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This article is about the group of pteridophyte plants. For other uses, see Fern (disambiguation).
Ferns
Temporal range: Late Devonian[1]—Recent
Athyrium filix-femina.jpg
A fern unrolling a young frond
Scientific classification
Kingdom: Plantae
(unranked): Monilophytes or pteridophytes
Classes[2]
Synonyms
  • Monilophyta
  • Polypodiophyta
  • Filices
  • Filicophyta

A fern is a member of a group of roughly 12,000 species[3] of vascular plants that reproduce via spores and have neither seeds nor flowers. They differ from mosses by being vascular (i.e. having water-conducting vessels). They have stems and leaves, like other vascular plants. Most ferns have what are called fiddleheads that expand into fronds, which are each delicately divided.[4]

Leptosporangiate ferns (sometimes called "true ferns") are by far the largest group, but ferns as defined here (ferns sensu lato) include horsetails, whisk ferns, marattioid ferns, and ophioglossoid ferns. This group may be referred to as monilophytes. The term pteridophyte traditionally refers to ferns plus a few other seedless vascular plants (see the classification section below), although some recent authors have used the term to refer strictly to the monilophytes.

Ferns first appear in the fossil record 360 million years ago in the late Devonian period[5] but many of the current families and species did not appear until roughly 145 million years ago in the early Cretaceous, after flowering plants came to dominate many environments.

Ferns are not of major economic importance, but some are grown or gathered for food, as ornamental plants, for remediating contaminated soils, and have been the subject of research for their ability to remove some chemical pollutants from the air. Some are significant weeds. They also play a role in mythology, medicine, and art.

Description[edit]

Life cycle[edit]

Gametophyte (thalloid green mass) and sporophyte (ascendent frond) of Onoclea sensibilis

Ferns are vascular plants differing from lycophytes by having true leaves (megaphylls), which are often pinnate. They differ from seed plants (gymnosperms and angiosperms) in their mode of reproduction—lacking flowers and seeds. Like all other vascular plants, they have a life cycle referred to as alternation of generations, characterized by alternating diploid sporophytic and haploid gametophytic phases. The diploid sporophyte has 2n paired chromosomes, where n varies from species to species. The haploid gametophyte has n unpaired chromosomes, i.e. half the number of the sporophyte. The gametophyte of ferns is a free-living organism, whereas the gametophyte of the gymnosperms and angiosperms is dependent on the sporophyte.

Life cycle of a typical fern:

  1. A diploid sporophyte phase produces haploid spores by meiosis (a process of cell division which reduces the number of chromosomes by a half).
  2. A spore grows into a haploid gametophyte by mitosis (a process of cell division which maintains the number of chromosomes). The gametophyte typically consists of a photosynthetic prothallus.
  3. The gametophyte produces gametes (often both sperm and eggs on the same prothallus) by mitosis.
  4. A mobile, flagellate sperm fertilizes an egg that remains attached to the prothallus.
  5. The fertilized egg is now a diploid zygote and grows by mitosis into a diploid sporophyte (the typical "fern" plant).

Morphology[edit]

Ferns at the Royal Melbourne Botanical Gardens
Tree ferns, probably Dicksonia antarctica, growing in Nunniong, Australia

Like the sporophytes of seed plants, those of ferns consist of:

  • Stems: Fern stems are often referred to as rhizomes, even though they grow underground only in a some of the species. Epiphytic species and many of the terrestrial ones have above-ground creeping stolons (e.g., Polypodiaceae), and many groups have above-ground erect semi-woody trunks (e.g., Cyatheaceae). These can reach up to 20 m tall in a few species (e.g., Cyathea brownii on Norfolk Island and Cyathea medullaris in New Zealand).
  • Leaf: The green, photosynthetic part of the plant is technically a megaphyll and in ferns, it is often referred to as a frond. New leaves typically expand by the unrolling of a tight spiral called a crozier or fiddlehead fern. This uncurling of the leaf is termed circinate vernation. Leaves are divided into two types:
    • Trophophyll: A vegetative leaf analogous to the typical green leaves of seed plants that does not produce spores, instead only producing sugars by photosynthesis.
    • Sporophyll: A fertile leaf that produces spores borne in sporangia that are usually clustered to form sori. In most ferns, fertile leaves are morphologically very similar to the sterile ones, and they photosynthesize in the same way. In some groups, the fertile leaves are much narrower than the sterile leaves, and may even have no green tissue at all (e.g., Blechnaceae, Lomariopsidaceae).
  • Roots: The underground non-photosynthetic structures that take up water and nutrients from soil. They are always fibrous and are structurally very similar to the roots of seed plants.

