|Ophiocordyceps sinensis (left) growing out of the head of a dead caterpillar|
(Berk.) G.H.Sung, J.M.Sung, Hywel-Jones & Spatafora (2007)
Sphaeria sinensis Berk. (1843)
The fungus germinates in the living larva, kills and mummifies it, and then the stalk-like fruiting body emerges from the corpse. It is known in English colloquially as caterpillar fungus, or by its more prominent names Yartsa Gunbu (Tibetan: དབྱར་རྩྭ་དགུན་འབུ་, Wylie: dbyar rtswa dgun 'bu, literally "winter worm, summer grass"), or Dōng chóng xià cǎo (Chinese: 冬虫夏草). Of the various entomopathogenic fungi, Ophiocordyceps sinensis is one that has been used for at least 2000 years for its reputed abilities to treat many diseases related to lungs, kidney, and erectile dysfunction. This fungus is not yet cultivated commercially, despite the fact that several fermentable strains of Ophiocordyceps sinensis have been isolated by Chinese scientists. Overharvesting and overexploitation have led to the classification of O. sinensis as an endangered species in China. Additional research needs to be carried out in order to understand its morphology and growth habits for conservation and optimum utilization.
The hosts in which O. sinensis grows are ambiguously referred to as "ghost moths", which identifies either a single species or the genus Thitarodes: they may be one of several Thitarodes that live on the Tibetan Plateau (Tibet, Qinghai, West-Sichuan, SW-Gansu & NW Yunnan), and the Himalayas (India, Nepal, Bhutan).
O. sinensis is known in the West as a medicinal mushroom, and its use has a long history in traditional Chinese medicine as well as traditional Tibetan medicine. The hand-collected, intact fungus-caterpillar body is valued by herbalists and as a status symbol; it is used as an aphrodisiac and treatment for ailments such as fatigue and cancer, although such use is validated mainly by traditional Chinese medicine and anecdote, and evidenced-based research into its efficacy is lacking.
Taxonomic history and systematics
Similar to other Cordyceps species, O. sinensis consists of two parts, a fungal endosclerotium (caterpillar) and stroma. The stroma is the upper fungal part and is dark brown or black, but can be a yellow color when fresh and, longer than the caterpillar itself, usually 4–10 cm. It grows singly from the larval head, and is clavate, sublanceolate or fusiform and distinct from the stipe. The stipe is slender, glabrous, and longitudinally furrowed or ridged.
The fertile part of the stroma is the head. The head is granular because of the ostioles of the embedded perithecia. The perithecia are ordinally arranged and ovoid  The asci are cylindrical or slightly tapering at both ends, and may be straight or curved, with a capitate and hemispheroid apex and may be two to four spored. Similarly, ascospores are hyaline, filiform, multiseptate at a length of 5-12 μm and subattenuated on both sides. Perithecial, ascus and ascospore characters in the fruiting bodies are the key identification characteristics of O. sinensis.
Ophiocordyceps (Petch) Kobayasi species produce whole ascospores and do not separate into part spores which is different from other Cordyceps species, which produce either immersed or superficial perithecia perpendicular to stromal surface and the ascospores at maturity are disarticulated into part spores. Generally Cordyceps species possess brightly colored and fleshy stromata, but O. sinensis had dark pigments and tough to pliant stromata, a typical characteristic feature of most of the Ophiocordyceps species.
Developments in classification
The species was first described scientifically by Miles Berkeley in 1843 as Sphaeria sinensis; Pier Andrea Saccardo transferred the species to the genus Cordyceps in 1878. The scientific name's etymology is from the Latin cord "club", ceps "head", and sinensis "from China". The fungus was known as Cordyceps sinensis until 2007, when molecular analysis was used to emend the classification of the Cordycipitaceae and the Clavicipitaceae, resulting in the naming of a new family Ophiocordycipitaceae and the transfer of several Cordyceps species to Ophiocordyceps.
Based on a molecular phylogenetic study, Sung et al. (2007) separated the megagenus Cordyceps into four genera as it was polyphyletic, viz. Cordyceps (40 spp.), Ophiocordyceps (146 spp.), Metacordyceps (6 spp.) and Elaphocordyceps (21 spp.), while the remaining 175 spp. were left in Cordyceps.[contradictory] As a result, C. sinensis was transferred to Ophiocordyceps, hence renamed as O. sinensis.
In Tibet it is known as དབྱར་རྩྭ་དགུན་འབུ་ (Wylie: dbyar rtswa dgun 'bu, ZYPY: yarza g̈unbu, Lhasa dialect IPA: [jɑ̀ːt͡sɑ kỹ̀pu], "summer grass winter bug"), which is the source of the Nepali यार्चागुन्बू, yarshagumba, yarchagumba or yarsagumba. The transliteration in Bhutan is Yartsa Guenboob. It is known as keera jhar, keeda jadi, keeda ghas or 'ghaas fafoond in Nepali. Its name in Chinese Dōng chóng xià cǎo (冬蟲夏草) means "winter worm, summer grass" (i.e., "worm in the winter, [turns to] plant in the summer"). The Chinese name is a literal translation of the original Tibetan name, which was first recorded in the 15th century by the Tibetan doctor Zurkhar Namnyi Dorje. In colloquial Tibetan Yartsa gunbu is often shortened to simply "bu" or "yartsa".
