| Macentina abscondita Coppins & Vezda = Psoroglaena abscondita |
| Macentina aurantiaca P.M. McCarthy & Vezda = Nectria pseudopeziza (Desm.) Rossman |
| Macentina stigonemoides Orange = Psoroglaena stigonemoides |
| Macrophomina pseudeverniae Etayo & Diederich = Diederichia pseudeverniae |
| Massalongia carnosa var. determinata (Nyl.) A.L. Sm. = Massalongia carnosa |
| Massalongia cheilea Mudd = Fuscopannaria leucophaea |
| Megalospora pachycarpa (Delise ex Duby) H. Olivier = Megalospora tuberculosa |
| Melanaria lactescens (Mudd) Erichsen = Pertusaria lactescens |
| Melanaria urceolaria (Nyl.) Erichsen = Pertusaria lactescens |
| Melanelia acetabulum (Neck.) Essl. = Pleurosticta acetabulum |
| Melanelia glabratula (Lamy) Essl. = Melanelia fuliginosa subsp. glabratula |
| Melanelixia fuliginosa (Fr. ex Duby) O. Blanco et al. = Melanelia fuliginosa |
| Melanelixia fuliginosa subsp. glabratula (Lamy) J.R. Laundon = Melanelia fuliginosa
subsp. glabratula |
| Melanelixia subargentifera (Nyl.) O. Blanco et al. = Melanelia subargentifera |
| Melanelixia subaurifera (Nyl.) O. Blanco et al. = Melanelia subaurifera |
| Melanohalea elegantula (Zahlbr.) O. Blanco et al. = Melanelia elegantula |
| Melanohalea exasperata (De Not.) O. Blanco et al. = Melanelia exasperata |
| Melanohalea exasperatula (Nyl.) O. Blanco et al. = Melanelia exasperatula |
| Melanohalea laciniatula (Flagey ex H. Olivier) O. Blanco et al. = Melanelia
laciniatula |
| Melanohalea septentrionalis (Lynge) O. Blanco et al. = Melanelia septentrionalis |
| Melanolecia jurana (Schaer.) Hertel = Farnoldia jurana |
| Melanospora cerebrina (DC.) Mudd = Poeltinula cerebrina |
| Melanotheca diffusa Leight. = Tomasellia diffusa |
| Melanotheca gelatinosa (Chevall.) Zahlbr. = Tomasellia gelatinosa |
| Melanotheca ischnobela Nyl. = Celothelium ischnobelum |
| Melaspilea constrictella Stirt. = type è only collection considered not to have
originated from the British Isles |
| Melaspilea patersonii Stirt. = Bactrospora dryina |
| Melaspilea subarenacea J. Nowak & Kiszka = Melaspilea granitophila |
| Melaspilea vermifera Leight. = Spirographa fusisporella |
| Melittiosporium lichenicola (Mont.) Massee = Diploschistes muscorum |
| Menegazzia pertusa (Schaer.) Stein = Menegazzia terebrata |
| Merismatium deminuta (Arnold) Cl. Roux & Nav.-Ros. = Polyblastia deminuta |
| Merismatium lopadii = Merismatium discrepans |
| Metasphaeria cetrariicola (Nyl.) Sacc. = Lichenopeltella cetrariicola |
| Metasphaeria stereocaulorum (Arnold) Sacc. = Cercidospora stereocaulorum |
| Metasphaeria tartarina (Nyl.) Keissl. = Sagediopsis campsteriana |
| Micarea bacidiella sensu Vezda, non (Vain.) Vezda = Micarea globulosella |
| Micarea chrysophthalma P. James = Chrysothrix chrysophthalma |
| Micarea clavulifera (Nyl.) Coppins & P James = Psilolechia clavulifera |
| Micarea confusula (Nyl.) Hedl. = Micarea subnigrata |
| Micarea excipulata Coppins = Micarea lynceola |
| Micarea gomphillacea (Nyl.) Vezda = Micarea lignaria var. lignaria |
