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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.) 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..
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Amphigenous
::
Amphigenous
(a.)
Increasing
in size by
growth
on all
sides,
as the
lichens..
Lichenography
::
Lichenography
(n.) A
description
of
lichens;
the
science
which
illustrates
the
natural
history
of
lichens.
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..
Maplike
::
Maplike
(a.)
Having
or
consisting
of lines
resembling
a map; as, the
maplike
figures
in which
certain
lichens
grow..
Persis
::
Persis
(n.) A kind of
coloring
matter
obtained
from
lichens.
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..
Spermogonium
::
Spermogonium
(n.) A
conceptacle
of
certain
lichens,
which
contains
spermatia..
Angiocarpous
::
Angiocarpous
(a.)
Having
the seeds or
spores
covered,
as in
certain
lichens..
Lichen
::
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
Gonidium
::
Gonidium
(n.) A
component
cell of the
yellowish
green layer in
certain
lichens.
Gonimia
::
Gonimia
(n. pl.)
Bluish
green
granules
which occur in
certain
lichens,
as
Collema,
Peltigera,
etc., and which
replace
the more usual
gonidia..
Cup-moss
::
Cup-moss
(n.) A kind of
lichen,
of the genus
Cladonia..
Orsellic
::
Orsellic
(a.)
Pertaining
to, or
designating,
an acid found in
certain
lichens,
and
called
also
lecanoric
acid..
Thallogen
::
Thallogen
(n.) One of a large class or
division
of the
vegetable
kingdom,
which
includes
those
flowerless
plants,
such as
fungi,
algae,
and
lichens,
that
consist
of a
thallus
only,
composed
of
cellular
tissue,
or of a
congeries
of
cells,
or even of
separate
cells,
and never show a
distinction
into root, stem, and
leaf..
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..
Treebeard
::
Treebeard
(n.) A
pendulous
branching
lichen
(Usnea
barbata);
-- so
called
from its
resemblance
to hair.
Gonimous
::
Gonimous
(a.)
Pertaining
to, or
containing,
gonidia
or
gonimia,
as that part of a
lichen
which
contains
the green or
chlorophyll-bearing
cells..
Erythrite
::
Erythrite
(n.) A
colorless
crystalline
substance,
C4H6.(OH)4,
of a
sweet,
cooling
taste,
extracted
from
certain
lichens,
and
obtained
by the
decomposition
of
erythrin;
--
called
also
erythrol,
erythroglucin,
erythromannite,
pseudorcin,
cobalt
bloom,
and under the name
phycite
obtained
from the alga
Protococcus
vulgaris.
It is a
tetrabasic
alcohol,
corresponding
to
glycol
and
glycerin..
Cudbear
::
Cudbear
(n.) A
powder
of a
violet
red
color,
difficult
to
moisten
with
water,
used for
making
violet
or
purple
dye. It is
prepared
from
certain
species
of
lichen,
especially
Lecanora
tartarea..
Eschara
::
Eschara
(n.) A genus of
Bryozoa
which
produce
delicate
corals,
often
incrusting
like
lichens,
but
sometimes
branched..
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