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lichen    音标拼音: [l'ɑɪkən]
n. 青苔,地衣,苔藓

青苔,地衣,苔藓

lichen
n 1: any of several eruptive skin diseases characterized by hard
thick lesions grouped together and resembling lichens
growing on rocks
2: any thallophytic plant of the division Lichenes; occur as
crusty patches or bushy growths on tree trunks or rocks or
bare ground etc.

Lichen \Li"chen\ (l[imac]"k[e^]n; 277), n. [L., fr. Gr.
leichh`n.]
1. (Bot.) 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 tenacity.
They are often improperly called {rock moss} or {tree
moss}.
[1913 Webster]

Note: A favorite modern theory of lichens (called after its
inventor the Schwendener hypothesis), is that they are
not autonomous plants, but that they consist of
ascigerous fungi, parasitic on alg[ae]. Each lichen is
composed of white filaments and green, or greenish,
rounded cells, and it is argued that the two are of
different nature, the one living at the expense of the
other. See {Hyph[ae]}, and {Gonidia}.
[1913 Webster]

2. (Med.) 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.
[1913 Webster]

88 Moby Thesaurus words for "lichen":
acne, acne vulgaris, algae, autophyte, bean, bracken, brown algae,
climber, conferva, confervoid, creeper, dermamycosis, dermatitis,
dermatosis, diatom, eczema, elephantiasis, epithelioma, erysipelas,
erythema, exanthem, fern, fruits and vegetables, fucus, fungus,
grapevine, green algae, gulfweed, heat rash, herb, herpes,
herpes simplex, herpes zoster, heterophyte, hives, impetigo, itch,
ivy, jungle rot, kelp, legume, lentil, leprosy, liana,
lichen primus, liverwort, lupus, lupus vulgaris, miliaria, mold,
moss, mushroom, parasite, parasitic plant, pea, pemphigus,
perthophyte, phytoplankton, planktonic algae, plant families,
prickly heat, pruigo, pruritus, psora, puffball, pulse, red algae,
ringworm, rockweed, rust, saprophyte, sargasso, sargassum, scabies,
sea lentil, sea moss, sea wrack, seaweed, shingles, skin cancer,
smut, succulent, tetter, toadstool, vetch, vine, wort, wrack


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  • Lichen - Wikipedia
    Although some photosynthetic partners in a lichen can survive outside the lichen, the lichen symbiotic association extends the ecological range of both partners, whereby most descriptions of lichen associations describe them as symbiotic
  • What Is a Lichen? Definition and Facts - Science Notes and Projects
    A lichen is a symbiotic relationship between a fungus and a photosynthetic partner (algae, cyanobacteria, or both) Lichens grow all over the world and can even survive exposure to space
  • Lichen | Definition, Symbiotic Relationship, Mutualism, Types, Facts . . .
    Lichen, any of about 15,000 species of plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi They are found worldwide and occur in a variety of environmental conditions
  • About Lichens - US Forest Service
    The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruiting bodies The alga can be either a green alga or a blue-green alga, otherwise known as cyanobacteria
  • Lichen: What the fungus is it? - U. S. Fish Wildlife Service
    Some birds may incorporate lichen at random, while a select few, namely hummingbirds and gnatcatchers, appear to use lichen every time they build their nests Lichens are also a good reflection of how well an environment is doing
  • Lichens: Characteristics, Types, Structure, Reproduction, Uses
    Squamulose lichen – It is lichen that is composed of overlapping scales called squamules If they appear leafy, they may look like foliose lichen but the lower cortex is absent as foliose lichens do
  • What is a Lichen? - The British Lichen Society
    A lichen is not a single organism; it is a stable symbiotic association between a fungus and algae and or cyanobacteria Like all fungi, lichen fungi require carbon as a food source; this is provided by their symbiotic algae and or cyanobacteria, that are photosynthetic
  • LICHEN Definition Meaning - Merriam-Webster
    The meaning of LICHEN is any of numerous complex plantlike organisms made up of an alga or a cyanobacterium and a fungus growing in symbiotic association on a solid surface (such as on a rock or the bark of trees)
  • What are lichens and what are they doing on my tree?
    The red caps on this lichen give it the common name “British soldiers ” Photo by Bert Cregg, MSU One of the most important things to know about lichens is that they are harmless to their hosts they occur on Lichens are self-sufficient for their energy needs – recall the algae are photosynthetic – so they are not parasitic on their host
  • Ten Things You Might Not Know About Lichens, But Wish You Did . . .
    Tiny fragments of lichen have been found on the larvae of lacewing insects to help camouflage them and the insects disperse asexual lichen soredia (spore-like bits of lichen and algae) in return Some lichens can live for decades or centuries, but grow very slowly





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