The gametophytes of ferns, however, are very different from those of seed plants. Instead, they resemble liverworts. A fern gametophyte typically consists of:

  • Prothallus: A green, photosynthetic structure that is one cell thick, usually heart or kidney shaped, 3–10 mm long and 2–8 mm broad. The prothallus produces gametes by means of:
    • Antheridia: Small spherical structures that produce flagellate sperm.
    • Archegonia: A flask-shaped structure that produces a single egg at the bottom, reached by the sperm by swimming down the neck.
  • Rhizoids: root-like structures (not true roots) that consist of single greatly elongated cells, water and mineral salts are absorbed over the whole structure. Rhizoids anchor the prothallus to the soil.

One difference between sporophytes and gametophytes might be summed up by the saying that "Nothing eats ferns, but everything eats gametophytes." This is an over-simplification, but it is true that gametophytes are often difficult to find in the field because they are far more likely to be food than are the sporophytes.[citation needed]

Evolution, phylogeny and classification[edit]

Ferns first appear in the fossil record in the early-Carboniferous period. By the Triassic, the first evidence of ferns related to several modern families appeared. The "great fern radiation" occurred in the late-Cretaceous, when many modern families of ferns first appeared.

One problem with fern classification is the problem of cryptic species. A cryptic species is a species that is morphologically similar to another species, but differs genetically in ways that prevent fertile interbreeding. A good example of this is the currently designated species Asplenium trichomanes, the maidenhair spleenwort. This is actually a species complex that includes distinct diploid and tetraploid races. There are minor but unclear morphological differences between the two groups, which prefer distinctly differing habitats. In many cases such as this, the species complexes have been separated into separate species, thus raising the number of overall fern species. Possibly many more cryptic species are yet to be discovered and designated.

Ferns have traditionally been grouped in the Class Filices, but modern classifications assign them their own phylum or division in the plant kingdom, called Pteridophyta, also known as Filicophyta. The group is also referred to as Polypodiophyta, (or Polypodiopsida when treated as a subdivision of tracheophyta (vascular plants), although Polypodiopsida sometimes refers to only the leptosporangiate ferns). The term "pteridophyte" has traditionally been used to describe all seedless vascular plants, making it synonymous with "ferns and fern allies". This can be confusing since members of the fern phylum Pteridophyta are also sometimes referred to as pteridophytes.

Traditionally, three discrete groups of plants have been considered ferns: two groups of eusporangiate ferns—families Ophioglossaceae (adders-tongues, moonworts, and grape-ferns) and Marattiaceae—and the leptosporangiate ferns. The Marattiaceae are a primitive group of tropical ferns with a large, fleshy rhizome, and are now thought to be a sibling taxon to the main group of ferns, the leptosporangiate ferns. Several other groups of plants were considered "fern allies": the clubmosses, spikemosses, and quillworts in the Lycopodiophyta, the whisk ferns in Psilotaceae, and the horsetails in the Equisetaceae. More recent genetic studies have shown that the Lycopodiophyta are more distantly related to other vascular plants, having radiated evolutionarily at the base of the vascular plant clade, while both the whisk ferns and horsetails are as much "true" ferns as are the Ophioglossoids and Marattiaceae. In fact, the whisk ferns and Ophioglossoids are demonstrably a clade, and the horsetails and Marattiaceae are arguably another clade. Molecular data—which remain poorly constrained for many parts of the plants' phylogeny — have been supplemented by recent morphological observations supporting the inclusion of Equisetaceae within the ferns, notably relating to the construction of their sperm, and peculiarities of their roots.[2] However, there are still differences of opinion about the placement of the Equisetum species (see Equisetopsida for further discussion). One possible means of treating this situation is to consider only the leptosporangiate ferns as "true" ferns, while considering the other three groups as "fern allies". In practice, numerous classification schemes have been proposed for ferns and fern allies, and there has been little consensus among them.

