| macroannulatum Ito & Imai (Hypoxylon) |
| macrocarpa Y.-M. Ju & J. D. Rogers (Nemania) |
| macrocarpum Pouzar (Hypoxylon) |
| macrocenangia (Ces.) Cooke (Nummularia) |
| macrocenangium Ces. (Hypoxylon) |
| macromphala (Mont.) P. Martin (Numulariola) |
| macromphalum Mont. (Hypoxylon) |
| macrosperma (Mont.) J. D. Rogers & Y.-M. Ju (Kretzschmaria) |
| macrospermum Mont. (Hypoxylon) |
| macrospora Pat. (Nummularia) |
| macrospora San Martín, Y.-M. Ju, & J. D. Rogers (Daldinia) |
| macrosporum P. Karst. (Hypoxylon) |
| macula (Schwein.) Van der Gucht (Biscogniauxia) |
| macula (Tode) S. F. Gray (Nemania) |
| macula Tode (Sphaeria) |
| maculata (Theiss.) J. D. Rogers, Y.-M. Ju, & San Martín (Whalleya) |
| maculata Theiss. (Nummularia) |
| maculatum (Theiss.) J. H. Miller (Hypoxylon) |
| maculosa (J. D. Rogers, Callan & Samuels) G. J. D. Smith & K. D. Hyde (Nemania) |
| maculosum J. D. Rogers, Callan, & Samuels (Hypoxylon) |
| maculum (Schwein.) J. H. Miller (Hypoxylon) |
| madangense Van der Gucht, Y.-M. Ju, & J. D. Rogers (Hypoxylon) |
| magellanicum Speg. (Hypoxylon) |
| magnosporum C. G. Lloyd (Hypoxylon) |
| magnum A. Möller (Hypoxylon) |
| majusculum Cooke (Hypoxylon) |
| malleola (Berk. & Ravenel) Kauffm. (Daldinia) |
| malleolus Berk. & Ravenel (Hypoxylon) |
| mammaeforme (Pers.: Fr.) Berk. (Hypoxylon) |
| mammaeformis Hoffm. (Sphaeria) |
| mammaeformis Wahlenberg (Sphaeria) |
| mammata (Wahlenberg) J. D. Rogers & Y.-M. Ju (Entoleuca) |
| mammatum (Wahlenberg) P. Karst. (Hypoxylon) |
| marginata (Fr.: Fr.) Pouzar (Biscogniauxia) |
| marginatum (Schwein.) Berk. (Hypoxylon) |
| marginatum (Schwein.) Berk. var. emarginata Theiss. (Hypoxylon) |
| marginatum (Schwein.) Berk. var. mammiforme Rehm (Hypoxylon) |
| maritima Lar. N. Vasilyeva (Biscogniauxia) |
| maritima Y.-M. Ju & J. D. Rogers (Nemania) |
| mascariensis Berk. ex Cooke (Hypoxylon) |
| massarae De Not. (Hypoxylon) |
| mauritanica (Durieu & Mont.) Pat. (Kretzschmaria) |
| mauritanica Berk. & Cooke (Nummularia) |
| mauritanicum (Durieu & Mont.) Mont. (Hypoxylon) |
| maxima (Massee) Theiss. & Syd. (Nummularia) |
| maxima (Weber) House (Nemania) |
| maxima (Weber) Wettst. (Ustulina) |
| maxima Weber (Sphaeria) |
| maxima, convexa, nigerrima Haller (Sphaeria) |
| mbaiense Speg. (Hypoxylon) |
| mediterranea (De Not.) Kuntze (Biscogniauxia) |
| mediterranea (De Not.) Kuntze var. macrospora (J. H. Miller) Y.-M. Ju & J. D. Rogers (Biscogniauxia) |
| mediterranea (De Not.) Kuntze var. microspora (J. H. Miller) Y.-M. Ju & J. D. Rogers (Biscogniauxia) |
| mediterraneum (De Not.) J. H. Miller (Hypoxylon) |
| mediterraneum (De Not.) J. H. Miller var. macrospora J. H. Miller (Hypoxylon) |
| mediterraneum (De Not.) J. H. Miller var. microspora J. H. Miller (Hypoxylon) |
| medullare (Wallr.) P. Martin (Hypoxylon) |
| megalocarpum (Plowr.) P. Martin (Hypoxylon) |
| megalospermum (Syd. & P. Syd.) P. Martin (Hypoxylon) |
| megalospora J. D. Rogers & Y.-M. Ju (Kretzschmaria) |
| megalosporum Speg. (Hypoxylon) |
| megannulatum Taligoola & Whalley (Hypoxylon) |
| melaleuca Ellis & Everh. (Rosellinia) |
| melanaspis (Mont.) Cooke (Nummularia) |
| melanaspis (Mont.) Mont. (Hypoxylon) |
| mellisii Berk. (Hypoxylon) |
| melogrammum (Bull.: Fr.) J. Kickx fil. (Hypoxylon) |
| memorabilis (Rehm) Y.-M. Ju & J. D. Rogers (Nemania) |
| memorabilis Rehm (Nummularia) |
