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Based on seven- and three-gene datasets, we discuss four alternative approaches for a reclassification of <i>Fomitopsidaceae (Polyporales</i>, <i>Basidiomycota)</i>. After taking into account morphological diversity in the family, we argue in favour of distinguishing three genera only, <i>viz</i>. <i>Anthoporia</i>, <i>Antrodia</i> and <i>Fomitopsis</i>. <i>Fomitopsis</i> becomes a large genus with 128 accepted species, containing almost all former <i>Fomitopsis</i> spp. and most species formerly placed in <i>Antrodia</i>, <i>Daedalea</i> and <i>Laccocephalum</i>. Genera <i>Buglossoporus</i>, <i>Cartilosoma</i>, <i>Daedalea</i>, <i>Melanoporia</i>, <i>Neolentiporus</i>, alongside twenty others, are treated as synonyms of <i>Fomitopsis</i>. This generic scheme allows for morphologically distinct genera in <i>Fomitopsidaceae</i>, unlike other schemes we considered. We provide arguments for retaining <i>Fomitopsis</i> and suppressing earlier (<i>Daedalea</i>, <i>Caloporus</i>) or simultaneously published generic names (<i>Piptoporus</i>) considered here as its synonyms. Taxonomy of nine species complexes in the genus is revised based on ITS, ITS + <i>TEF1</i>, ITS + <i>TEF1</i> + <i>RPB1</i> and ITS + <i>TEF1</i> + <i>RPB2</i> datasets. In total, 17 species are described as new to science, 26 older species are reinstated and 26 currently accepted species names are relegated to synonymy. A condensed identification key for all accepted species in the genus is provided. <b>Taxonomic novelties: New species:</b> <i>Fomitopsis algumicola</i> Grebenc & Spirin, <i>F. caseosa</i> Vlasák & Spirin, <i>F. cupressicola</i> Vlasák, J. Vlasák Jr. & Spirin, <i>F. derelicta</i> Vlasák & Spirin, <i>F. dollingeri</i> Vlasák & Spirin, <i>F. fissa</i> Vlasák & Spirin, <i>F. lapidosa</i> Miettinen & Spirin, <i>F. lignicolor</i> Vlasák & Spirin, <i>F. maculosa</i> Miettinen & Spirin, <i>F. pannucea</i> Runnel & Spirin, <i>F. perhiemata</i> Viner & Spirin, <i>F. purpurea</i> Spirin & Ryvarden, <i>F. retorrida</i> Spirin & Kotiranta, <i>F. solaris</i> Rivoire, A.M. Ainsworth & Vlasák, <i>F. tristis</i> Miettinen & Spirin, <i>F. tunicata</i> Miettinen & Spirin, <i>F. visenda</i> Miettinen & Spirin. <b>New combinations:</b> <i>Fomitopsis aculeata</i> (Cooke) Spirin & Miettinen, <i>F. aethalodes</i> (Mont.) Spirin, <i>F. alaskana</i> (D.V. Baxter) Spirin & Vlasák, <i>F. albidoides</i> (A. David & Dequatre) Bernicchia & Vlasák, <i>F. amygdalina</i> (Berk. & Ravenel) Spirin & Vlasák, <i>F. angusta</i> (Spirin & Vlasák) Spirin & Vlasák, <i>F. atypa</i> (Lév.) Spirin & Vlasák, <i>F. caespitosa</i> (Murrill) Spirin & Miettinen, <i>F. calcitrosa</i> (Spirin & Miettinen) Spirin & Miettinen, <i>F. circularis</i> (B.K. Cui & Hai J. Li) Spirin, <i>F. concentrica</i> (G. Cunn.) M.D. Barrett, <i>F. cyclopis</i> (Miettinen & Spirin) Miettinen & Spirin, <i>F. dickinsii</i> (Berk. ex Cooke) Spirin, <i>F. elevata</i> (Corner) Spirin & Miettinen, <i>F. eucalypti</i> (Kalchbr.) Spirin, <i>F. ferrea</i> (Cooke) Spirin & Viner, <i>F. flavimontis</i> (Vlasák & Spirin) Vlasák & Spirin, <i>F. foedata</i> (Berk.) Spirin & Miettinen, <i>F. gilvidula</i> (Bres.) Spirin & Miettinen, <i>F. glabricystidia</i> (Ipulet & Ryvarden) Miettinen & Ryvarden, <i>F. globispora</i> (Ryvarden & Aime) Spirin, <i>F. hartmannii</i> (Cooke) M.D. Barrett & Spirin, <i>F. hyalina</i> (Spirin, Miettinen & Kotir.) Spirin & Miettinen, <i>F. hypoxantha</i> (Bres.) Spirin & Miettinen, <i>F. incana</i> (Lév.) Spirin & V. Malysheva, <i>F. infirma</i> (Renvall & Niemelä) Miettinen & Niemelä, <i>F. juniperina</i> (Murrill) Spirin & Vlasák, <i>F. kuzyana</i> (Pilát ex Pilát) Spirin & Vlasák, <i>F. leioderma</i> (Mont.) Spirin & Vlasak, <i>F. leucaena</i> (Y.C. Dai & Niemelä) Spirin & Miettinen, <i>F. luzonensis</i> (Murrill) Spirin & Miettinen, <i>F. maculatissima</i> (Lloyd) Spirin, <i>F. madronae</i> (Vlasák & Ryvarden) Vlasák & Ryvarden, <i>F. malicola</i> (Berk. & M.A. Curtis) Spirin, <i>F. marchionica</i> (Mont.) Spirin & Miettinen, <i>F. marianii</i> (Bres.) Spirin, Vlasák & Cartabia, <i>F. mellita</i> (Niemelä & Penttilä) Niemelä & Miettinen, <i>F. microcarpa</i> (B.K. Cui & Shun Liu) Spirin, <i>F. micropora</i> (B.K. Cui & Shun Liu) Spirin, <i>F. modesta</i> (Kuntze ex Fr.) Vlasák & Spirin, <i>F. monomitica</i> (Yuan Y. Chen) Spirin & Viner, <i>F. morganii</i> (Lloyd) Spirin & Vlasák, <i>F. moritziana</i> (Lév.) Spirin & Miettinen, <i>F. neotropica</i> (D.L. Lindner, Ryvarden & T.J. Baroni) Vlasák, <i>F. nigra</i> (Berk.) Spirin & Miettinen, <i>F. nivosella</i> (Murrill) Spirin & Vlasák, <i>F. oboensis</i> (Decock, Amalfi & Ryvarden) Spirin, <i>F. oleracea</i> (R.W. Davidson & Lombard) Spirin & Vlasák, <i>F. philippinensis</i> (Murrill) Spirin & Vlasák, <i>F. primaeva</i> (Renvall & Niemelä) Miettinen & Niemelä, <i>F. psilodermea</i> (Berk. & Mont.) Spirin & Vlasák, <i>F. pulverulenta</i> (Rivoire) Rivoire, <i>F. pulvina</i> (Pers.) Spirin & Vlasák, <i>F. pulvinascens</i> (Pilát ex Pilát) Niemelä & Miettinen, <i>F. quercina</i> (L.) Spirin & Miettinen, <i>F. ramentacea</i> (Berk. & Broome) Spirin & Vlasák, <i>F. renehenticii</i> (Rivoire, Trichies & Vlasák) Rivoire & Vlasák, <i>F. roseofusca</i> (Romell) Spirin & Vlasák, <i>F. sagraeana</i> (Mont.) Vlasák & Spirin, <i>F. sandaliae</i> (Bernicchia & Ryvarden) Bernicchia & Vlasák, <i>F. sclerotina</i> (Rodway) M.D. Barrett & Spirin, <i>F. serialiformis</i> (Kout & Vlasák) Vlasák, <i>F. serialis</i> (Fr.) Spirin & Runnel, <i>F. serrata</i> (Vlasák & Spirin) Vlasák & Spirin, <i>F. squamosella</i> (Bernicchia & Ryvarden) Bernicchia & Ryvarden, <i>F. stereoides</i> (Fr.) Spirin, <i>F. subectypa</i> (Murrill) Spirin & Vlasák, <i>F. substratosa</i> (Malençon) Spirin & Miettinen, <i>F. tropica</i> (B.K. Cui) Spirin, <i>F. tumulosa</i> (Cooke) M.D. Barrett & Spirin, <i>F. tuvensis</i> (Spirin, Vlasák & Kotir.) Spirin & Vlasák, <i>F. uralensis</i> (Pilát) Spirin & Miettinen, <i>F. ussuriensis</i> (Bondartsev & Ljub.) Spirin & Miettinen, <i>F. variiformis</i> (Peck) Vlasák & Spirin, <i>F. yunnanensis</i> (M.L. Han & Q. An) Spirin, <i>Daedaleopsis candicans</i> (P. Karst.) Spirin, <i>Megasporoporia eutelea</i> (Har. & Pat.) Spirin & Viner, <i>Neofomitella hemitephra</i> (Berk.) M.D. Barrett, <i>Pseudophaeolus soloniensis</i> (Dubois) Spirin & Rivoire, <i>P. trichrous</i> (Berk. & M.A. Curtis) Vlasák & Spirin. <b>New synonyms:</b> <i>Antrodia bondartsevae</i> Spirin, <i>A. huangshanensis</i> Y.C. Dai & B.K. Cui, <i>A. taxa</i> T.T. Chang & W.N. Chou, <i>A. wangii</i> Y.C. Dai & H.S. Yuan, <i>Antrodiella subnigra</i> Oba, Mossebo & Ryvarden, <i>Antrodiopsis</i> Audet, <i>Boletus quercinus</i> Schrad., <i>Brunneoporus</i> Audet, <i>Buglossoporus</i> Kotl. & Pouzar, <i>Buglossoporus eucalypticola</i> M.L. Han, B.K. Cui & Y.C. Dai, <i>Caloporus</i> P. Karst., <i>Cartilosoma</i> Kotlaba & Pouzar, <i>Coriolus clemensiae</i> Murrill, <i>C. cuneatiformis</i> Murrill, <i>C. hollickii</i> Murrill, <i>C. parthenius</i> Hariot & Pat., <i>C. rubritinctus</i> Murrill, <i>Daedalea</i> Pers., <i>Daedalea allantoidea</i> M.L. Han, B.K. Cui & Y.C. Dai, <i>D. americana</i> M.L. Han, Vlasák & B.K. Cui, <i>D. radiata</i> B.K. Cui & Hai J. Li, <i>D. rajchenbergiana</i> Kossmann & Drechsler-Santos, <i>D. sinensis</i> Lloyd, <i>Daedalella</i> B.K. Cui & Shun Liu, <i>Dentiporus</i> Audet, <i>Flavidoporia</i> Audet, <i>Fomes subferreus</i> Murrill, <i>Fomitopsis cana</i> B.K. Cui, Hai J. Li & M.L. Han, <i>F. caribensis</i> B.K. Cui & Shun Liu, <i>F. cystidiata</i> B.K. Cui & M.L. Han, <i>F. ginkgonis</i> B.K. Cui & Shun Liu, <i>F. iberica</i> Melo & Ryvarden, <i>F. incarnata</i> K.M. Kim, J.S. Lee & H.S. Jung, <i>F. subfeei</i> B.K. Cui & M.L. Han, <i>F. subtropica</i> B.K. Cui & Hai J. Li, <i>Fragifomes</i> B.K. Cui, M.L. Han & Y.C. Dai, <i>Leptoporus epileucinus</i> Pilát, <i>Melanoporia</i> Murrill, <i>Neoantrodia</i> Audet, <i>Neolentiporus</i> Rajchenb., <i>Nigroporus macroporus</i> Ryvarden & Iturr., <i>Niveoporofomes</i> B.K. Cui, M.L. Han & Y.C. Dai, <i>Pilatoporus</i> Kotl. & Pouzar, <i>Piptoporus</i> P. Karst., <i>Polyporus aurora</i> Ces., <i>P. durescens</i> Overh. ex J. Lowe, <i>P. griseodurus</i> Lloyd, <i>Poria incarnata</i> Pers., <i>Pseudoantrodia</i> B.K. Cui, Y.Y. Chen & Shun Liu, <i>Pseudofomitopsis</i> B.K. Cui & Shun Liu, <i>Ranadivia</i> Zmitr., <i>Rhizoporia</i> Audet, <i>Rhodofomes</i> Kotl. & Pouzar, <i>Rhodofomitopsis</i> B.K. Cui, M.L. Han & Y.C. Dai, <i>Rhodofomitopsis pseudofeei</i> B.K. Cui & Shun Liu, <i>R. roseomagna</i> Nogueira-Melo, A.M.S. Soares & Gibertoni, <i>Rubellofomes</i> B.K. Cui, M.L. Han & Y.C. Dai, <i>Subantrodia</i> Audet, <i>Trametes fulvirubida</i> Corner, <i>T. lignea</i> Murrill, <i>T. lusor</i> Corner, <i>T. pseudodochmia</i> Corner, <i>T. subalutacea</i> Bourdot & Galzin, <i>T. supermodesta</i> Ryvarden & Iturr., <i>T. tuberculata</i> Bres., <i>Tyromyces multipapillatus</i> Corner, <i>T. ochraceivinosus</i> Corner, <i>T. palmarum</i> Murrill, <i>T. singularis</i> Corner, <i>T. squamosellus</i> Núñez & Ryvarden, <i>Ungulidaedalea</i> B.K. Cui, M.L. Han & Y.C. Dai. <b>Lectotypes:</b> <i>Hexagonia sulcata</i> Berk., <i>Polyporus castaneae</i> Bourdot & Galzin, <i>Poria incarnata</i> Pers., <i>Trametes subalutacea</i> Bourdot & Galzin, <i>Ungulina substratosa</i> Malençon. <b>Neotypes:</b> <i>Agaricus soloniensis</i> Dubois, <i>Boletus pulvinus</i> Pers. <b>Citation:</b> Spirin V, Runnel K, Vlasák J, Viner I, Barrett MD, Ryvarden L, Bernicchia A, Rivoire B, Ainsworth AM, Grebenc T, Cartabia M, Niemelä T, Larsson K-H, Miettinen O (2024). The genus <i>Fomitopsis</i> (<i>Polyporales, Basidiomycota</i>) reconsidered. <i>Studies in Mycology</i> <b>107</b>: 149-249. doi: 10.3114/sim.2024.107.03.