Lichen Taxa held in MSC
| Genus | Species | N | MI | WI | S | Aus | E | Af | As | Notes | ||
| Maroana | constans | N | . | . | . | . | . | . | . | |||
| Maroana | multifera | . | . | WI | . | . | . | . | . | |||
| Masonhalea | richardsonii | N | . | . | . | . | . | . | . | |||
| Massalongia | carnosa | N | . | . | S | Aus | E | . | . | |||
| Massariella | bufonia | . | . | . | . | . | E | . | . | filed with Acrocordia gemmata | ||
| Mastodia | antarctica | . | . | . | S | Aus | . | . | . | |||
| Mazosia | dispersa | . | . | WI | . | . | . | . | . | |||
| Mazosia | ocellata | N | . | . | . | . | . | . | . | . | ||
| Mazosia | paupercula | . | . | WI | . | . | . | . | . | |||
| Mazosia | phyllosema | . | . | WI | . | . | . | Af | . | |||
| Mazosia | rotula | . | . | WI | . | . | . | . | . | |||
| Medusulina | nitida | N | . | . | . | . | . | . | . | |||
| Megalaria | grossa | . | . | . | S | Aus | E | . | . | |||
| Megalaria | laureri | N | MI | . | . | . | . | . | . | |||
| Megaloblastenia | marginiflexa | . | . | . | . | . | Aus | . | . | |||
| Megalospora | campylospora | . | . | . | . | Aus | . | . | . | |||
| Megalospora | coccodes | . | . | WI | . | . | . | . | As | |||
| Megalospora | cf. coccodes | . | . | . | S | . | . | . | . | |||
| Megalospora | cumminghamsiae | . | . | WI | . | . | . | . | . | |||
| Megalospora | gompholoma | . | . | . | . | Aus | . | . | . | |||
| Megalospora | jamaicensis | . | . | WI | . | . | . | . | . | |||
| Megalospora | lopadioides | . | . | . | . | Aus | . | . | . | |||
| Megalospora | occidentalis | . | . | . | . | Aus | . | . | . | |||
| Megalospora | pachycheilia | N | . | . | . | . | . | . | . | |||
| Megalospora | porphyrites | N | . | . | . | . | . | . | . | |||
| Megalospora | subtuberculosa | . | . | . | . | Aus | . | . | . | |||
| Megalospora | sulphurata | . | . | WI | . | Aus | . | . | As | |||
| Megalospora | tuberculosa | N | . | WI | S | . | E | . | . | |||
| Megaspora | verrucosa | N | MI | . | . | . | E | . | . | |||
| Melanelia | albertana | N | . | . | . | . | . | . | . | |||
| Melanelia | commixta | N | . | . | . | . | E | . | . | |||
| Melanelia | culbersonii | N | . | . | . | . | . | . | . | |||
| Melanelia | disjuncta | N | MI | . | . | . | E | . | . | |||
| Melanelia | elegantula | N | . | . | . | . | E | . | . | |||
| Melanelia | exasperata | . | MI | . | . | . | . | . | . | |||
| Melanelia | exasperatula | N | MI | . | . | . | E | . | . | |||
| Melanelia | fuliginosa | N | MI | . | . | . | E | . | . | |||
| Melanelia | glabra | N | . | . | . | . | E | . | . | |||
| Melanelia | glabroides | N | . | . | . | . | . | . | . | |||
| Melanelia | halei | N | . | . | . | . | . | . | . | |||
| Melanelia | hepatizon | N | MI | . | . | . | E | . | . | |||
| Melanelia | infumata | N | MI | . | . | . | E | . | . | |||
| Melanelia | multispora | N | . | . | . | . | . | . | . | |||
| Melanelia | olivacea | N | MI | . | . | . | E | . | . | |||
| Melanelia | panniformis | N | MI | . | . | . | E | . | . | |||
| Melanelia | septentrionalis | N | MI | . | . | . | E | . | . | |||
| Melanelia | sorediata | N | MI | . | . | . | E | . | . | |||
| Melanelia | stygia | N | . | . | . | . | E | . | . | |||
| Melanelia | subargentifera | N | MI | . | . | . | E | . | . | |||
| Melanelia | subaurifera | N | MI | . | S | . | E | . | . | |||
| Melanelia | subglabra | . | . | . | S | . | . | . | . | |||
| Melanelia | subolivacea | N | . | . | . | . | . | . | . | |||
| Melanelia | tominii | N | MI | . | . | . | E | . | . | |||
