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      A Brief Chronicle of the Genus Cordyceps Fr., the Oldest Valid Genus in Cordycipitaceae (Hypocreales, Ascomycota)

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          Abstract

          The earliest pre-Linnaean fungal genera are briefly discussed here with special emphasis on the nomenclatural connection with the genus Cordyceps Fr. Since its valid publication under the basidiomycetous genus Clavaria Vaill. ex L. ( Clavaria militaris L. Sp. Pl. 2:1182, 1753), the genus Cordyceps has undergone nomenclatural changes in the post-Linnaean era, but has stood firmly for approximately 200 years. Synonyms of Cordyceps were collected from different literature sources and analyzed based on the species they represent. True synonyms of Cordyceps Fr. were defined as genera that represented species of Cordyceps Fr. emend. G. H. Sung, J. M. Sung, Hywel-Jones & Spatafora. The most common synonyms of Cordyceps observed were Clavaria and Sphaeria Hall, reported in the 18th and in the first half of the 19th century, respectively. Cordyceps, the oldest genus in the Cordyceps s. s. clade of Cordycipitaceae, is the most preferred name under the "One Fungus = One Name" principle on priority bases.

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          Phylogenetic classification of Cordyceps and the clavicipitaceous fungi

          Cordyceps, comprising over 400 species, was historically classified in the Clavicipitaceae, based on cylindrical asci, thickened ascus apices and filiform ascospores, which often disarticulate into part-spores. Cordyceps was characterized by the production of well-developed often stipitate stromata and an ecology as a pathogen of arthropods and Elaphomyces with infrageneric classifications emphasizing arrangement of perithecia, ascospore morphology and host affiliation. To refine the classification of Cordyceps and the Clavicipitaceae, the phylogenetic relationships of 162 taxa were estimated based on analyses consisting of five to seven loci, including the nuclear ribosomal small and large subunits (nrSSU and nrLSU), the elongation factor 1α (tef1), the largest and the second largest subunits of RNA polymerase II (rpb1 and rpb2), β-tubulin (tub), and mitochondrial ATP6 (atp6). Our results strongly support the existence of three clavicipitaceous clades and reject the monophyly of both Cordyceps and Clavicipitaceae. Most diagnostic characters used in current classifications of Cordyceps (e.g., arrangement of perithecia, ascospore fragmentation, etc.) were not supported as being phylogenetically informative; the characters that were most consistent with the phylogeny were texture, pigmentation and morphology of stromata. Therefore, we revise the taxonomy of Cordyceps and the Clavicipitaceae to be consistent with the multi-gene phylogeny. The family Cordycipitaceae is validated based on the type of Cordyceps, C. militaris, and includes most Cordyceps species that possess brightly coloured, fleshy stromata. The new family Ophiocordycipitaceae is proposed based on Ophiocordyceps Petch, which we emend. The majority of species in this family produce darkly pigmented, tough to pliant stromata that often possess aperithecial apices. The new genus Elaphocordyceps is proposed for a subclade of the Ophiocordycipitaceae, which includes all species of Cordyceps that parasitize the fungal genus Elaphomyces and some closely related species that parasitize arthropods. The family Clavicipitaceae s. s. is emended and includes the core clade of grass symbionts (e.g., Balansia, Claviceps, Epichloë, etc.), and the entomopathogenic genus Hypocrella and relatives. In addition, the new genus Metacordyceps is proposed for Cordyceps species that are closely related to the grass symbionts in the Clavicipitaceae s. s. Metacordyceps includes teleomorphs linked to Metarhizium and other closely related anamorphs. Two new species are described, and lists of accepted names for species in Cordyceps, Elaphocordyceps, Metacordyceps and Ophiocordyceps are provided.
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            One Fungus = One Name: DNA and fungal nomenclature twenty years after PCR

            Some fungi with pleomorphic life-cycles still bear two names despite more than 20 years of molecular phylogenetics that have shown how to merge the two systems of classification, the asexual “Deuteromycota” and the sexual “Eumycota”. Mycologists have begun to flout nomenclatorial regulations and use just one name for one fungus. The International Code of Botanical Nomenclature (ICBN) must change to accommodate current practice or become irrelevant. The fundamental difference in the size of fungi and plants had a role in the origin of dual nomenclature and continues to hinder the development of an ICBN that fully accommodates microscopic fungi. A nomenclatorial crisis also looms due to environmental sequencing, which suggests that most fungi will have to be named without a physical specimen. Mycology may need to break from the ICBN and create a MycoCode to account for fungi known only from environmental nucleic acid sequence (i.e. ENAS fungi).
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              Fungal systematics: is a new age of enlightenment at hand?

              Fungal taxonomists pursue a seemingly impossible quest: to discover and give names to all of the world's mushrooms, moulds and yeasts. Taxonomists have a reputation for being traditionalists, but as we outline here, the community has recently embraced the modernization of its nomenclatural rules by discarding the requirement for Latin descriptions, endorsing electronic publication and ending the dual system of nomenclature, which used different names for the sexual and asexual phases of pleomorphic species. The next, and more difficult, step will be to develop community standards for sequence-based classification.
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                Author and article information

                Journal
                Mycobiology
                Mycobiology
                MB
                Mycobiology
                The Korean Society of Mycology
                1229-8093
                2092-9323
                June 2014
                30 June 2014
                : 42
                : 2
                : 93-99
                Affiliations
                [1 ]Institute of Life Science and Biotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
                [2 ]Ishikawa Prefectural University, Nonoichi 921-8836, Japan.
                [3 ]College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
                [4 ]Forest Biodiversity Division, Korea National Arboretum, Pocheon 487-820, Korea.
                [5 ]Mushroom Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Eumseong 369-873, Korea.
                Author notes
                Corresponding author: bhushan.shrestha@ 123456gmail.com (B.S.)
                Corresponding author: sung97330@ 123456gmail.com (G.-H.S.)
                Article
                10.5941/MYCO.2014.42.2.93
                4112243
                c46c11c0-f6ff-4ecc-bd68-26d2ba494ba9
                © The Korean Society of Mycology

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 11 February 2014
                : 22 April 2014
                : 02 May 2014
                Funding
                Funded by: Rural Development Administration
                Award ID: PJ009241
                Funded by: Korea National Arboretum
                Award ID: KNA 1-1-10
                Categories
                Mini-Review

                Plant science & Botany
                elaphocordyceps,fungal taxonomy,metacordyceps,one fungus = one name,ophiocordyceps

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