| Micarea granulans (Vain.) Timdal = Micarea submilliaria |
| Micarea intrusa (Th. Fr.) Coppins & H. Kilias = Carbonea intrusa |
| Micarea klementii Coppins ad int. = Micarea alabastrites |
| Micarea leprosa P. James = Vezdaea leprosa |
| Micarea lignaria f. gomphillacea (Nyl.) Hedl. = Micarea lignaria var. lignaria |
| Micarea longispora Coppins ad int. = Micarea synotheoides |
| Micarea melaenida (Nyl.) Coppins = Micarea poliodes (Nyl.) Vezda = Micarea lutulata |
| Micarea prasina f. micrococca Hedl. = Micarea micrococca |
| Micarea subleprosula (Vezda) Vezda = Micarea submilliaria |
| Micarea submoestula (Nyl.) Coppins = Micarea subconfusa |
| Micarea subviolascens (H. Magn.) Coppins = Micarea paratropa |
| Micarea verrucula (Norman) Hedl. = Micarea turfosa |
| Micarea violacea (Crouan ex Nyl.) Hedl. = Micarea peliocarpa |
| Microcalicium subpedicillatum (Schaer.) Tibell = Microcalicium disseminatum {F or LF} |
| Microdiplodia ferrugineae Vouaux = Lichenodiplis lecanorae |
| Microdiplodia lecanorae Vouaux = Lichenodiplis lecanorae |
| Microglaena breadalbanensis Wheldon & A. Wilson = Protothelenella corrosa |
| Microglaena corrosa Arnold = Protothelenella corrosa |
| Microglaena holliana A.L. Sm. = Thelenella muscorum var. octospora |
| Microglaena isidioides (Borrer) A.L. Sm. = Thelotrema isidioides |
| Microglaena larbalestieri A.L. Sm. = Thelenella larbalestieri |
| Microglaena leucothelia (Anzi) Arnold = Protothelenella leucothelia |
| Microglaena leucothelia (Nyl.) Arnold = Protothelenella leucothelia |
| Microglaena modesta (Nyl.) A.L. Sm. = Thelenella modesta |
| Microglaena muscorum (Fr.) Th. Fr. = Thelenella muscorum |
| Microglaena muscorum var. octospora (Nyl.) Cretz. = Thelenella muscorum var. octospora |
| Microglaena nuda Wheldon & Travis = Verrucaria sp. |
| Microglaena sericea (A. Massal.) Lönnr. = Julella sericea |
| Microglaena sphinctrinoidella (Nyl.) Arnold = Protothelenella sphinctrinoidella |
| Microglaena sphinctrinoides (Nyl.) Lönnr. = Protothelenella sphinctrinoides |
| Micropeltopsis cetrariicola (Nyl.) Vain. = Lichenopeltella cetrariicola |
| Microphiale diluta (Pers.) Zahlbr. = Dimerella pineti |
| Microphiale lutea (Dicks.) Zahlbr. = Dimerella lutea |
| Microthelia alcicornaria Linds. = Lichenosticta alcicornaria |
| Microthelia baeomycearia Linds. = Pyrenidium actinellum |
| Microthelia calcaricola Mudd = Muellerella lichenicola |
| Microthelia dispora A.L. Sm. = Polycoccum dzieduszyckii |
| Microthelia dispora f. octospora Walt. Watson = Polycoccum marmoratum |
| Microthelia dissepta (Nyl.) A.L. Sm. = Weddelomyces periphericus |
| Microthelia exerrans (Nyl.) A.L. Sm. = Endococcus exerrans |
| Microthelia leightonii Zahlbr. = Rinodina bischoffiiv |
| Microthelia marmorata (Kremp.) Hepp = Polycoccum marmoratum |
| Microthelia micula = Mycomicrothelia confusa |
| Microthelia solorinaria Linds. = Rhagadostoma lichenicola |
| Microthelia ventosicola Mudd = Muellerella ventosicola |
| Miriquidica liljenstroemii (Du Rietz) R. Sant. = Miriquidica nigroleprosa var.
