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Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative taxa from environmental DNA sequences), have been submitted to be voted on at the 11th International Mycological Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among taxa and find that alleles may not consistently and uniquely represent the species within which they are contained. Should the proposals be accepted, the meaning of nomenclatural types would change in a fundamental way from physical objects as sources of data to the data themselves. Such changes are conducive to irreproducible science, the potential typification on artefactual data, and massive creation of names with low information content, ultimately causing nomenclatural instability and unnecessary work for future researchers that would stall future explorations of fungal diversity. We conclude that the acceptance of DNA sequences alone as types of names of taxa, under the terms used in the current proposals, is unnecessary and would not solve the problem of naming putative taxa known only from DNA sequences in a scientifically defensible way. As an alternative, we highlight the use of formulas for naming putative taxa (candidate taxa) that do not require any modification of the ICN. Publisher’s Note A first version of this text was prepared by the first eight authors and the last one, given here. The other listed co-authors in the article PDF support the content, and their actual contributions varied from only support to additions that substantially improved the content. The full details of all co-authors, with their affiliations, are included in Supplementary Table 1 after p.175 of the article for reasons of clarity and space. Slavomír Adamčík Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, 845 23 Bratislava, Slovakia Teuvo Ahti Finnish Museum of Natural History, P.O. Box 7, 00014 University of Helsinki, Finland M. Catherine Aime Purdue University, 915 W. State St., West Lafayette, Indiana 47907, U.S.A. A. Martyn Ainsworth Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, United Kingdom László Albert Hungarian Mycological Society, 1087 Könyves Kálmán krt. 40, Budapest, Hungary Edgardo Albertó Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús, Universidad Nacional de San Martin-Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Alberto Altés García Facultad de Biología, Ciencias Ambientales y Química, Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain Dmitry Ageev SIGNATEC Ltd., 630090, Novosibirsk, Akademgorodok (Novosibirsk Scientific Center), Inzhenernaya str., 22, Russia Reinhard Agerer Ludwig-Maximilians-Universität München, Menzinger Str. 67, 80638 München, Germany Begona Aguirre-Hudson Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, United Kingdom Joe Ammirati University of Washington, Seattle, Washington 98195-1800, U.S.A. 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Moscoso, Apartado 21-9, Santo Domingo, Dominican Republic Vladimír Antonín Moravian Museum, Zeny trh 6, 659 37 Brno, Czech Republic Takayuki Aoki Genetic Resources Center, National Agriculture and Food Research Organization, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan André Aptroot ABL Herbarium, G.v.d.Veenstraat 107, 3762 XK Soest, The Netherlands Didier Argaud 40 rue du Justemont, 57290 Fameck, France Blanca Imelda Arguello Sosa Instituto Tecnológico de Ciudad Victoria, Tecnológico Nacional de México, Ciudad Victoria, Tamaulipas, Mexico Arne Aronsen Torødveien 54, 3135 Torød, Norway Ulf Arup Biological Museum, Lund University, Box 117, 221 00 Lund, Sweden Bita Asgari Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization, Tehran, Iran Boris Assyov Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Str., 1113 Sofia, Bulgaria Violeta Atienza Facultad de Ciencias Biológicas, Universitat de València, C/Dr Moliner 50, 46100, Burjasot, Valencia, Spain Ditte Bandini Panoramastr 47, 69257 Wiesenbach, Germany João Luís Baptista-Ferreira Instituto de Biossistemas e Ciências Integrativas, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal Hans-Otto Baral Blaihofstr. 42, 72074 Tübingen, Germany Tim Baroni The State University of New York, 340 Bowers Hall, P.O. 