Species (13.556)
- Ombrophila pileata (P. Karst.) P. Karst. 1870
- Ombrophila rehnana Baral & T. Richter
- Ombrophila rudis (Berk.) W. Phillips 1887
- Ombrophila subcerinea Rehm 1906
- Ombrophila tschatcalica Raitv. 1969
- Ombrophila tetracladia (Abdullah, Descals & J. Webster) Baral 1985
- Ombrophila violacea (Hedw.) Fr. 1849
- Opegrapha pulvinata Rehm 1869
- Opegrapha thelotrematis Coppins 1987
- Opegrapha physciaria (Nyl.) D. Hawksw. & Coppins 1992
- Opegrapha rupestris Pers. 1794
- Ophiobolus cesatianus (Mont.) Sacc. 1883
- Ophiobolus acuminatus (Sowerby : Fr.) Duby 1855
- Ophiobolus clavisporus Pass. 1890
- Ophiobolus collapsus Ellis & Sacc. 1881
- Ophiobolus crassus Shoemaker 1976
- Ophiobolus erythrosporus (Riess) G. Winter 1886
- Ophiobolus fruticum (Roberge ex Desm.) Sacc. 1883
- Ophiobolus ophioboloides (Sacc.) L. Holm 1948
- Ophiobolus niesslii Bäumler 1887
- Ophiobolus galii Richon 1889
- Ophiobolus persolinus (Caldesi & De Not.) Sacc. 1883
- Ombrophila alba (Schumach.) Boud. 1907
- Ombrophila aquosa Velen. 1934
- Ombrophila limosella (P. Karst.) Rehm 1881
- Ombrophila pura (Pers. : Fr.) Baral 1985
- Ombrophila rivulorum Velen. 1934
- Omphalospora melaena (Fr.) Höhn. 1919
- Oomyces incanus Rehm 1905
- Ophioceras leptosporum (S.H. Iqbal) J. Walker 1980
- Ophiocordyceps ditmarii (Quél.) G.H. Sung, J.M. Sung, Hywel-Jones & Spataf
- Ophiocordyceps entomorrhiza (Dicks.) G.H. Sung, J.M. Sung, Hywel-Jones & Spata
- Ophiocordyceps forquignonii (Quél.) G.H. Sung, J.M. Sung, Hywel-Jones & Spataf
- Ophiocordyceps larvicola (Quél.) Van Vooren 2009
- Nodulosphaeria septemcellulata (E. Müll.) L. Holm 1957
- Nodulosphaeria volkartii (E. Müll.) L. Holm & E. Müll. 1961
- Nummularia gigas W. Phillips & Plowr. 1880
- Obryzum corniculatum Wallr. 1825
- Ocellaria ocellata (Pers. : Fr.) J. Schröt. 1893
- Ochronectria calami (Henn. & E. Nyman) Rossman & Samuels 1999
- Octospora lilacina (Seaver) Svr?ek & Kubi?ka 1963
- Octospora nemoralis Benkert & Brouwer 2004
- Octospora phagospora (Flageolet & Lorton) Dennis & Itzerott 1973
- Octospora rubens (Boud.) M.M. Moser 1963
- Octospora pseudoampezzana (Svr?ek) Caillet & Moyne 1987
- Octospora splachnophila Benkert & Kristiansen 2008
- Octospora svrcekii Benkert 1998
- Octospora subglobispora Benkert 1997
- Octospora wrightii (Berk. & M.A. Curtis) J. Moravec 1969
- Octosporella erythrostigma (Mont.) Döbbeler 2004
- Nimbomollisia trichophoricola (Graddon) Nannf. 1983
- Niptera myriadea (Cooke & Massee) Boud. 1907
- Niptera melanophaea Rehm 1891
- Niptera ramincola Rehm 1896
- Niptera umbelliferarum Velen. 1934
- Niptera subbiatorina Rehm 1891
- Niptera rollandii Boud. 1888
- Nitschkia brevispina (Munk) Nannf. 1975
- Nitschkia cupularis (Pers. : Fr.) P. Karst. 1873
- Nitschkia confertula (Schwein.) Nannf. 1975
- Nitschkia grevillei (Rehm) Nannf. 1975
- Nodulisporium geochroum (Desm.) Stalpers 1984
- Nitschkia parasitans (Schwein.) Nannf. 1975
- Nodulisporium cecidiogenes Jørg. Koch 1994
- Nodulosphaeria aquilana (Sacc.) L. Holm 1957
- Nodulosphaeria muelleri L. Holm 1961
- Nodulosphaeria engadinensis (E. Müll.) Shoemaker & C.E. Babc. 1987
- Nodulosphaeria modesta (Desm.) L. Holm 1957
- Nodulosphaeria franconica (Petr.) L. Holm 1957
- Nodulosphaeria pileata (Volkart) Crivelli 1983
- Nodulosphaeria pontica (Petr.) L. Holm 1957
- Nodulosphaeria pseudaffinis (Petr.) L. Holm 1961
- Nodulosphaeria rupestris (E. Müll.) Crivelli 1983
- Nodulosphaeria spectabilis (Niessl) L. Holm 1961
- Octospora coccinea var. tetraspora Benkert 1998
- Octospora convexula (Pers.) L.R. Batra 1963
- Octospora echinospora Caillet & Moyne 1987
- Octospora excipulata (Clem.) Benkert 2008
- Octospora erzbergeri Benkert 2006
- Octospora fissidentis Benkert & Brouwer 2004
- Octospora gemmicola Benkert 1998
- Octospora coccinea (P. Crouan & H. Crouan) Brumm. 1967
- Octospora guestfaliensis Benkert 2009
- Taphrina pseudoplatani (C. Massal.) Jaap 1917
- Taphrina sadebeckii Johanson 1885
- Taphrina rhizophora Johanson 1886
- Taphrina tosquinetii (Westend.) Magnus 1866
- Taphrina ulmi (Fuckel) Johanson 1886
- Taphrina viridis (Sadeb.) Maire 1910
- Taphrina wiesneri (Ráthay) Mix 1954
- Tarbertia juncina Dennis 1974
- Tarzetta catinus (Holmsk.) Korf & J.K. Rogers 1971
- Tarzetta spurcata (Pers.) Harmaja 1974
- Tarzetta pusilla Harmaja 1974
- Tarzetta insignis (Berthet & Riousset) Korf & J.K. Rogers 1971
- Tarzetta scotica (Rea) Y.J. Yao & Spooner 2002
- Tarzetta velata (Quél.) Svr?ek 1981
- Thaxteriella corynespora (Munk) J.L. Crane, Shearer & M.E. Barr 1998