| Melanelia | trabeculata | N | MI | . | . | . | . | . | . | |||
| Melanelia | ushuaiensis | . | . | . | S | . | . | . | . | |||
| Melanotheca | diffusa | . | . | . | . | . | E | . | . | |||
| Melaspilea | arthonioides | . | . | . | S | . | . | . | . | |||
| Melaspilea | deformis | N | MI | . | . | . | . | . | . | |||
| Melaspilea | gibberulosa | . | . | . | . | . | E | . | . | |||
| Melaspilea | lentiginosula | . | . | . | . | . | E | . | . | |||
| Melaspilea | maculosa | N | . | . | . | . | . | . | . | |||
| Melaspilea | proximella | . | . | . | . | . | E | . | . | |||
| Melaspilea | tribuloides | N | . | . | . | . | . | . | . | |||
| Menegazzia | aenofusca | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | albida | . | . | . | S | . | . | . | . | |||
| Menegazzia | asahinae | . | . | . | . | . | . | . | As | |||
| Menegazzia | cincinnata | . | . | . | S | . | . | . | . | |||
| Menegazzia | dispora | . | . | . | S | . | . | . | . | |||
| Menegazzia | globulifera | . | . | . | S | . | . | . | . | |||
| Menegazzia | elongata | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | lucens | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | magellanica | . | . | . | S | . | . | . | . | |||
| Menegazzia | masafuerana | . | . | . | S | . | . | . | . | Imsh. | ||
| Menegazzia | megalospora | . | . | . | S | . | . | . | . | |||
| Menegazzia | neozelandica | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | nothofagi | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | opuntioides | . | . | . | S | . | . | . | . | |||
| Menegazzia | pertransita | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | platytrema | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | retipora | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | sanguinascens | . | . | . | S | Aus | . | . | . | |||
| Menegazzia | tenuis | . | . | . | S | . | . | . | . | |||
| Menegazzia | terebrata | N | MI | WI | . | . | E | . | . | |||
| Menegazzia | testacea | . | . | . | . | Aus | . | . | . | |||
| Menegazzia | weindorferi | . | . | . | . | Aus | . | . | . | |||
| Metus | conglomeratus | . | . | . | . | Aus | . | . | . | |||
| Metus | pileatus | . | . | . | S | . | . | . | . | |||
| Micarea | assimilata | N | . | . | . | . | . | . | . | |||
| Micarea | denigrata | N | . | . | . | . | . | . | . | |||
| Micarea | elachista | . | . | . | . | . | E | . | . | |||
| Micarea | erratica | N | MI | . | . | . | . | . | . | |||
| Micarea | incrassata | . | . | . | . | Aus | . | . | . | |||
| Micarea | lignaria | N | . | . | . | . | . | . | . | |||
| Micarea | melaena | N | MI | . | . | . | . | . | . | |||
| Micarea | neostipitata | . | MI | . | . | . | . | . | . | |||
| Micarea | nitschkeana | . | . | . | . | . | E | . | . | |||
| Micarea | peliocarpa | N | MI | . | . | . | . | . | . | |||
| Micarea | prasina | N | MI | . | . | . | E | . | . | |||
| Micarea | subnigrata | . | . | . | . | . | E | . | . | filed with Fuscidea austera | ||
| Micarea | sylvicola | N | . | . | . | . | E | . | . | |||
| Microcalicium | arenareum | N | . | . | . | . | . | . | . | |||
| Microglaena | masafueranum | . | . | . | S | . | . | . | . | Imsh. | ||
| Microglaena | selkerkii | . | . | . | S | . | . | . | . | Imsh. | ||
| Microthlia | cinerella | N | . | . | . | . | . | . | . | |||
| Microthaliopsis | aleana | N | . | . | . | . | . | . | . | |||
| Miriquidica | deusta | . | . | . | . | Aus | E | . | . | |||
| Miriquidica | griseoatra | . | . | . | . | . | E | . | . | |||
| Miriquidica | instrata | . | . | . | . | . | E | . | . | |||
