excipulum
(n.) The outer part of the
fructification
of most
lichens.
Manna
::
Manna (n.) A name given to
lichens
of the genus
Lecanora,
sometimes
blown into heaps in the
deserts
of
Arabia
and
Africa,
and
gathered
and used as
food..
Parietic
::
Parietic
(a.)
Pertaining
to, or
designating,
an acid found in the
lichen
Parmelia
parietina,
and
called
also
chrysophanic
acid..
Usnea
::
Usnea (n.) A genus of
lichens,
most of the
species
of which have long, gray,
pendulous,
and
finely
branched
fronds.
Usnea
barbata
is the
common
bearded
lichen
which grows on
branches
of trees in
northern
forests..
Cetraric
::
Cetraric
(a.)
Pertaining
to, or
derived
from, the
lichen,
Iceland
moss
(Cetaria
Islandica)..
Roccellic
::
Roccellic
(a.)
Pertaining
to, or
designating,
a
dibasic
acid of the
oxalic
series
found in
archil
(Roccella
tinctoria,
etc.),
and other
lichens,
and
extracted
as a white
crystalline
substance
C17H32O4..
Lichenographist
::
Lichenographist
(n.) One who
describes
lichens;
one
versed
in
lichenography.
Apothecium
::
Apothecium
(n.) The
ascigerous
fructification
of
lichens,
forming
masses
of
various
shapes..
Trica
::
Trica (n.) An
apothecium
in
certain
lichens,
having
a
spherical
surface
marked
with
spiral
or
concentric
ridges
and
furrows..
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..
Vulpic
::
Vulpic
(a.)
Pertaining
to,
derived
from, or
designating,
an acid
obtained
from a
lichen
(Cetraria
vulpina)
as a
yellow
or red
crystalline
substance
which on
decomposition
yields
pulvinic
acid..
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..
Patella
::
Patella
(n.) A kind of
apothecium
in
lichens,
which is
orbicular,
flat, and
sessile,
and has a
special
rim not a part of the
thallus..
Eschara
::
Eschara
(n.) A genus of
Bryozoa
which
produce
delicate
corals,
often
incrusting
like
lichens,
but
sometimes
branched..
Perithecium
::
Perithecium
(n.) An organ in
certain
fungi and
lichens,
surrounding
and
enveloping
the
masses
of
fructification..
Maplike
::
Maplike
(a.)
Having
or
consisting
of lines
resembling
a map; as, the
maplike
figures
in which
certain
lichens
grow..
Soredium
::
Soredium
(n.) A patch of
granular
bodies
on the
surface
of the
thallus
of
lichens.
Angiocarpous
::
Angiocarpous
(a.)
Having
the seeds or
spores
covered,
as in
certain
lichens..
Orsellic
::
Orsellic
(a.)
Pertaining
to, or
designating,
an acid found in
certain
lichens,
and
called
also
lecanoric
acid..
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