Epipogium aphyllum

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Contents

Ghost orchid
Epipogium aphyllum plants.jpg
Habit
Epipogium aphyllum - Alutaguse.jpg
Ghost orchid flower
Status iucn3.1 LC.svg
Least Concern  (IUCN 3.1)(Europe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Genus: Epipogium
Species:
E. aphyllum
Binomial name
Epipogium aphyllum
Sw.
Synonyms

Satyrium epipogiumL.

Epipogium aphyllum, the ghost orchid, is a hardy mycoheterotrophic orchid lacking chlorophyll. [2] It is one of the rarest representatives of Orchidae family. [3]

It is famous for its unpredictable appearance; in many localities it has been seen just once. [4] It is found in beech, oak, pine, and spruce forests on base-rich soils. It is a rare and critically endangered plant in habitat, and is believed to be extinct throughout much of its former range, although it has been recently confirmed in the United Kingdom (2009), an area where the plants were believed to have gone extinct. [5]

The plants are protected in many locales, and removing the plants from habitat or disturbing the plants, even for scientific study, can be a very serious matter in many jurisdictions. These plants are exceptionally rare and should never be removed from habitat or disturbed. [6]

In 1926 the Welsh botanist Eleanor Vachell was asked by the British Museum to investigate a report of the ghost orchid in England. For many years the Welsh National Herbarium at Amgueddfa Cymru (National Museum of Wales) had only a small rhizome that had been gathered by Vachell on 29 May 1926. [5]

Biology

Epipogium aphyllum - Johvi.jpg

Once thought to be saprophytic, these hardy plants are actually obligate mycoheterotrophs (or epiparasites) that obtain nutrients from mycorrhizal networks involving basidiomycete fungi that are in turn associated with the roots of various species of coniferous trees. They grow from an underground, burrowing stem which lacks chlorophyll and possesses ephemeral leaves that are small scales. The plants only emerge above ground to flower, especially during very wet summers in Western Europe.

These plants harness an array of fungal symbionts across several families, often simultaneously. Analysis of these plants have identified ectomycorrhizal Inocybe species as exclusive symbionts for 75% of the plants in habitat, as well as others ( Hebeloma , Xerocomus , Lactarius and Thelephora ). [7] The plants also host ascomycete endophytes, which appear to assist the plant in parasitizing some of the plant's basidiomycete symbionts. [6]

The plants defy cultivation outside of laboratory conditions, as they require not only specific fungal symbionts, but also specific host trees with which these mushroom species form mycorrhizal relationships. Large plants of this species can produce a rather stunning woodland display with up to a dozen flower stalks at once bearing 3–4 flowers each growing out of coniferous leaf litter. [4]

The flowers are most likely pollinated by bumblebees; to reproduce, it produces numerous dust-like seeds that are dispersed by the wind over long distances. [7]

Chromosome number is often stated as 2n = 68, though one research article questions whether this value could be for a different Epipogium species. [8]

Researchers recently discovered in 2016 that a certain rare European Epipogium aphyllum displayed both forms of asexual and sexual reproduction. The study was conducted in northern Poland where a population was observed going through gametophyte development with unpollinated flower buds. [9]

Distribution

The plants have an extremely wide range of distribution. The species is widespread across much of the temperate zone in northern and central Europe, Russia [10] and northern Asia from Spain to Kamchatka and south the Himalayas. [3] [11] [12] There are hotspots of records ranging from the boreal regions of Scandinavia stretching as far south as the Pyrenees, the Vercors Massif, northern Greece, and Crimea. It was reported for the first time on Mount Željin in central Serbia for the first time in 2023; the estimated IUCN conservation status in Serbia is Endangered (EN). [13] In Asia, Epipogium aphyllum is considered vulnerable in Mongolia and endangered in both Japan and China; however in North and South Korea, it is not considered threatened. [14]

Although its conservation status, per the 2011 IUCN 3.1 assessment in Europe, was Least Concern (LC) due to its low risk of extinction, it is, however, exceptionally rare in habitat. It is protected or listed on the IUCN red list of nearly 56 countries. [7] The plants are all found in areas which typically experience cold winters. The plant's rhizomes are densely colonized by fungi bearing clamp-connections and dolipores, all basidiomycetes, gill or pore-forming mushroom species that are normally found growing in mycorrhizal association with the roots of coniferous trees.

