Abortiporus Murrill, 1904 (basis of record)
Abrothallus G. De Notaris, 1845 (basis of record)
Acarosporina M.A. Sherwood, 1977 (basis of record)
Acaulopage Drechsler, 1935 (basis of record)
Acaulospora J.W. Gerdemann & J.M. Trappe, 1974 (basis of record)
Achlya C.G.D. Nees in Carus, 1823 (basis of record)
Achlyogeton Schenk, 1859 (basis of record)
Achlyopsis De Wildeman, 1896 accepted as Pythiogeton M. von Minden in Falck, 1916 (basis of record)
Actinobotrys H. Hoffmann, 1856 accepted as Bremia Regel, 1843 (basis of record)
Actinocephalum Saito, 1905 accepted as Cunninghamella Matruchot, 1903 (basis of record)
Actinomortierella T.V. Chalabuda, 1968 accepted as Mortierella E. Coemans, 1863 (basis of record)
Adlerocystis Feldmann-Muhsam & Havivi, 1963 (basis of record)
Aenigmatospora R.F. Castañeda Ruiz, Saikawa, Guarro & Calduch, 1999 (basis of record)
Aeruginospora F. von Höhnel, 1908 (basis of record)
Agaricochaete Eichelbaum, 1906 (basis of record)
Agaricostilbum J.E. Wright, 1970 (basis of record)
Agaricus Linnaeus, 1753 (basis of record)
Agrocybe Fayod, 1889 (basis of record)
Agrogaster D.A. Reid, 1986 (basis of record)
Alacrinella J.-F. Manier & R. Ormières ex J.-F. Manier, 1968 (basis of record)
Albugo (Persoon) H.F.A. Roussel, 1806 (basis of record)
Allantomyces M.C. Williams & R.W. Lichtwardt, 1993 (basis of record)
Allarthonia A. Zahlbruckner in Engler & Prantl, 1903 accepted as Arthonia E. Acharius, 1806 (basis of record)
Allarthoniomyces E.A. Thomas, 1939 accepted as Arthonia E. Acharius, 1806 (basis of record)
Allarthotheliomyces Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (basis of record)
Allarthothelium (Vainio) A. Zahlbruckner in Engler & Prantl, 1908 accepted as Arthonia E. Acharius, 1806 (basis of record)
Allochytridium Salkin, 1970 accepted as Allochytrium A.B. Doweld, 2013 (basis of record)
Allomyces E.J. Butler, 1911 (basis of record)
Allopsalliota M.M. Nauta & C. Bas in M.M. Nauta, 1999 (basis of record)
Alnicola Kühner, 1926 accepted as Naucoria (E.M. Fries) P. Kummer, 1871 (basis of record)
Alternaria Nees ex Wallroth, 1816 (basis of record)
Althornia E.B.G. Jones & D.J. Alderman, 1972 (basis of record)
Alyxoria S.F. Gray, 1821 accepted as Opegrapha E. Acharius, 1809 (basis of record)
Amanita Persoon, 1797 (basis of record)
Amanitopsis Roze, 1876 accepted as Amanita Persoon, 1797 (basis of record)
Ameropeltomyces Batista & H. Maia, 1967 accepted as Arthonia E. Acharius, 1806 (basis of record)
Amoebochytrium Zopf, 1884 (basis of record)
Amoebophilus P.A. Dangeard, 1910 (basis of record)
Amparoina Singer, 1958 (basis of record)
Amphilomopsis A. Jatta, 1905 accepted as Chrysothrix Montagne, 1852 (basis of record)
Amylascus Trappe, 1971 (basis of record)
Amyloflagellula Singer, 1966 (basis of record)
Anastrophella E. Horak & D.E. Desjardin, 1994 (basis of record)
Ancistroporella G. Thor, 1994 accepted as Ancistrosporella G. Thor, 1995 (basis of record)
Ancistroporella G. Thor, 1994 accepted as Ancistrosporella G. Thor, 1995 (extant flag source)
Ancistroporella G. Thor, 1994 accepted as Ancistrosporella G. Thor, 1995 (name verified source)
Ancistrospora G. Thor, 1991 accepted as Ancistrosporella G. Thor, 1995 (basis of record)
Ancylistes Pfitzer, 1872 (basis of record)