A 2006 classification by Smith et al. is based on recent molecular systematic studies, in addition to morphological data. Their phylogeny is a consensus of a number of studies. This phylogeny has been refined in more recent years,[6][7] and is shown below (to the level of orders).[2][8]


Trachaeophyta

Lycopodiophytes (club mosses, spike mosses, quillworts)


Euphyllophytes

Spermatophytes (seed plants)


Ferns

Psilotopsida

 Psilotales (whisk ferns) 



 Ophioglossales (grapeferns etc.) 



Equisetopsida

 Equisetales (horsetails) 





Marattiopsida

 Marattiales 



Polypodiopsida

 Osmundales 




 Hymenophyllales (filmy ferns) 




 Gleicheniales 




 Schizaeales 




 Salviniales (heterosporous) 




 Cyatheales (tree ferns) 



 Polypodiales 













Their classification based on this phylogeny divides extant ferns into four classes:

Others have divided extant ferns into five groups (Psilotales, Ophioglossales, Equisetales, Marattiales and Polypodiopsida), separating the whisk ferns and ophioglossoid ferns.[6]

The leptosporangiate ferns are sometimes called "true ferns".[10] This group includes most plants familiarly known as ferns. Modern research supports older ideas based on morphology that the Osmundaceae diverged early in the evolutionary history of the leptosporangiate ferns; in certain ways this family is intermediate between the eusporangiate ferns and the leptosporangiate ferns. Research by Rai and Graham (2010) since this 2006 classification broadly supports the main groups, but queries their relationships, concluding that "at present perhaps the best that can be said about all relationships among the major lineages of monilophytes in current studies is that we do not understand them very well".[11] Grewe et al. (2013) confirmed the inclusion of horsetails within ferns sensu lato, but also suggested that uncertainties remained in their precise placement.[6]

Ecology[edit]

Ferns at Muir Woods, California

The stereotypical image of ferns growing in moist shady woodland nooks is far from a complete picture of the habitats where ferns can be found growing. Fern species live in a wide variety of habitats, from remote mountain elevations, to dry desert rock faces, to bodies of water or in open fields. Ferns in general may be thought of as largely being specialists in marginal habitats, often succeeding in places where various environmental factors limit the success of flowering plants. Some ferns are among the world's most serious weed species, including the bracken fern growing in the Scottish highlands, or the mosquito fern (Azolla) growing in tropical lakes, both species forming large aggressively spreading colonies. There are four particular types of habitats that ferns are found in: moist, shady forests; crevices in rock faces, especially when sheltered from the full sun; acid wetlands including bogs and swamps; and tropical trees, where many species are epiphytes (something like a quarter to a third of all fern species[12]).

Many ferns depend on associations with mycorrhizal fungi. Many ferns only grow within specific pH ranges; for instance, the climbing fern (Lygodium palmatum) of eastern North America will only grow in moist, intensely acid soils, while the bulblet bladder fern (Cystopteris bulbifera), with an overlapping range, is only found on limestone.