| merrillii Bres. (Nummularia) |
| merrillii Syd. & P. Syd. (Hypoxylon) |
| metachroa Ferd. & Winge (Rosellinia) |
| mexicana J. D. Rogers, & Y.-M. Ju, & San Martín (Jumillera) |
| mexicana San Martín, Y.-M. Ju, & J. D. Rogers (Daldinia) |
| michelianum Ces. & De Not. (Hypoxylon) |
| microcarpum Penz. & Sacc. (Hypoxylon) |
| microcephala (Mont.) Sacc. (Kretzschmaria) |
| microceras Mont. (Hypoxylon) |
| microplaca (Berk. & M. A. Curtis) Cooke (Nummularia) |
| microplaca (Berk. & M. A. Curtis) J. D. Rogers, Y.-M. Ju, & San Martín (Whalleya) |
| microplacum (Berk. & M. A. Curtis) J. H. Miller (Hypoxylon) |
| micropus (Fr.: Fr.) Berk. (Hypoxylon) |
| micropus (Fr.: Fr.) Sacc. (Kretzschmaria) |
| microsorum Penz. & Sacc. (Hypoxylon) |
| microsperma Traverso ex Sacc. (Ustulina) |
| microspora (P. Karst.) P. Martin (Numulariola) |
| microspora Henn. (Kretzschmaria) |
| microspora Pande (Hypoxylon) |
| microspora Speg. non Traverso (Ustulina) |
| microspora Traverso non Speg. (Ustulina) |
| microsporum Ces. (Hypoxylon) |
| microsticta (Mont.) Cooke (Nummularia) |
| microstictum (Mont.) Mont. (Hypoxylon) |
| microstroma Penz. & Sacc. (Hypoxylon) |
| miliaceum Bull. (Hypoxylon) |
| milleri De Hoog (Hypoxylon) |
| milleri J. D. Rogers & Y.-M. Ju (Kretzschmaria) |
| miniatum Cooke (Hypoxylon) |
| minutellum Syd. & P. Syd. (Hypoxylon) |
| minutissimum P. Martin (Hypoxylon) |
| minutula (Penz. & Sacc.) Y.-M. Ju & J. D. Rogers (Nemania) |
| minutula Penz. & Sacc. (Nummularia) |
| minutulum (Penz. & Sacc.) J. M. Miller ex S. Teng (Hypoxylon) |
| minutum Nitschke (Hypoxylon) |
| moelleranum (Henn.) Y.-M. Ju & J. D. Rogers (Hypoxylon) |
| moelleri Henn. (Stilbohypoxylon) |
| moelleriana Henn. (Nummularia) |
| monticulosum Mont. (Hypoxylon) |
| moravicum Pouzar (Hypoxylon) |
| morganii Ellis & Everh. (Hypoxylon) |
| morganii P. Martin (Numulariola) |
| mori Hara (Ustulina) |
| moriforme Henn. (Hypoxylon) |
| moriforme Henn. var. microdiscus Y.-M. Ju & J. D. Rogers (Hypoxylon) |
| morsei Berk. & M. A. Curtis (Hypoxylon) |
| moselei (Berk.) Cooke (Nummularia) |
| moselei Berk. (Hypoxylon) |
| mucigera Van der Gucht (Biscogniauxia) |
| mucronata (Mont.) P. Martin (Numulariola) |
| mulleri J. H. Miller (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. f. minor Starb. (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. var. alaskense Y.-M. Ju & J. D. Rogers (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. var. australe Cooke (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. var. effusum (Fr.: Fr.) Cooke & Ellis (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. var. granulosum Sacc. (Hypoxylon) |
| multiforme (Fr.: Fr.) Fr. var. luxurians (Rehm) Sacc. (Hypoxylon) |
| multiformis Fr.: Fr. var. alnea Fr. (Sphaeria) |
| multiformis Fr.: Fr. var. coarctata Fr. (Sphaeria) |
| multiformis Fr.: Fr. var. dilatata Fr. (Sphaeria) |
| multiformis Fr.: Fr. var. granulosa (Pers.: Fr.) Fr. (Sphaeria) |
| multiplex (Kunze: Fr.) Mont. (Hypoxylon) |
| munkii Whalley, Hammelev, & Taligoola (Hypoxylon) |
| murcidum Berk. & Broome (Hypoxylon) |
| murraii Berk. & M. A. Curtis (Hypoxylon) |
| murrillii C. G. Lloyd (Daldinia) |
| musceum J. D. Rogers (Hypoxylon) |
| mutans (Cooke & Peck) P. Martin (Hypoxylon) |
| myriangioides Berk. & Ravenel (Hypoxylon) |
| myrmecophila J.C. Lindq. & J.E. Wright (Discoxylaria) |