| Miriquidica | leucophaea | . | . | . | . | . | E | . | . | |||
| Moelleropsis | nebulosa | . | . | . | . | . | E | . | . | |||
| Muellerella | hospitans | . | . | . | . | . | E | . | . | lichenicolous | ||
| Multiclavula | corynoides | . | . | . | . | . | E | . | . | |||
| Mycobilimbia | berengeriana | N | MI | . | . | . | . | . | . | |||
| Mycobilimbia | hypnorum | N | MI | . | . | . | E | . | . | |||
| Mycobilimbia | lobulata | N | . | . | . | . | E | . | . | |||
| Mycobilimbia | tetramera | . | MI | . | . | . | . | . | . | |||
| Mycoblastus | affinis | N | . | . | . | . | E | . | . | |||
| Mycoblastus | bryophilus | . | . | . | S | Aus | . | . | . | Imsh. | ||
| Mycoblastus | campbellianus | . | . | . | . | Aus | . | . | . | |||
| Mycoblastus | dissimulans | . | . | . | S | . | . | . | . | |||
| Mycoblastus | falklandicus | . | . | . | S | . | . | . | . | Imsh. | ||
| Mycoblastus | hypomelinus | . | . | . | . | Aus | . | . | . | |||
| Mycoblastus | sanguinarius | N | MI | WI | . | . | E | . | . | |||
| Mycocalicium | albonigrum | N | . | . | . | . | . | . | . | |||
| Mycocalicium | americanum | . | . | WI | . | . | . | . | . | |||
| Mycocalicium | subtile | N | MI | . | . | . | E | . | . | |||
| Mycoglaena | antillarum | . | . | WI | . | . | . | . | . | Imsh. | ||
| Mycoglaena | myricae | . | MI | . | . | . | E | . | . | |||
| Mycomicrothelia | subfallens | N | . | . | . | . | . | . | . | |||
| Mycomicrothelia | wallrothii | N | MI | . | . | . | . | . | . | |||
| Mycomicrothelia | willeyana | N | . | . | . | . | . | . | . | |||
| Mycoporellum | sp. | . | . | WI | . | . | . | . | . | |||
| Mycoporum | californicum | N | . | . | . | . | . | . | . | |||
| Mycoporum | compositum | N | MI | WI | . | . | . | . | . | |||
| Mycoporum | eschweileri | N | . | WI | . | . | . | . | . | |||
| Mycoporum | eucline | . | . | . | . | . | E | . | . | |||
| Mycoporum | lactaeum | N | . | . | . | . | E | . | . | |||
| Mycoporum | miserriman | . | . | . | . | . | E | . | . | |||
| Mycoporum | sparsellum | . | . | . | S | . | . | . | . | |||
| Myelochroa | aurulenta | N | MI | . | . | . | . | . | . | |||
| Myelochroa | galbina | N | MI | . | . | . | . | . | . | |||
| Myelochroa | lindmanii | . | . | . | S | . | . | . | . | |||
| Myelochroa | obsessa | N | . | . | . | . | . | . | . | |||
| Myelochroa | subaurulanta | . | . | . | . | . | . | . | As | |||
| Myelrrhiza | jenjiana | . | . | . | . | Aus | . | . | . | |||
| Mycomicrothelia | thelena | N | . | . | . | . | . | . | . | not in NA | ||
| Myriotrema | bahianum | N | . | WI | S | . | . | . | . | |||
| Myriotrema | clandestinum | N | . | . | . | . | . | . | . | not in NA | ||
| Myriotrema | compunctum | N | . | WI | . | . | . | . | . | |||
| Myriotrema | erodens | N | . | . | . | . | . | . | . | |||
| Myriotrema | glaucescens | N | . | WI | . | . | . | . | . | |||
| Myriotrema | hartii | . | . | . | S | . | . | . | . | |||
| Myriotrema | neofrondosum | . | . | . | S | . | . | . | . | |||
| Myriotrema | olivaceum | . | . | . | S | . | . | . | . | |||
| Myriotrema | peninsulae | N | . | . | . | . | . | . | . | |||
| Myriotrema | reclusum | N | . | WI | . | . | . | . | . | |||
| Myriotrema | rugiferum | N | . | . | . | . | . | . | . | |||
| Myriotrema | subcompunctum | N | . | . | . | . | . | . | . | |||
| Myriotrema | subwightii | . | . | . | S | . | . | . | . | |||
| Myriotrema | wightii | N | . | WI | S | . | . | . | . | |||
| Myxodictyon | chrysostictum | . | . | . | S | Aus | . | . | . |
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