The spores are rich in lipids, protein and calories, so some vertebrates eat these. The European woodmouse (Apodemus sylvaticus) has been found to eat the spores of Culcita macrocarpa and the bullfinch (Pyrrhula murina) and the New Zealand lesser short-tailed bat (Mystacina tuberculata) also eat fern spores.[13]

Uses[edit]

Ferns are not as important economically as seed plants but have considerable importance in some societies. Some ferns are used for food, including the fiddleheads of bracken, Pteridium aquilinum, ostrich fern, Matteuccia struthiopteris, and cinnamon fern, Osmundastrum cinnamomeum. Diplazium esculentum is also used by some tropical people as food. Tubers from the King Fern or para (Ptisana salicina) are a traditional food in New Zealand and the South Pacific. Fern tubers were used for food 30,000 years ago in Europe.[14][15] Fern tubers were used by the Guanches to make gofio in the Canary Islands. Ferns are generally not known to be poisonous to humans.[16] Licorice fern rhizomes were chewed by the natives of the Pacific Northwest for their flavor.[citation needed]

Ferns of the genus Azolla are very small, floating plants that do not resemble ferns. Called mosquito fern, they are used as a biological fertilizer in the rice paddies of southeast Asia, taking advantage of their ability to fix nitrogen from the air into compounds that can then be used by other plants.[1][citation needed]

Many ferns are grown in horticulture as landscape plants, for cut foliage and as houseplants, especially the Boston fern (Nephrolepis exaltata) and other members of the genus Nephrolepis. The Bird's Nest Fern (Asplenium nidus) is also popular, as are the staghorn ferns (genus Platycerium). Perennial (also known as hardy) ferns planted in gardens in the northern hemisphere also have a considerable following.[citation needed]

Several ferns are noxious weeds or invasive species, including Japanese climbing fern (Lygodium japonicum), mosquito fern and sensitive fern (Onoclea sensibilis). Giant water fern (Salvinia molesta) is one of the world's worst aquatic weeds. The important fossil fuel coal consists of the remains of primitive plants, including ferns.[citation needed]

Ferns have been studied and found to be useful in the removal of heavy metals, especially arsenic, from the soil. Other ferns with some economic significance include:[citation needed]

  • Dryopteris filix-mas (male fern), used as a vermifuge, and formerly in the US Pharmacopeia; also, this fern accidentally sprouting in a bottle resulted in Nathaniel Bagshaw Ward's 1829 invention of the terrarium or Wardian case
  • Rumohra adiantiformis (floral fern), extensively used in the florist trade
  • Microsorum pteropus (Java fern), one of the most popular freshwater aquarium plants.
  • Osmunda regalis (royal fern) and Osmunda cinnamomea (cinnamon fern), the root fiber being used horticulturally; the fiddleheads of O. cinnamomea are also used as a cooked vegetable
  • Matteuccia struthiopteris (ostrich fern), the fiddleheads used as a cooked vegetable in North America
  • Pteridium aquilinum or Pteridium esculentum (bracken), the fiddleheads used as a cooked vegetable in Japan and are believed to be responsible for the high rate of stomach cancer in Japan. It is also one of the world's most important agricultural weeds, especially in the British highlands, and often poisons cattle and horses.
  • Diplazium esculentum (vegetable fern), a source of food for some native societies
  • Pteris vittata (brake fern), used to absorb arsenic from the soil
  • Polypodium glycyrrhiza (licorice fern), roots chewed for their pleasant flavor
  • Tree ferns, used as building material in some tropical areas
  • Cyathea cooperi (Australian tree fern), an important invasive species in Hawaii
  • Ceratopteris richardii, a model plant for teaching and research, often called C-fern

Culture[edit]

Blätter des Manns Walfarn. by Alois Auer, Vienna: Imperial Printing Office, 1853

Pteridologist[edit]

The study of ferns and other pteridophytes is called pteridology. A pteridologist is a specialist in the study of pteridophytes in a broader sense that includes the more distantly related lycophytes.

Pteridomania[edit]

"Pteridomania"' is a term for the Victorian era craze of fern collecting and fern motifs in decorative art including pottery, glass, metals, textiles, wood, printed paper, and sculpture "appearing on everything from christening presents to gravestones and memorials." The fashion for growing ferns indoors led to the development of the Wardian case, a glazed cabinet that would exclude air pollutants and maintain the necessary humidity.[17]

Barnsley fern created using chaos game, through an Iterated function system (IFS).

