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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
    Ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (land plants with vascular tissues such as xylem and phloem) that reproduce via spores and have neither seeds nor flowers
  • 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
  • 35 Types of Fern to Freshen Up Your Home or Garden - The Spruce
    With approximately 10,000 different species, ferns come in various sizes, shapes, and growth patterns, commonly thriving in shady, moist environments These perennials can be evergreen or deciduous and propagate through spores found on their fronds
  • Fern Canyon in Prairie Creek Redwoods SP - visitredwoods. com
    Fern Canyon is a remarkable place A level trail of about one mile follows Home Creek as it courses through the forest This modest stream has over the eons carved a 50 to 80 foot deep canyon through the rich sedimentary soils The canyon walls sprout an amazing variety of luxuriant ferns and other moisture-loving plants On a sunny day, thousands of tiny drops of moisture make the canyon
  • About Ferns - American Fern Society
    What follows is a short primer on the biology of ferns, starting at the beginning, with how ferns first originated and evolved into the plants we see in the present, making special note of some of the groups that went extinct along the way
  • What Are Ferns? - US Forest Service
    Ferns are plants that do not have flowers Ferns generally reproduce by producing spores Similar to flowering plants, ferns have roots, stems and leaves
  • Fern - New World Encyclopedia
    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
  • Ferns - San Diego Zoo Animals Plants
    Ferns come in a wide variety of shapes, textures, colors, and sizes Some tree ferns can reach heights of more than 40 feet tall, while tiny aquatic ferns may only measure a few inches Humans have used ferns for fertilizer, medicine, food, and decoration
  • Fern - Simple English Wikipedia, the free encyclopedia
    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 a Prothallus





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