Androsaceus (Persoon) Patouillard, 1887 accepted as Marasmius E.M. Fries, 1836 (basis of record)
Angatia H. Sydow in H. Sydow & P. Sydow, 1914 (basis of record)
Anisolpidium Karling, 1943 (basis of record)
Aphanodictyon Huneycutt ex M.W. Dick, 1971 (basis of record)
Aphanomyces de Bary, 1860 (basis of record)
Aphanomycopsis A. Scherffel, 1925 (basis of record)
Aplanes de Bary, 1888 (basis of record)
Aplanochytrium G. Bahnweg & F.K. Sparrow, 1972 (basis of record)
Aplanopsis Höhnk, 1952 (basis of record)
Aplectosoma Drechsler, 1951 (basis of record)
Apodachlya Pringsheim, 1883 (basis of record)
Apodachlyella Indoh, 1939 (basis of record)
Apodya Cornu, 1872 accepted as Leptomitus C.A. Agardh, 1824 (basis of record)
Apophysomyces P.C. Misra in P.C. Misra et al., 1979 (basis of record)
Aqualinderella R. Emerson & W.H. Weston, 1967 (basis of record)
Aquamortierella R.W. Embree & H. Indoh, 1967 (basis of record)
Araiospora Thaxter, 1896 (basis of record)
Araneosa W.H. Long, 1941 (basis of record)
Archilegnia Apinis, 1935 (basis of record)
Arthonaria E.M. Fries, 1825 accepted as Enterographa Fée, 1824 (basis of record)
Arthoniactis (Vainio) Clements, 1909 (basis of record)
Arthoniomyces E.A. Thomas ex Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (basis of record)
Arthoniopsis J. Müller Arg., 1890 accepted as Arthonia E. Acharius, 1806 (basis of record)
Arthrobotrys Corda, 1839 (basis of record)
Arthroderma Currey, 1860 (basis of record)
Arthrosporella Singer, 1970 (basis of record)
Artotrogus Montagne in Berkeley, 1845 accepted as Pythium N. Pringsheim, 1858 (basis of record)
Arundinella L. Léger & Duboscq, 1905 accepted as Arundinula L. Léger & Duboscq, 1906 (basis of record)
Arundinula L. Léger & Duboscq, 1906 (basis of record)
Ascocalyx Naumov, 1926 (basis of record)
Ascocoryne J.W. Groves & D.E. Wilson, 1967 (basis of record)
Ascoidea Brefeld, 1891 (basis of record)
Ascomauritiana V.M. Ranghoo & K.D. Hyde, 1999 (basis of record)
Ascotremella F. Seaver, 1930 (basis of record)
Asellaria R.A. Poisson, 1932 (basis of record)
Ashbya Guilliermond, 1928 (basis of record)
Aspergillus E.M. Fries, 1832 accepted as Aspergillus P. Micheli ex Haller, 1768 (extant flag source)
Aspergillus E.M. Fries, 1832 accepted as Aspergillus P. Micheli ex Haller, 1768 (basis of record)
Asproinocybe R. Heim, 1970 (basis of record)
Asterocystis De Wildeman, 1893 accepted as Olpidium (A. Braun) J. Schröter in Cohn, 1886 (basis of record)
Asterotrema J. Müller Arg., 1884 accepted as Arthonia E. Acharius, 1806 (basis of record)
Astreptonema Hauptfleisch, 1895 (basis of record)
Atkinsiella Vishniac, 1958 (basis of record)
Aulaxinomyces Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (basis of record)
Auricularia Bulliard ex Jussieu, 1789 (basis of record)
Auriculariopsis R. Maire, 1902 (basis of record)
Austroomphaliaster N. Garrido, 1988 (basis of record)
Austrosmittium R.W. Lichtwardt & M.C. Williams in M.C. Williams & R.W. Lichtwardt, 1990 (basis of record)
Azygites E.M. Fries, 1832 accepted as Syzygites Ehrenberg, 1818 (basis of record)
Azygites E.M. Fries, 1832 accepted as Syzygites Ehrenberg, 1818 (name verified source)
Bacidiactis M. Choisy, 1931 accepted as Lecanactis Körber, 1855 (basis of record)
Backusella Hesseltine & J.J. Ellis in J.J. Ellis & Hesseltine, 1969 (basis of record)