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Alexandre Ferronato, 1200, Setor Industrial, Sinop, Mato Grosso, Brazil Cristina Rodriguez-Caycedo UT Southwestern Medical Center, Dallas, Texas 75390, U.S.A. Pamela Rodriguez-Flakus W. Szafer Institute of Botany, Polish Academy of Sciences, Lubicz 46, 31-512 Krakow, Poland Anna Ronikier W. Szafer Institute of Botany, Polish Academy of Sciences, Lubicz 46, 31-512 Krakow, Poland Luis Rubio Casas Ul. Andrieja Sacharowa 1/1, 30-806 Kraków, Poland Katerina Rusevska Institute of Biology, Faculty of Natural Science and Mathematics, Ss. Cyril and Methodius University, Arhimedova 5, 1000 Skopje, Republic of Macedonia Günter Saar Dammenmühle 7, 77933 Lahr-Sulz, Germany Irja Saar Institute of Ecology and Earth Sciences, 40 Lai Street, Tartu 51005, Estonia Isabel Salcedo University of the Basque Country (UPV/EHU), Apdo 644, 48080 Bilbao, Spain Sergio M. Salcedo Martínez Facultad de Ciencias Biológicas, UANL. Ave. Pedro de Alba s/n esq. Manuel Barragán Cd. 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Mattioli 25, 10125, Torino, Italy Hermann Voglmayr University of Vienna, Rennweg 14, 1030 Vienna, Austria Sergey Volobuev Komarov Botanical Institute of the Russian Academy of Sciences, 2 Prof. Popov Street, St. Petersburg, 197376, Russia Wolfgang von Brackel Kirchenweg 2, 91341 Röttenbach, Germany Elena Voronina Lomonosov Moscow State University, Biology Faculty, Moscow, Russia Grit Walther Arvid-Harnack-Str. 4, 07743 Jena, Germany Roy Watling Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, United Kingdom Evi Weber Blaihofstr. 42, 72074 Tübingen, Germany Mats Wedin Swedish Museum of Natural History, P.O. Box 50007, 104 05 Stockholm, Sweden Øyvind Weholt Nord University, Nesna, 8700 Nesna, Norway Martin Westberg Museum of Evolution, Uppsala University, Norbyvägen 16, 75236 Uppsala, Sweden Eugene Yurchenko Polessky State University, Dnyaprouskai flatylii str. 23, 225710, Pinsk, Belarus Petr Zehnálek Faculty of Science, Charles University, Benátská 2, 128 01 Praha 2, Czech Republic Huang Zhang Kunming University of Science & Technology, Kunming, China Mikhail P. Zhurbenko Komarov Botanical Institute of the Russian Academy of Sciences, 2 Prof. Popov Street, St. Petersburg, 197376, Russia The following institutions are also supporting the present text (institutional support means that committees from the mentioned) Asociación Micológica Carlos Spegazzini (Argentina) Austrian Mycological Society (Austria) Croatian Mycological Society (Croatia) Committee of the Czech Scientific Society for Mycology (Czech Republic) The Netherlands Mycological Society (The Netherlands) Sociedad Española de Liquenología (Portugal/Spain) Iberian Mycological Society (which is under constitution, Portugal/Spain) Federación de Asociaciones Micológicas Andaluzas (FAMA) (Spain) Asociación Botánica y Micológica de Jaén (Spain) Asociación Micológica Hispalense Muscaria (Spain) Societat Micològica Valenciana (Spain)

Novel species of fungi described in this study include those from various countries as follows: Angola, Gnomoniopsis angolensis and Pseudopithomyces angolensis on unknown host plants. Australia, Dothiora corymbiae on Corymbia citriodora, Neoeucasphaeria eucalypti (incl. Neoeucasphaeria gen. nov.)on Eucalyptus sp., Fumagopsis stellae on Eucalyptus sp., Fusculina eucalyptorum (incl. Fusculinaceae fam. nov.) on Eucalyptus socialis, Harknessia corymbiicola on Corymbia maculata, Neocelosporium eucalypti (incl. Neocelosporium gen. nov., Neocelosporiaceae fam. nov. and Neocelosporiales ord. nov.) on Eucalyptus cyanophylla, Neophaeomoniella corymbiae on Corymbia citriodora, Neophaeomoniella eucalyptigena on Eucalyptus pilularis, Pseudoplagiostoma corymbiicola on Corymbia citriodora, Teratosphaeria gracilis on Eucalyptus gracilis, Zasmidium corymbiae on Corymbia citriodora. Brazil, Calonectria hemileiae on pustules of Hemileia vastatrix formed on leaves of Coffea arabica, Calvatia caatinguensis on soil, Cercospora solani-betacei on Solanum betaceum, Clathrus natalensis on soil, Diaporthe poincianellae on Poincianella pyramidalis, Geastrum piquiriunense on soil, Geosmithia carolliae on wing of Carollia perspicillata, Henningsia resupinata on wood, Penicillium guaibinense from