The dried form of ferns was also used in other arts, being used as a stencil or directly inked for use in a design. The botanical work, The Ferns of Great Britain and Ireland, is a notable example of this type of nature printing. The process, patented by the artist and publisher Henry Bradbury, impressed a specimen on to a soft lead plate. The first publication to demonstrate this was Alois Auer's The Discovery of the Nature Printing-Process.

New Zealand icon[edit]

The silver fern in particular has a prominent place within New Zealand culture. Its leaf features as the emblem of many of the country's top national sports teams, including the eponymous Silver Ferns and the All Blacks.

Folklore[edit]

Ferns figure in folklore, for example in legends about mythical flowers or seeds.[18] In Slavic folklore, ferns are believed to bloom once a year, during the Ivan Kupala night. Although alleged to be exceedingly difficult to find, anyone who sees a "fern flower" is thought to be guaranteed to be happy and rich for the rest of their life. Similarly, Finnish tradition holds that one who finds the "seed" of a fern in bloom on Midsummer night will, by possession of it, be guided and be able to travel invisibly to the locations where eternally blazing Will o' the wisps called aarnivalkea mark the spot of hidden treasure. These spots are protected by a spell that prevents anyone but the fern-seed holder from ever knowing their locations.[19]

Organisms confused with ferns[edit]

Misunderstood names[edit]

Several non-fern plants (and even animals) are called "ferns" and are sometimes confused with true ferns. These include:

  • "Asparagus fern"—This may apply to one of several species of the monocot genus Asparagus, which are flowering plants.
  • "Sweetfern"—A flowering shrub of the genus Comptonia.
  • "Air fern"—A group of animals called hydrozoan that are distantly related to jellyfish and corals. They are harvested, dried, dyed green, and then sold as a "plant" that can "live on air". While it may look like a fern, it is merely the skeleton of this colonial animal.
  • "Fern bush"—Chamaebatiaria millefolium—a rose family shrub with fern-like leaves.

In addition, the book Where the Red Fern Grows has elicited many questions about the mythical "red fern" named in the book. There is no such known plant, although there has been speculation that the oblique grape-fern, Sceptridium dissectum, could be referred to here, because it is known to appear on disturbed sites and its fronds may redden over the winter.

Fern-like flowering plants[edit]

Some flowering plants such as palms and members of the carrot family have pinnate leaves that somewhat resemble fern fronds. However, these plants have fully developed seeds contained in fruits, rather than the microscopic spores of ferns.

Gallery[edit]

See also[edit]

References[edit]