Only in July does Epipogium aphyllum appear above ground in northwestern Russia. Late July and the early part of August are when the blossoming period occurs. Notably, isolated specimens have been known to blossom until September in exceptional cases. [3]

Related Research Articles

<span class="mw-page-title-main">Ericaceae</span> Heather family of flowering plants

The Ericaceae are a family of flowering plants, commonly known as the heath or heather family, found most commonly in acidic and infertile growing conditions. The family is large, with c. 4250 known species spread across 124 genera, making it the 14th most species-rich family of flowering plants. The many well known and economically important members of the Ericaceae include the cranberry, blueberry, huckleberry, rhododendron, and various common heaths and heathers.

<span class="mw-page-title-main">Orchid</span> Family of flowering plants in the order Asparagales

Orchids are plants that belong to the family Orchidaceae, a diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Orchids are cosmopolitan plants that are found in almost every habitat on Earth except glaciers. The world's richest diversity of orchid genera and species is found in the tropics.

<span class="mw-page-title-main">Mycorrhiza</span> Fungus-plant symbiotic association

A mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant's rhizosphere, its root system. Mycorrhizae play important roles in plant nutrition, soil biology, and soil chemistry.

<i>Dendrophylax lindenii</i> Species of orchid

Dendrophylax lindenii, the ghost orchid is a rare perennial epiphyte from the orchid family (Orchidaceae). It is native to Florida, the Bahamas, and Cuba. Other common names include palm polly and white frog orchid.

<i>Rhizanthella gardneri</i> Species of orchid plant

Rhizanthella gardneri, commonly known as western underground orchid, is a species of flowering plant in the orchid family and is endemic to the southwest of Western Australia. It is a herb that spends its entire life cycle, including flowering, at or below the soil surface. A head of up to 100 small reddish to cream-coloured, inward facing flowers surrounded by large, cream-coloured bracts with a horizontal rhizome is produced between May and July.

<i>Ophrys insectifera</i> Species of flowering plant in the orchid family Orchidaceae

Ophrys insectifera, the fly orchid, is a species of orchid and the type species of the genus Ophrys. It is remarkable as an example of the use of sexually deceptive pollination and floral mimicry, as well as a highly selective and highly evolved plant–pollinator relationship.

<span class="mw-page-title-main">Myco-heterotrophy</span> Symbiotism between certain parasitic plants and fungi

Myco-heterotrophy is a symbiotic relationship between certain kinds of plants and fungi, in which the plant gets all or part of its food from parasitism upon fungi rather than from photosynthesis. A myco-heterotroph is the parasitic plant partner in this relationship. Myco-heterotrophy is considered a kind of cheating relationship and myco-heterotrophs are sometimes informally referred to as "mycorrhizal cheaters". This relationship is sometimes referred to as mycotrophy, though this term is also used for plants that engage in mutualistic mycorrhizal relationships.

Ghost plant is a common name for several plants and may refer to:

<i>Arachnitis</i> Genus of flowering plants

Arachnitis uniflora, the sole species in the genus Arachnitis, is a non-photosynthetic plant species in the family Corsiaceae. This species is mycoheterotrophic, and it obtains carbon from mycorrhizal fungi of the family Glomeraceae which are associated to its roots.

<i>Cephalanthera austiniae</i> Species of flowering plant

Cephalanthera austiniae is a species of orchid known as the phantom orchid and snow orchid because the entire plant is white except for a few yellow markings on the flowers.

<i>Epipactis helleborine</i> Species of orchid

Epipactis helleborine, the broad-leaved helleborine, is a terrestrial species of orchid with a broad distribution. It is a long lived herb which varies morphologically with ability to self-pollinate.

<i>Epipactis palustris</i> Species of orchid

Epipactis palustris, the marsh helleborine, is a species of orchid native to Europe and Asia.