soil, Periconia caespitosa from leaf litter, Pseudocercospora styracina on Styrax sp., Simplicillium filiforme as endophyte from Citrullus lanatus, Thozetella pindobacuensis on leaf litter, Xenosonderhenia coussapoae on Coussapoa floccosa., Canary Islands (Spain), Orbilia amarilla on Euphorbia canariensis. Cape Verde Islands, Xylodon jacobaeus on Eucalyptus camaldulensis. Chile, Colletotrichum arboricola on Fuchsia magellanica. Costa Rica, Lasiosphaeria miniovina ontreebranch. Ecuador, Ganoderma chocoense ontreetrunk. France, Neofitzroyomyces nerii (incl. Neofitzroyomyces gen. nov.) on Nerium oleander. Ghana, Castanediella tereticornis on Eucalyptus tereticornis, Falcocladium africanum on Eucalyptus brassiana, Rachicladosporium corymbiae on Corymbia citriodora. Hungary, Entoloma silvae-frondosae in Carpinus betulus-Pinus sylvestris mixedforest. Iran, Pseudopyricularia persiana on Cyperus sp. Italy, Inocybe roseascens onsoilinmixedforest. Laos, Ophiocordyceps houaynhangensis on Coleoptera larva. Malaysia, Monilochaetes melastomae on Melastoma sp. Mexico, Absidia terrestris fromsoil. Netherlands, Acaulium pannemaniae, Conioscypha boutwelliae, Fusicolla septimanifiniscientiae, Gibellulopsis simonii, Lasionectria hilhorstii, Lectera nordwiniana, Leptodiscella rintelii, Parasarocladium debruynii and Sarocladium dejongiae (incl. Sarocladiaceae fam. nov.) fromsoil. New Zealand, Gnomoniopsis rosae on Rosa sp. and Neodevriesia metrosideri on Metrosideros sp. Puerto Rico, Neodevriesia coccolobae on Coccoloba uvifera, Neodevriesia tabebuiae and Alfaria tabebuiae on Tabebuia chrysantha . Russia, Amanita paludosa on bogged soil in mixed deciduous forest, Entoloma tiliae in forest of Tilia × europaea, Kwoniella endophytica on Pyrus communis., South Africa, Coniella diospyri on Diospyros mespiliformis, Neomelanconiella combreti (incl. Neomelanconiellaceae fam. nov. and Neomelanconiella gen. nov.)on Combretum sp., Polyphialoseptoria natalensis on unidentified plant host, Pseudorobillarda bolusanthi on Bolusanthus speciosus, Thelonectria pelargonii on Pelargonium sp. Spain, Vermiculariopsiella lauracearum and Anungitopsis lauri on Laurus novocanariensis, Geosmithia xerotolerans from a darkened wall of a house, Pseudopenidiella gallaica on leaf litter. Thailand, Corynespora thailandica on wood, Lareunionomyces loeiensis on leaf litter, Neocochlearomyces chromolaenae (incl. Neocochlearomyces gen. nov.) on Chromolaena odorata, Neomyrmecridium septatum (incl. Neomyrmecridium gen. nov .), Pararamichloridium caricicola on Carex sp., Xenodactylaria thailandica (incl. Xenodactylariaceae fam. nov. and Xenodactylaria gen. nov.), Neomyrmecridium asiaticum and Cymostachys thailandica fromunidentifiedvine. USA, Carolinigaster bonitoi (incl. Carolinigaster gen. nov.)fromsoil, Penicillium fortuitum from house dust, Phaeotheca shathenatiana (incl. Phaeothecaceae fam. nov.) from twig and cone litter, Pythium wohlseniorum from stream water, Superstratomyces tardicrescens from human eye, Talaromyces iowaense from officeair. Vietnam, Fistulinella olivaceoalba onsoil. Morphological and culture characteristics along with DNA barcodes are provided Novel species of fungi described in this study include those from various countries as follows: Angola, Gnomoniopsis angolensis and Pseudopithomyces angolensis on unknown host plants. Australia, Dothiora corymbiae on Corymbia citriodora, Neoeucasphaeria eucalypti (incl. Neoeucasphaeria gen. nov.)on Eucalyptus sp., Fumagopsis stellae on Eucalyptus sp., Fusculina eucalyptorum (incl. Fusculinaceae fam. nov.) on Eucalyptus socialis, Harknessia corymbiicola on Corymbia maculata, Neocelosporium eucalypti (incl. Neocelosporium gen. nov., Neocelosporiaceae fam. nov. and Neocelosporiales ord. nov.) on Eucalyptus cyanophylla, Neophaeomoniella corymbiae on Corymbia citriodora, Neophaeomoniella eucalyptigena on Eucalyptus pilularis, Pseudoplagiostoma corymbiicola on Corymbia citriodora, Teratosphaeria gracilis on Eucalyptus gracilis, Zasmidium corymbiae on Corymbia citriodora. Brazil, Calonectria hemileiae on pustules of Hemileia vastatrix formed on leaves of Coffea arabica, Calvatia caatinguensis on soil, Cercospora solani-betacei on Solanum betaceum, Clathrus natalensis on soil, Diaporthe