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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
    A lichen ( ˈ l aɪ k ən LIE-kən, UK also ˈ l ɪ tʃ ən LI-chən) is a hybrid colony of algae or cyanobacteria living symbiotically among filaments of multiple fungus species, along with yeasts and bacteria [1] [2] embedded in the cortex or "skin", in a mutualistic relationship
  • 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 (mostly ascomycetes and basidiomycetes) Lichens are found worldwide and occur in a variety of environmental conditions
  • Lichen - The Little Things That Matter - U. S. National Park Service
    Lichen are small organisms commonly found throughout the forests of North America They’re neither plant or animal, but rather they’re organisms unlike any other on Earth While most people may think lichen are a type of moss, they are actually a combination of an algae and a fungus
  • About Lichens - US Forest Service
    Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an alga 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 Biology - US Forest Service
    Lichen Biology Structure Lichens do not have a waxy cuticle like plants have on their leaves, nor do they have vascular tissue such as xylem and phloem to move nutrients and water around their thalli as a plant does Everything in the lichen’s environment is absorbed into the lichen's structure
  • Lichen Basics - North American Mycological Association
    Get to know the lichens They are fascinating organisms You can study them at any time of the year and in any weather conditions Congratulations to California In 2016, they became the first state to have a “State Lichen” Ramalina menziesii,the Lace Lichen (Figures 9A and 9B)
  • Lichens: Characteristics, Types, Structure, Reproduction, Uses
    Morphologically, they are of three types- Crustose lichen, foliose lichen and fruticose lichen Lichen reproduces by vegetative, asexual and sexual methods Only mycobiont is involved in sexual reproduction
  • What are Lichens? – Characteristics, Types, Structure, Reproduction
    What is a Lichen? Lichens are fascinating symbiotic organisms They consist of algae or cyanobacteria living among filaments of multiple fungi species Embedded within this structure, there is often yeast in the cortex, or “skin,” forming a mutualistic relationship
  • 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





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