Aaosphaeria A. Aptroot, 1995 (basis of record)
Acantharia Theissen & H. Sydow, 1918 (basis of record)
Acanthophiobolus Berlese, 1893 (basis of record)
Acanthostigma De Notaris, 1863 (basis of record)
Acanthostigmella F. von Höhnel, 1905 (basis of record)
Achaetobotrys A.C. Batista & R. Ciferri, 1963 (basis of record)
Achorella Theissen & H. Sydow, 1915 (basis of record)
Achorodothis H. Sydow, 1926 (basis of record)
Acrocordia A. Massalongo, 1854 (basis of record)
Acrocordiella O.E. Eriksson, 1982 (basis of record)
Acrocordiopsis B.D. Borse & K.D. Hyde, 1989 (basis of record)
Acrogenotheca R. Ciferri & A.C. Batista, 1963 (basis of record)
Acrospermum Tode, 1790 (basis of record)
Actidiographium Lar.N. Vassiljeva, 2000 (basis of record)
Actidium E.M. Fries, 1815 (basis of record)
Actinocymbe F. von Höhnel, 1911 (basis of record)
Actinomyxa H. Sydow & P. Sydow, 1917 (basis of record)
Actinopeltis F. von Höhnel, 1907 (basis of record)
Adelococcus Theissen & H. Sydow, 1918 (basis of record)
Aigialus J. Kohlmeyer & S. Schatz, 1986 (basis of record)
Aithaloderma P. Sydow in H. Sydow & P. Sydow, 1913 (basis of record)
Aldona Raciborski, 1900 (basis of record)
Aldonata A. Sivanesan & A.R.P. Sinha, 1989 (basis of record)
Alina Raciborski, 1909 (basis of record)
Aliquandostipite P. Inderbitzin in P. Inderbitzin et al., 2001 (basis of record)
Allonecte H. Sydow, 1939 (basis of record)
Allosoma H. Sydow, 1926 (basis of record)
Allothyrium H. Sydow, 1939 (basis of record)
Amarenomyces O.E. Eriksson, 1981 (basis of record)
Amazonomyces A. Batista in A. Batista & G.E.P. Peres, 1964 (basis of record)
Amazonotheca Batista & H. Maia, 1959 (basis of record)
Amphinectria Spegazzini, 1924 (basis of record)
Amylirosa Spegazzini, 1920 (basis of record)
Anariste H. Sydow, 1927 (basis of record)
Ancistrosporella G. Thor, 1995 (basis of record)
Anhellia Raciborski, 1900 (basis of record)
Anisomeridium (J. Müller Arg.) M. Choisy, 1928 (basis of record)
Anomalemma A. Sivanesan, 1983 (basis of record)
Anopeltis Batista & Peres, 1960 (basis of record)
Antennularia H.G.L. Reichenbach, 1829 (basis of record)
Antennulariella Woronichin, 1915 (basis of record)
Anthracostroma Petrak, 1954 (basis of record)
Anthracothecium Hampe ex A. Massalongo, 1860 (basis of record)
Aphanopeltis H. Sydow, 1927 (basis of record)
Aphanostigme H. Sydow, 1926 (basis of record)
Apiosporina F. von Höhnel, 1910 (basis of record)
Appendispora K.D. Hyde, 1994 (basis of record)
Architrypethelium A. Aptroot, 1991 (basis of record)
Argynna A.P. Morgan, 1895 (basis of record)
Arkoola J. Walker & G.E. Stovold, 1986 (basis of record)
Armata W. Yamamoto, 1958 (basis of record)
Arnaudiella Petrak, 1927 (basis of record)
Arthonia E. Acharius, 1806 (basis of record)
Arthophacopsis Hafellner, 1998 (basis of record)
Arthopyrenia A. Massalongo, 1852 (basis of record)
Arthothelium A. Massalongo, 1852 (basis of record)
Ascocratera Kohlmeyer, 1986 (basis of record)
Ascominuta V.M. Ranghoo & K.D. Hyde, 2000 (basis of record)
Ascostratum H. Sydow & P. Sydow, 1912 (basis of record)
Asterina Léveillé, 1845 (basis of record)
Asterinella Theissen, 1912 (basis of record)
Asterinema Batista & Gayão, 1953 (basis of record)
Asteritea A.C. Batista & R. Garnier in A.C. Batista, R. Garnier & H. Maia, 1961 (basis of record)
Asterodothis Theissen, 1912 (basis of record)
Asterolibertia G. Arnaud, 1918 (basis of record)
Asteromassaria F. von Höhnel, 1917 (basis of record)
Asteronia (P.A. Saccardo) P.C. Hennings, 1895 (basis of record)
Asteroporum J. Müller Arg., 1884 (basis of record)
Asterotexis J.A. von Arx, 1958 (basis of record)
Astrosphaeriella H. Sydow & P. Sydow, 1913 (basis of record)
Astrothelium Eschweiler, 1824 (basis of record)
Asymmetricospora J. Fröhlich & K.D. Hyde, 1998 (basis of record)
Athrismidium Trevisan, 1860 accepted as Tomasellia A. Massalongo, 1856 (basis of record)
Atopospora Petrak, 1925 (basis of record)
Auerswaldia P.A. Saccardo, 1883 (basis of record)
Auerswaldiella Theissen & H. Sydow, 1914 (basis of record)
Aulacostroma H. Sydow & P. Sydow, 1914 (basis of record)
Aulographina J.A. von Arx & E. Müller, 1960 (basis of record)
Aulographum Libert, 1834 (basis of record)
Bactrospora A. Massalongo, 1852 (basis of record)
Baggea Auerswald, 1866 (basis of record)
Bagnisiella Spegazzini, 1880 accepted as Aplosporella Spegazzini, 1880 (basis of record)
Balladyna Raciborski, 1900 (basis of record)
Balladynocallia Batista in Batista, Silva & Bezerra, 1965 (basis of record)
Balladynopsis Theissen & H. Sydow, 1918 (basis of record)
Banhegyia L. Zeller & Tóth, 1960 (basis of record)
Barria Z.Q. Yuan, 1994 (basis of record)
Batistinula J.A. von Arx, 1960 (basis of record)
Beelia F. Stevens & R.W. Ryan, 1925 (basis of record)
Belizeana J. Kohlmeyer & B. Volkmann-Kohlmeyer, 1987 (basis of record)
Bertiella (P.A. Saccardo) P.A. Saccardo & P. Sydow, 1899 accepted as Massarina P.A. Saccardo, 1883 (basis of record)
Biatriospora K.D. Hyde & B.D. Borse, 1986 (basis of record)
Biciliopsis P. Diederich in A. Aptroot et al., 1997 (basis of record)
Bicrouania J. Kohlmeyer & B. Volkmann-Kohlmeyer, 1990 (basis of record)
Bifrontia Norman, 1872 (basis of record)
Bimuria D.L. Hawksworth, C.Y. Chea & J.E. Sheridan, 1979 (basis of record)
Blasdalea P.A. Saccardo & P. Sydow, 1902 (basis of record)
Blastodesmia A. Massalongo, 1852 (basis of record)
Boerlagiomyces F. Butzin, 1977 (basis of record)
Bonaria Batista, 1959 (basis of record)