  1. ^ Wattieza, Stein, W. E., F. Mannolini, L. V. Hernick, E. Landling, and C. M. Berry. 2007. "Giant cladoxylopsid trees resolve the enigma of the Earth's earliest forest stumps at Gilboa", Nature (19 April 2007) 446:904–907.
  2. ^ a b c Smith, A.R.; Pryer, K.M.; Schuettpelz, E.; Korall, P.; Schneider, H.; Wolf, P.G. (2006). "A classification for extant ferns". Taxon 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646. Retrieved 2008-02-12. [dead link]
  3. ^ Chapman, Arthur (2010-08-26). "Numbers of Living Species in Australia and the World. Report for the Australian Biological Resources Study. Canberra, Australia. September 2009.". Environment.gov.au. Retrieved 2013-09-07. 
  4. ^ McCausland, Jim (2009-09-20). "Rediscover ferns". Sunset.com. Retrieved 2013-09-07. 
  5. ^ "Pteridopsida: Fossil Record". University of California Museum of Paleontology. Retrieved 2014-03-11. 
  6. ^ a b c Grewe, Felix; et al. (2013). "Complete plastid genomes from Ophioglossum californicum, Psilotum nudum, and Equisetum hyemale reveal an ancestral land plant genome structure and resolve the position of Equisetales among monilophytes". BMC Evolutionary Biology 13 (1): 1–16. doi:10.1186/1471-2148-13-8. ISSN 1471-2148. Retrieved 21 May 2013. 
  7. ^ Karol, Kenneth G; et al. (2010). "Complete plastome sequences of Equisetum arvense and Isoetes flaccida: implications for phylogeny and plastid genome evolution of early land plant lineages.". BMC Evolutionary Biology 10: 321–336. doi:10.1186/1471-2148-10-321. ISSN 1471-2148. Retrieved 21 May 2013. 
  8. ^ Li et. al (2011)[dead link] Li F-W, Kuo L-Y, Rothfels CJ, Ebihara A, Chiou W-L, et al. (2011) "rbcL and matK Earn Two Thumbs Up as the Core DNA Barcode for Ferns." PLoS ONE 6(10): e26597. doi:10.1371/journal.pone.0026597
  9. ^ a b c d Eric Schuettpelz (2007). "table 1". The evolution and diversification of epiphytic ferns. Duke University PhD thesis. 
  10. ^ Stace, Clive (2010b). New Flora of the British Isles (3rd ed.). Cambridge, UK: Cambridge University Press. p. xxviii. ISBN 978-0-521-70772-5. 
  11. ^ Rai, Hardeep S. & Graham, Sean W. (2010). "Utility of a large, multigene plastid data set in inferring higher-order relationships in ferns and relatives (monilophytes)". American Journal of Botany 97 (9): 1444–1456. doi:10.3732/ajb.0900305. , p. 1450
  12. ^ Schuettpelz, Eric. "Fern Phylogeny Inferred from 400 Leptosporangiate Species and Three Plastid Genes," contained in "The Evolution and Diversification of Epiphytic Ferns." Doctoral dissertation, Duke University. 2007. http://dukespace.lib.duke.edu/dspace/bitstream/10161/181/1/D_Schuettpelz_Eric_a_052007.pdf
  13. ^ Walker, Matt (19 February 2010). "A mouse that eats ferns like a dinosaur". BBC Earth News. Retrieved 20 February 2010. 
  14. ^ "Stone Age humans liked their burgers in a bun", Sonia Van Gilder Cooke, New Scientist, 23 Oct. 2010, p. 18.
  15. ^ "Thirty thousand-year-old evidence of plant food processing" by Anna Revedin et al., PNAS, published online Oct. 18, 2010.
  16. ^ Pelton, Robert (2011). The Official Pocket Edible Plant Survival Manual. Freedom and Liberty Foundation Press. p. 25. BNID 2940013382145. 
  17. ^ * Boyd, Peter D. A. (2002-01-02). Pteridomania - the Victorian passion for ferns. Revised: web version. Antique Collecting 28, 6, 9–12. Retrieved 2007-10-02. 
  18. ^ May, Lenore Wile (1978). "The economic uses and associated folklore of ferns and fern allies". The Botanical Review 44 (4): 491–528. doi:10.1007/BF02860848. 
  19. ^ "Traditional Finnish Midsummer celebration". Saunalahti.fi. Retrieved 2013-09-07. 

Further reading[edit]

  • Lord, Thomas R. (2006). Ferns and Fern Allies of Pennsylvania. Indiana, PA: Pinelands Press. [2]
  • Melan, M. A., and D. P. Whittier. "Effects of Inorganic Nitrogen Sources on Spore Germination

and Gametophyte Growth in Botrychium Dissectum." Plant, Cell and Environment 13 (1990): 477-82. Web.

  • Moran, Robbin C. (2004). A Natural History of Ferns. Portland, OR: Timber Press. ISBN 0-88192-667-1.
  • Pryer, Kathleen M., Harald Schneider, Alan R. Smith, Raymond Cranfill, Paul G. Wolf, Jeffrey S. Hunt and Sedonia D. Sipes. 2001. Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants. Nature 409: 618–622 (abstract here [3]).
  • Pryer, Kathleen M., Eric Schuettpelz, Paul G. Wolf, Harald Schneider, Alan R. Smith and Raymond Cranfill. 2004. Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences. American Journal of Botany 91:1582–1598 (online abstract here [4]).

External links[edit]


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