In traditional Chinese medicine, its name is often abbreviated as chong cao (蟲草 "insect plant"), a name that also applies to other Cordyceps species, such as C. militaris. In Japanese, it is known by the Japanese reading of the characters for the Chinese name, tōchūkasō (冬虫夏草?).
The English term "vegetable caterpillar" is a misnomer, as no plant is involved. "Caterpillar fungus" is a preferable term.
Nomenclature of the anamorph
Since the 1980s, 22 species in 13 genera have been attributed to the anamorph of O. sinensis. Of the 22 species, Cephalosporium acreomonium is the zygomycetous species of Umbelopsis, Chrysosporium sinense has very low similarity in RAPD polymorphism, hence it is not the anamorph. Likewise, Cephalosporium dongchongxiacae, C. sp. sensu, Hirsutella sinensis and H. hepiali and Synnematium sinnense are synonymous and only H. sinensis is only validly published in articles. Cephalosporium sinensis possibly might be synonymous to H. sinensis but there is lack of valid information. Isaria farinose is combined to Paecilomyces farinosus and is not the anamorph. Several species like Isaria sp. Verticella sp. Scydalium sp. Stachybotrys sp. were identified only up to generic level, and thus it is dubious that they are anamorph. Mortierella hepiali is discarded as anamorph as it belongs to Zygomycota. Paecilomyces sinensis and Sporothrix insectorum are discarded based on the molecular evidence. P. lingi appeared only in one article and thus is discarded because of incomplete information. Tolypocladium sinense, P. hepiali, and Scydalium hepiali, have no valid information and thus are not considered as anamorph to Ophiocordyceps sinensis. V. sinensis is not considered anamorph as there is no valid published information. Similarly, Metarhizium anisopliae is not considered anamorph as it has widely distributed host range, and is not restricted only in high altitude. Thus Hirsutella sinensis is considered the validly published anamorph of O. sinensis. Cordyceps nepalensis and C. multiaxialis which had similar morphological characteristics to O. sinensis, also had almost identical or identical ITS sequences and its presumed anamorph, H. sinensis. This also confirms H. sinensis to be anamorph of O. sinensis and suggests C. nepalensis and C. multiaxialis are synonyms. Evidence based on microcyclic conidiation from ascospores and molecular studies  support H. sinensis as the anamorph of the caterpillar fungus, O. sinensis.
The caterpillars prone to infection by O. sinensis generally live 15 cm (5.9 in) underground  in alpine grass and shrub-lands on the Tibetan Plateau and the Himalayas at an altitude between 3,000 and 5,000 m (9,800 and 16,400 ft). The fungus is reported from the northern range of Nepal, Bhutan, and also from the northern states of India, apart from northern Yunnan, eastern Qinghai, eastern Tibet, western Sichuan, southwestern Gansu provinces.
The fungus consumes its host from inside out as they hibernate in alpine meadows. Usually the larvae are more vulnerable after shedding their skin, during late summer. The fungal fruiting body disperses spores which infect the caterpillar. The infected larvae tend to remain vertical to the soil surface with their heads up. The fungus then germinates in the living larva, kills and mummifies it, and then the stalk-like fruiting body emerges from the head and the fungus finally emerges from the soil by early spring. Fifty-seven taxa from several genera (37 Thitarodes, 1 Bipectilus, 1 Endoclita, 1 Gazoryctra, 3 Pharmacis, and 14 others not correctly identified to genus) are recognized as potential hosts of O. sinensis.
Ophiocordyceps sinensis has both teleomorphic and anamorphic phases. Spending up to five years underground before pupating, the Thitarodes caterpillar is attacked while feeding on roots. It is not certain how the fungus infects the caterpillar; possibly by ingestion of a fungal spore or by the fungus mycelium invading the insect through one of the insect's breathing pores. The dark brown to black fruiting body (or mushroom) emerges from the ground in spring or early summer, the long, usually columnar fruiting body reaches 5–15 cm above the surface and releases spores.
In late autumn, chemicals on the skin of the caterpillar interact with the fungal spores and release the fungal mycelia, which then infects the caterpillar. After invading a host larva, the fungus ramifies throughout the host and eventually kills it. Gradually the host larvae become rigid because of the production of fungal sclerotia. Fungal sclerotia are multihyphal structures that can remain dormant and then germinate to produce spores. After over-wintering, the fungus ruptures the host body, forming a sexual sporulating structure (a perithecial stroma) from the larval head in summer that is connected to the sclerotia (dead larva) below ground and grows upward to emerge from the soil. The slow growing O. sinensis grows at a comparatively low temperature, i.e., below 21 °C. Temperature requirements and growth rates are crucial factors that identify O. sinensis from other similar fungi.