poincianellae on Poincianella pyramidalis, Geastrum piquiriunense on soil, Geosmithia carolliae on wing of Carollia perspicillata, Henningsia resupinata on wood, Penicillium guaibinense from soil, Periconia caespitosa from leaf litter, Pseudocercospora styracina on Styrax sp., Simplicillium filiforme as endophyte from Citrullus lanatus, Thozetella pindobacuensis on leaf litter, Xenosonderhenia coussapoae on Coussapoa floccosa., Canary Islands (Spain), Orbilia amarilla on Euphorbia canariensis. Cape Verde Islands, Xylodon jacobaeus on Eucalyptus camaldulensis. Chile, Colletotrichum arboricola on Fuchsia magellanica. Costa Rica, Lasiosphaeria miniovina ontreebranch. Ecuador, Ganoderma chocoense ontreetrunk. France, Neofitzroyomyces nerii (incl. Neofitzroyomyces gen. nov.) on Nerium oleander. Ghana, Castanediella tereticornis on Eucalyptus tereticornis, Falcocladium africanum on Eucalyptus brassiana, Rachicladosporium corymbiae on Corymbia citriodora. Hungary, Entoloma silvae-frondosae in Carpinus betulus-Pinus sylvestris mixedforest. Iran, Pseudopyricularia persiana on Cyperus sp. Italy, Inocybe roseascens onsoilinmixedforest. Laos, Ophiocordyceps houaynhangensis on Coleoptera larva. Malaysia, Monilochaetes melastomae on Melastoma sp. Mexico, Absidia terrestris fromsoil. Netherlands, Acaulium pannemaniae, Conioscypha boutwelliae, Fusicolla septimanifiniscientiae, Gibellulopsis simonii, Lasionectria hilhorstii, Lectera nordwiniana, Leptodiscella rintelii, Parasarocladium debruynii and Sarocladium dejongiae (incl. Sarocladiaceae fam. nov.) fromsoil. New Zealand, Gnomoniopsis rosae on Rosa sp. and Neodevriesia metrosideri on Metrosideros sp. Puerto Rico, Neodevriesia coccolobae on Coccoloba uvifera, Neodevriesia tabebuiae and Alfaria tabebuiae on Tabebuia chrysantha., Russia, Amanita paludosa on bogged soil in mixed deciduous forest, Entoloma tiliae in forest of Tilia × europaea, Kwoniella endophytica on Pyrus communis. South Africa, Coniella diospyri on Diospyros mespiliformis, Neomelanconiella combreti (incl. Neomelanconiellaceae fam. nov. and Neomelanconiella gen. nov.)on Combretum sp., Polyphialoseptoria natalensis on unidentified plant host, Pseudorobillarda bolusanthi on Bolusanthus speciosus, Thelonectria pelargonii on Pelargonium sp. Spain, Vermiculariopsiella lauracearum and Anungitopsis lauri on Laurus novocanariensis, Geosmithia xerotolerans from a darkened wall of a house, Pseudopenidiella gallaica on leaf litter. Thailand, Corynespora thailandica on wood, Lareunionomyces loeiensis on leaf litter, Neocochlearomyces chromolaenae (incl. Neocochlearomyces gen. nov.) on Chromolaena odorata, Neomyrmecridium septatum (incl. Neomyrmecridium gen. nov .), Pararamichloridium caricicola on Carex sp., Xenodactylaria thailandica (incl. Xenodactylariaceae fam. nov. and Xenodactylaria gen. nov.), Neomyrmecridium asiaticum and Cymostachys thailandica fromunidentifiedvine. USA, Carolinigaster bonitoi (incl. Carolinigaster gen. nov.)fromsoil, Penicillium fortuitum from house dust, Phaeotheca shathenatiana (incl. Phaeothecaceae fam. nov.) from twig and cone litter, Pythium wohlseniorum from stream water, Superstratomyces tardicrescens from human eye, Talaromyces iowaense from officeair. Vietnam, Fistulinella olivaceoalba onsoil. Morphological and culture characteristics along with DNA barcodes are provided., Tatiana M. Bulyonkova and colleagues are grateful to Dr Rodham Tulloss for his patient guidance and help, and to Dr Torbjørn Borgen Lindhardt for his invaluable advice. Thays G.L. Oliveira, Maria T.C. Felipe, Jadson D.P. Bezerra and Oliane M. C. Magalhães acknowledge financial support and/or scholarships from the CAPES (Finance Code 001), CNPq and FACEPE. Aline O.B. da Cunha, Alexandre R. Machado, Eder Barbier, Enrico Bernard and Cristina M. Souza-Motta acknowledge financial support and/or scholarships from the CAPES (Finance Code 001), CNPq, FACEPE, CECAV and ICMBio from Brazil. Rejane M.F. da Silva and colleagues express their gratitude to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for a scholarship to Rejane M.F. da Silva and to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for a research fellowships and/or financial support to Gladstone A. da Silva, Cristina