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fern    音标拼音: [f'ɚn]
n. 蕨类植物

蕨类植物

fern
n 1: any of numerous flowerless and seedless vascular plants
having true roots from a rhizome and fronds that uncurl
upward; reproduce by spores

Fern \Fern\, adv.
Long ago. [Obs.] --Chaucer.
[1913 Webster]


Fern \Fern\, a. [AS. fyrn.]
Ancient; old. [Obs.] "Pilgrimages to . . . ferne halwes."
[saints]. --Chaucer.
[1913 Webster]


Fern \Fern\ (f[~e]rn), n. [AS. fearn; akin to D. varen, G. farn,
farnkraut; cf. Skr. par[.n]a wing, feather, leaf, sort of
plant, or Lith. papartis fern.] (Bot.)
An order of cryptogamous plants, the {Filices}, which have
their fructification on the back of the fronds or leaves.
They are usually found in humid soil, sometimes grow
epiphytically on trees, and in tropical climates often attain
a gigantic size.
[1913 Webster]

Note: The plants are asexual, and bear clustered sporangia,
containing minute spores, which germinate and form
prothalli, on which are borne the true organs of
reproduction. The brake or bracken, the maidenhair, and
the polypody are all well known ferns.
[1913 Webster]

{Christmas fern}. See under {Christmas}.

{Climbing fern} (Bot.), a delicate North American fern
({Lygodium palmatum}), which climbs several feet high over
bushes, etc., and is much sought for purposes of
decoration.

{Fern owl}. (Zool.)
(a) The European goatsucker.
(b) The short-eared owl. [Prov. Eng.] -- {Fern shaw}, a fern
thicket. [Eng.] --R. Browning.
[1913 Webster]


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  • Fern - Wikipedia
    As in all vascular plants, the sporophyte is the dominant phase or generation in the life cycle The gametophytes of ferns, however, are very different from those of seed plants They are free-living and resemble liverworts, whereas those of seed plants develop within the spore wall and are dependent on the parent sporophyte for their nutrition [17] A fern gametophyte typically consists of
  • Fern | Description, Features, Evolution, Taxonomy | Britannica
    Fern, class of several thousand species of nonflowering vascular plants that reproduce by spores Ferns have true roots, stems, and complex leaves and constitute an ancient division of plants Learn about their physical characteristics, life cycle, genetics, evolutionary history, and classification
  • 30 Different Types of Ferns (with Pictures) - Plantglossary
    Ferns are one of the oldest types of plants on the planet, with fern fossils dating back as far as 360 million years There are a huge range of ferns still alive today, growing in a variety of climates and habitats all over the world Estimates indicate that there are between 10,000 and 15,000 different types of ferns Here we take a closer look at some of the most popular ferns amongst gardeners
  • About Ferns - American Fern Society
    Most fern fronds also have circinate vernation, in which the new growth is tightly coiled in a fractal spiral, which gradually unfurls as the leaf develops, protecting the meristem This curling forms the familiar fiddlehead at the tip of new fronds
  • FERN Definition Meaning - Merriam-Webster
    The meaning of FERN is any of a division (Polypodiophyta) or class (Polypodiopsida) of flowerless spore-producing vascular plants having alternating sporophyte and gametophyte generations; especially : any of an order (Polypodiales) of homosporous plants possessing roots, stems, and leaflike fronds
  • 35 Types of Fern to Freshen Up Your Home or Garden - The Spruce
    Ferns are perfect for shady, damp spots where other plants struggle to grow Learn about these 35 types of ferns for a woodland garden or wet bathroom
  • Fern - Simple English Wikipedia, the free encyclopedia
    Fern s are a group of about 20,000 species of plants About 10,000 are living: they are in the division Pteridophyta [2] Unlike bryophytes, ferns have xylem and phloem, which makes them vascular plants Unlike seed plants like angiosperms (flowering plants) or gymnosperms, ferns do not have seeds Instead, they reproduce by releasing their spores into the environment where the germinate into
  • Fern Varieties: 20 Types Of Indoors Outdoors Ferns with Pictures
    Here is a list of 20 stunning fern varieties to grow indoors or outdoors with pictures and useful tips to help you to identify the different species of ferns and give them the care they need
  • Fern - New World Encyclopedia
    A fern, or pteridophyte, is any one of a group of plants classified in the Division Pteridophyta, formerly known as Filicophyta A fern is a vascular plant that differs from the more primitive lycophytes in having true leaves (megaphylls) and from the more advanced seed plants (gymnosperms and angiosperms) in lacking seeds, and instead reproducing with spores There are an estimated 10-15,000
  • What Are Ferns? - US Forest Service
    What Are Ferns? Ferns are plants that do not have flowers Ferns generally reproduce by producing spores Similar to flowering plants, ferns have roots, stems and leaves However, unlike flowering plants, ferns do not have flowers or seeds; instead, they usually reproduce sexually by tiny spores or sometimes can reproduce vegetatively, as exemplified by the walking fern In the past, ferns had





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