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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
    The shape of a lichen is usually determined by the organization of the fungal filaments [36] The nonreproductive tissues, or vegetative body parts, are called the thallus Lichens are grouped by thallus type, since the thallus is usually the most visually prominent part of the lichen
  • 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
  • What Is a Lichen? Definition and Facts - Science Notes and Projects
    A lichen is a symbiotic partnership between fungi and either algae or cyanobacteria While you may not notice lichens in the world around you, they make up a significant part of the biosphere and are important both in ecology and to humans
  • 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
  • Lichens: Characteristics, Types, Structure, Reproduction, Uses
    The internal structure of Usnea, fruticose lichen, is slightly different due to its cylindrical cross-section The layers from outside to inside include the cortex, medulla (composed of algal cells and fungal mycelium), and a central chondroid axis (composed of compactly arranged fungal mycelia)
  • What Is Lichen? A Complete Beginner’s Guide | Live to Plant
    If you’re curious about what lichen is, how it grows, and why it matters, this comprehensive beginner’s guide will walk you through everything you need to know
  • 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 as the common ancestor of all life on earth
    The alternate “Lichen as last universal common ancestor” model, which I will refer to for convenience as “Big Lichen”, does not expect so little of mother nature
  • 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)
  • Introduction to Lichens
    A lichen is not a single organism the way most other living things are, but rather it is a combination of two organisms which live together intimately Most of the lichen is composed of fungal filaments, but living among the filaments are algal cells, usually from a green alga or a cyanobacterium





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