M. Souza-Motta, José L. Bezerra and Rafael J.V. de Oliveira (Processes 458622/2014-1 and 312186/2016-9). Olinto L. Pereira, Vanessa P. Abreu, Jackeline P. Andrade and colleagues would like to thank the CNPq, CAPES and FAPEMIG for financial support. The study of Olga V. Morozova was carried out within the framework of a research project of the Komarov Botanical Institute RAS ‘Herbarium funds of the BIN RAS’ (АААА-А18-118022090078-2) with the support of the molecular work by the Russian Foundation for the Basic Research (project no. 15-29-02622). Anna M. Glushakova and Aleksey V. Kachalkin were supported by the Russian Foundation for Basic Research (RFBR), project no. 16-04-00624a. Janet Jennifer Luangsa-ard and colleagues were supported by ‘The Promotion Project on Science, Technology and Innovation Collaboration with ASEAN Member Countries under the Office of International Cooperation, MOSTThailand’. They would also like to thank Ms Duangkaew Chongkachornphong, Ms Papawee Nupason (International Cooperation Section, BIOTEC) and Ms Bakeo Souvannalath (Director of Biotechnology Division, Biotechnology and Ecology Institute, BEI) for their kind cooperation. Javier Fernández-López and colleagues are grateful to Marian Glenn for checking the text, and were supported by DGICT projects CGL2012-35559 and CGL2015-67459-P., Javier Fernández-López was also supported by Predoctoral Grants (BES- 2013-066429) from the Ministerio de Economía y Competitividad (Spain). Maria E. Ordoñez and colleagues acknowledge Pontificia Universidad Católica del Ecuador for financial support for project M13415. Taimy Cantillo is thankful to PEC-PG/CAPES for the PhD grant (proc. 12636134/2014) (Finance Code 001) and to the International Association for Plant Taxonomy (IAPT) for the Research Grant. Luis F.P. Gusmão is grateful to CNPq for Grant support (Proc. 303062/2014-2). Hugo Madrid was partially funded by Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT), Chile, project no. 11140562. Tor Erik Brandrud, Bálint Dima, Machiel E. Noordeloos and Egil Bendiksen thank the financial support of the Norwegian Taxonomy Initiative, with funding from the Norwegian Biodiversity Information Centre (NBIC), The Austrian Entoloma material (by Irmgard Krisai-Greilhuber) was sequenced within ABOL, subproject HRSFM University of Vienna, supported by the Austrian Federal Ministry of Education, Science and Research. Adriene M. Soares and colleagues would like to thank the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) and the Instituto Brasileiro de Meio Ambiente (IBAMA) for support during field trips and R.L.M. Alvarenga for the figures. They also acknowledge CAPES for the Ph.D. scholarship of Adriene M. Soares, and CNPq (307601/2015-3), CAPES (CAPES-SIU 008/13), and FACEPE (APQ-0375-2.03/15) for financial support. Angus J. Carnegie acknowledges support from the Forestry Corporation of NSW, and David Sargeant for assistance with site photos. Adel Pordel and colleagues thank the University of Tehran for financial support. Luis Quijada acknowledges support from ‘Fundación Ramón Areces’. Robert W. Barreto and colleagues thank the World Coffee Research/Texas Agrilife for financial support, as well as the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). Sara Salcedo-Sarmiento was supported by the ‘Programa de Estudante-Convênio de Pós-Graduação’ (PEC-PG) from CAPES. The research of Cobus M. Visagie and Keith A. Seifert was supported by grants from the Alfred P. Sloan Foundation Program on the Microbiology of the Built Environment. Blaise A. Darvaux acknowledges Keith A. Seifert for help with identification, Nicholas Mauriello for validating the Latin name, Mauricia Lawrence and Meagan Tillotson for help with material preparation. We are grateful to Gavin Phillips, Seed Bank Officer, Australian Botanic Garden, Mt Annan for field assistance and identification of plant species collected in New South Wales, Australia. Collection of specimens from Mungo National Park was supported by the ABRS Bush Blitz program, a partnership between the Australian Government, BHP and Earthwatch Australia. The National Geographic Okavango Wilderness Project is acknowledged for assistance and funding to J. Roux for material collected in Angola.