<i>Epipogium</i> Genus of orchids

Epipogium, commonly known as ghost orchids, is a genus of four species of terrestrial leafless orchids in the family Orchidaceae. Orchids in this genus have a fleshy, underground rhizome and a fleshy, hollow flowering stem with small, pale coloured, drooping, short-lived flowers with narrow sepals and petals. They are native to a region extending from tropical Africa to Europe, temperate and tropical Asia, Australia and some Pacific Islands.

<i>Dipodium variegatum</i> Species of orchid

Dipodium variegatum, commonly known as the slender hyacinth-orchid, or blotched hyacinth-orchid, is a leafless mycoheterotrophic orchid that is endemic to south-eastern Australia. It forms mycorrhizal relationships with fungi of the genus Russula.

<span class="mw-page-title-main">Monotropoideae</span> Subfamily of flowering plants in the heather family Ericaceae

Monotropoideae, sometimes referred to as monotropes, are a flowering plant subfamily in the family Ericaceae. Members of this subfamily are notable for their mycoheterotrophic and non-photosynthesizing or achlorophyllous characteristics.

<span class="mw-page-title-main">Eleanor Vachell</span> Welsh botanist

Eleanor Vachell (1879–1948) was a Welsh botanist who is remembered especially for her work identifying and studying the flora of Glamorgan and her connection with the National Museum of Wales where she was the first woman to be a member of its Council and Court of Governors. The museum now holds her botanical diary, notes, books, records and specimens.

Orchid mycorrhizae are endomycorrhizal fungi which develop symbiotic relationships with the roots and seeds of plants of the family Orchidaceae. Nearly all orchids are myco-heterotrophic at some point in their life cycle. Orchid mycorrhizae are critically important during orchid germination, as an orchid seed has virtually no energy reserve and obtains its carbon from the fungal symbiont.

<i>Rhizopogon salebrosus</i> Species of fungus

Rhizopogon salebrosus is a mushroom species within the Rhizopogon sub-genus Amylopogon. R.salebrosus is a monotropoid mycorrhiza that is of vital importance to the ecology of conifer forests, especially in the Pacific Northwest region of North America. Although it is native to North America, R. salebrosus has been found in Europe and its range is generally limited to mountainous regions with sufficient precipitation. The mycoheterotrophic plant, Pterospora andromedea is often found in an obligate association with R. salebrosus in western parts of the U.S. Eastern populations of P. andromedea are typically symbiotic with another Rhizopogon sub species, R. kretzerae.

<i>Bartholina burmanniana</i> Species of flowering plant

Bartholina burmanniana, the spider orchid, is a species of deciduous, geophytic, flowering plant in the family Orchidaceae. It is one of two species within the Bartholina genus, the other being B. etheliae. The species’ common name refers to its spreading and deeply cut lip that is said to resemble a spider's legs. It is native to the Eastern and the Western Cape Provinces of South Africa, flowering from the end of August to the middle of October and peaking in September. This is one of the species sometimes referred to as "spider orchid".

Vera Naomi Smith, also known as Vera Paul, was an English botanist and naturalist. She is noted for her discovery of the ghost orchid in 1931. In 1980, Paul received an OBE for her services to conservation.

References

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  2. UKTV Viewer Enquiries. Plants Behaving Badly. Murder and Mayhem. Blu-ray. UPC   4006448510039
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  4. 1 2 Juliette Jowit (March 8, 2010). "Ghost orchid comes back from extinction". The Guardian .
  5. 1 2 Ghost orchids - a fleeting occurrence in dark, shaded woods, 3 July 2013, Museum of Wales, retrieved 21 August 2016
  6. 1 2 Melanie Roy; Takahiro Yagame; Masahide Yamato; Koji Iwase; Christine Heinz; Antonella Faccio; Paola Bonfante; Marc-Andre Selosse (2009). "Ectomycorrhizal Inocybe species associate with the mycoheterotrophic orchid Epipogium aphyllum but not its asexual propagules". Annals of Botany . 104 (3): 595–610. doi:10.1093/aob/mcn269. PMC   2720653 . PMID   19155220.
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