liljenstroemii |
| Miriquidica pycnocarpa andreev = Lecidea pycnocarpa |
| Moelleropsis humida (Kullh.) Coppins = Gregorella humida |
| Monodictys lepraria (Berk.) M.B. Ellis = Monodictys cellulosa |
| Mosigia illita (Nyl.) R. Sant. = Rimularia badioatra |
| Mosigia intercedens (H. Magn.) R. Sant. = Rimularia intercedens |
| Mucor furfuraceus L. = Chaenotheca furfuracea |
| Muellerella atricola (Linds.) Sacc. & D. Sacc. = Muellerella lichenicola |
| Muellerella haplotella (Nyl.) Arnold = Muellerella polyspora |
| Muellerella opegraphicola Zopf = Muellerella polyspora |
| Muellerella pygmaea var. ventosicola (Mudd) Triebel = Muellerella ventosicola |
| Mycobacidia arenicola (Nyl.) Sacc. & D. Sacc. = Arthrorhaphis grisea |
| Mycobacidia flavovirescens (Dicks.) Rehm = Arthrorhaphis citrinella |
| Mycobilimbia accedens (Arnold) V. Wirth ex Hafellner = Bilimbia sabuletorum |
| Mycobilimbia ahlesii R. Sant., com. inval. = Lecidea ahlesii |
| Mycobilimbia berengeriana (A. Massal.) Hafellner & V. Wirth = Lecidea berengeriana |
| Mycobilimbia carneoalbida (Müll. Arg.) S. Ekman & Printzen = Biatora carneoalbida |
| Mycobilimbia endocarpicola (Linds.) Vouaux = Toninia verrucarioides |
| Mycobilimbia epixanthoides (Nyl.) Vitik., Ahti, Kuusinen, Lommi & T. Ulvinen in
Hafellner = Biatora epixanthoides |
| Mycobilimbia fusca (A. Massal.) Hafellner & V. Wirth = Biatora tetramera |
| Mycobilimbia hypnorum (Lib.) Kalb & Hafellner = Lecidea hypnorum |
| Mycobilimbia killiasii (Hepp) Rehm = Bacidia killiasii |
| Mycobilimbia lobulata (Sommerf.) Hafellner = Bilimbia lobulata |
| Mycobilimbia lurida (Ach.) Hafellner & Türk = Psora lurida |
| Mycobilimbia pilularis Hafellner & Türk = Biatora sphaeroides |
| Mycobilimbia sabuletorum (Schreb.) Hafellner = Bilimbia sabuletorum |
| Mycobilimbia sphaeroides D.D. Awasthi = Biatora carneoalbida |
| Mycobilimbia tetramera (De Not.) Vitik., Ahti, Kuusinen, Lommi & T. Ulvinen in
Hafellner = Biatora tetramera |
| Mycoblastus sterilis Coppins & P. James = Mycoblastus fucatus |
| Mycoblastus tornoensis (Nyl.) R.A. anderson = Japewia tornoensis |
| Mycocalicium parietinum (Ach.) Vain. = Mycocalicium subtile |
| Mycomelaspilea leciographoides (Vouaux) Keissl. = Melaspilea leciographoides |
| Mycoporellum sparsellum (Nyl.) Müll. Arg. = Mycoporum lacteum |
| Mycoporum hippocastani (DC.) Coppins = Cyrtidula hippocastani |
| Mycoporum misserrimum Nyl. = Cyrtidula quercus |
| Mycoporum ptelaeodes (Ach.) Nyl. = Cyrtidula hippocastani |
| Mycoporum quercus (A. Massal.) Müll. Arg. = Cyrtidula quercus |
| Mycoporum quercus var. ilicis (Riedl) Coppins = name of uncertain application (type
lost) |
| Mycopyrenula coryli (A. Massal.) Vain. = Pyrenula coryli |
| Myxobilimbia accedens (Arnold) Hafellner = Bilimbia sabuletorum |
| Myxobilimbia lobulata (Sommerf.) Hafellner = Bilimbia lobulata |
| Myxobilimbia sabuletorum (Schreb.) Hafellner = Bilimbia sabuletorum |
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