Use in traditional Asian medicines
||This section needs more medical references for verification or relies too heavily on primary sources. (March 2015)|
The fungus is a medicinal mushroom which is highly prized by practitioners of Tibetan medicine, Chinese medicine and traditional folk medicines, in which it is used as a treatment for a variety of ailments; as a reputed curative for many diseases, anti-aging, hypoglycemic, aphrodisiac and also treatment against cancer. It has also been used to stimulate the immune system, and to treat kidney and lung problems, fatigue, respiratory disease, hyperglycemia, hyperlipidemia, asthenia after severe illness, arrhythmias and other heart diseases and liver disease.
Medicinal use of the caterpillar fungus apparently originated in Tibet and Nepal. So far the oldest known text documenting its use was written in the late 15th century by the Tibetan doctor Zurkhar Nyamnyi Dorje (Wylie: Zur mkhar mnyam nyid rdo rje)[1439-1475]) in his text: Man ngag bye ba ring bsrel ("Instructions on a Myriad of Medicines"). A translation is available at Winkler.
The first mention of Ophiocordyceps sinensis in traditional Chinese medicine was in Wang Ang’s 1694 compendium of materia medica, Ben Cao Bei Yao. In the 18th Century it was listed in Wu Yiluo's Ben cao cong xin ("New compilation of materia medica"). No sources have been published to uphold widespread claims of "thousands of years of use in Chinese medicine" or use of "chong cao since the 7th Century Tang dynasty in China". The ethno-mycological knowledge on caterpillar fungus among the Nepalese people is documented. The entire fungus-caterpillar combination is hand-collected for medicinal use.
In traditional Chinese medicine (TCM), it is regarded as having an excellent balance of yin and yang as it is considered to be composed of both an animal and a vegetable. They are now cultivated on an industrial scale for their use in TCM. However, no one has succeeded so far in rearing the fungus by infecting cultivated caterpillars; all products derived from cultured Ophiocordyceps are derived from mycelia grown on grains or in liquids.
According to Bensky et al. (2004), laboratory-grown O. sinensis mycelia have similar clinical efficacy and less associated toxicity. He notes a toxicity case of constipation, abdominal distension, and decreased peristalsis, two cases of irregular menstruation, and one case report of amenorrhea following ingestion of tablets or capsules containing O. sinensis. In Chinese medicine O. sinensis is considered sweet and warm, entering the lung and kidney channels; the typical dosage is 3–9 g.
Economics and impact
In rural Tibet, yartsa gunbu has become the most important source of cash income. The fungi contributed 40% of the annual cash income to local households and 8.5% to the GDP in 2004. Prices have increased continuously, especially since the late 1990s. In 2008, one kilogram traded for US$3,000 (lowest quality) to over US$18,000 (best quality, largest larvae). The annual production on the Tibetan Plateau was estimated in 2009 at 80–175 tons. The Himalayan Ophiocordyceps production might not exceed a few tons.
In 2004 the value of a kilogram of caterpillars was estimated at about 30,000 to 60,000 Nepali rupees in Nepal, and about Rs 100,000 in India. In 2011 the value of a kilogram of caterpillars was estimated at about 350,000 to 450,000 Nepali rupees in Nepal. A 2012 BBC article indicated that in north Indian villages a single fungus was worth Rs 150 (about £2 or $3), which is more than the daily wage of a manual labourer. In 2012, a pound of top-quality yartsa had reached retail prices of $50,000.
The price of Ophiocordyceps sinensis is reported to have dramatically on the Tibetan Plateau, basically 900% between 1998 and 2008, an annual average of over 20% (after inflation). However, the value of big sized caterpillar fungus has increased more dramatically than smaller size Cordyceps, regarded as lower quality.
|Year||% Price Increase||Price/kg (Yuan)|
|1997||467% (incl. inflation)||8,400|
|2004||429% (incl. inflation)||36,000|
Because of its high value, inter-village conflicts over access to its grassland habitats has become a headache for the local governing bodies and in several cases people were killed. In November 2011, a court in Nepal convicted 19 villagers over the murder of a group of farmers during a fight over the prized aphrodisiac fungus. Seven farmers were killed in the remote northern district of Manang in June 2009 after going to forage for Yarchagumba.
Its value gave it a role in the Nepalese Civil War, as the Nepalese Maoists and government forces fought for control of the lucrative export trade during the June–July harvest season. Collecting yarchagumba in Nepal had only been legalised in 2001, and now demand is highest in countries such as China, Thailand, Vietnam, Korea and Japan. By 2002, the herb was valued at R 105,000 ($1,435) per kilogram, allowing the government to charge a royalty of R 20,000 ($280) per kilogram.
The search for Ophiocordyceps sinensis is often perceived to pose a threat to the environment of the Tibetan Plateau where it grows. While it has been collected for centuries and is still common in such areas, current collection rates are much higher than in historical times.
Cultivated O. sinensis mycelium is an alternative to wild-harvested O. sinensis, and producers claim it may offer improved consistency. Artificial culture of O. sinensis is typically by growth of pure mycelia in liquid culture (in China) or on grains (in the West).
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|Wikimedia Commons has media related to Ophiocordyceps sinensis.|
|Wikispecies has information related to: Cordyceps sinensis|
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