Lichen Taxa held in MSC
| Genus | Species | N | MI | WI | S | Aus | E | Af | As | Notes | ||
| Tapellaria | bilimbioides | . | . | WI | . | . | . | . | . | |||
| Tapellaria | epiphylla | N | . | WI | . | . | . | . | . | |||
| Tapellaria | nana | N | . | WI | . | . | . | . | . | |||
| Tapellaria | nigrata | . | . | WI | . | . | . | . | . | |||
| Teloschistes | californicus | N | . | . | . | . | . | . | . | |||
| Teloschistes | chrysophthalmus | N | MI | . | . | Aus | E | Af | . | |||
| Teloschistes | contortuplicatus | N | . | . | . | . | . | . | . | |||
| Teloschistes | exilis | N | . | WI | S | . | . | Af | . | |||
| Teloschistes | fasciculatus | . | . | . | . | Aus | . | . | . | |||
| Teloschistes | flavicans | N | . | WI | S | Aus | E | . | . | |||
| Teloschistes | perrugosus | . | . | . | . | . | . | Af | . | |||
| Teloschistes | peruensis | . | . | . | S | . | . | . | . | |||
| Teloschistes | puber | . | . | . | . | . | . | Af | . | |||
| Teloschistes | sieberianus | . | . | . | . | Aus | . | . | . | |||
| Teloschistes | velifer | . | . | . | . | Aus | . | . | . | |||
| Teloschistes | villosus | . | . | . | . | . | . | Af | . | |||
| Temnospora | fugens | . | . | WI | . | . | . | Af | . | |||
| Tephromela | aglaea | N | . | . | . | . | E | . | . | |||
| Tephromela | arafurensis | . | . | . | . | Aus | . | . | . | |||
| Tephromela | armeniaca | N | . | . | . | . | . | . | . | |||
| Tephromela | atra | N | . | WI | S | Aus | . | . | . | |||
| Tephromela | atrocaesia | . | . | . | . | Aus | . | . | . | |||
| Tephromela | nashii | N | . | . | . | . | . | . | . | |||
| Tephromela | testaceoatra | . | . | . | . | . | E | . | . | |||
| Texosporium | antillarum | . | . | WI | . | . | . | . | . | Comm. & Imsh. | ||
| Thallotrema | antilliense | . | . | WI | . | . | . | . | . | Comm. & Imsh. | ||
| Thamnolia | vermicularis | N | . | . | S | Aus | E | . | . | |||
| Thelenella | fernandezianum | . | . | . | S | . | . | . | . | |||
| Thelenella | modesta | . | . | . | . | . | E | . | . | |||
| Thelidium | aeneovinosum | . | . | . | . | . | E | . | . | |||
| Thelidium | minimum | N | . | . | . | . | . | . | . | |||
| Thelidium | minutulum | . | MI | . | . | . | . | . | . | |||
| Thelidium | olivaceum | . | . | . | . | . | E | . | . | |||
| Thelidium | papulare | . | MI | . | . | . | E | . | . | |||
| Thelidium | pyrenophorum | N | . | . | . | . | . | . | . | |||
| Thelocarpon | epibolum | N | . | . | . | . | . | . | . | |||
| Thelocarpon | superellum | N | . | . | . | . | . | . | . | |||
| Thelocarpon | strasseni | . | . | . | . | . | E | . | . | |||
| Thelomma | californicum | N | . | . | . | . | . | . | . | |||
| Thelomma | carolinianum | N | . | . | . | . | . | . | . | |||
| Thelomma | mammosum | . | . | . | . | . | E | . | . | |||
| Thelomma | occidentale | N | . | . | . | . | . | . | . | |||
| Thelomma | santessonii | N | . | . | . | . | . | . | . | |||
| Thelomma | siliceum | . | . | . | . | . | E | . | . | |||
| Thelopsis | inordinata | N | . | . | . | . | . | . | . | |||
| Thelopsis | isiaca | . | . | . | . | . | E | . | . | |||
| Thelotrema | adjectum | N | . | . | . | . | . | . | . | |||
| Thelotrema | concretum | . | . | WI | . | . | . | . | . | |||
| Thelotrema | confluens | N | . | . | . | . | . | . | . | |||
| Thelotrema | defectum | N | . | . | . | . | . | . | . | |||
| Thelotrema | depressum | . | . | WI | . | . | . | . | . | |||
| Thelotrema | dilatatum | N | . | . | . | . | . | . | . | |||
| Thelotrema | fernandezianum | . | . | . | S | . | . | . | . | |||
| Thelotrema | glaucopallens | . | . | WI | . | . | . | . | . | |||
| Thelotrema | hartii | . | . | WI | . | . | . | . | . | |||
| Thelotrema | interpositum | N | . | . | . | . | . | . | . | mis-IDs for NA | ||
| Thelotrema | lathraeum | N | . | . | . | . | . | . | . | |||
| Thelotrema | lepadinum | N | . | . | S | Aus | E | . | . | |||
| Thelotrema | leprocarpum | N | . | . | . | . | . | . | . | |||
| Thelotrema | leucomelaneum | . | . | WI | . | . | . | . | . | |||
| Thelotrema | monospermum | N | . | . | . | . | . | . | . | |||
| Thelotrema | monosporum | . | . | WI | S | . | . | . | . | |||
| Thelotrema | meridense | . | . | WI | . | . | . | . | . | |||
| Thelotrema | myriocarpum | . | . | WI | . | . | . | . | . | |||
| Thelotrema | paralbidum | . | . | WI | . | . | . | . | . | |||
| Thelotrema | patagonica | . | . | . | S | . | . | . | . | |||
| Thelotrema | santense | N | . | . | . | . | . | . | . | |||
| Thelotrema | selkirkii | . | . | . | S | . | . | . | . | Imsh. | ||
| Thelotrema | subtile | N | . | . | S | . | E | . | . | |||
| Thermutis | velutina | N | MI | . | . | . | E | . | . | |||
| Tholurna | dissimilis | N | . | . | . | . | E | . | . | |||
| Thrombium | epigaeum | N | . | . | . | . | E | . | . | |||
| Thyrea | pulvinatum | N | . | . | . | . | . | . | . | |||
| Thysanthecium | hookeri | . | . | . | . | Aus | . | . | . | |||
| Thysanthecium | scutellatum | . | . | . | . | Aus | . | . | . | |||
| Tomasellia | arthonioides | . | . | . | . | . | E | . | . | |||
| Tomasellia | gelatinosa | N | . | . | . | . | E | . | . | |||
| Tomasellia | wetmorei | N | . | . | . | . | . | . | . | |||
| Toninia | aromatica | N | . | . | . | . | . | . | . | |||
| Toninia | bullata | . | . | . | S | Aus | . | . | . | |||
| Toninia | candida | N | . | . | . | . | E | . | . | |||
| Toninia | cinereovirens | . | . | . | . | . | E | . | . | |||
| Toninia | fernandeziana | . | . | . | S | . | . | . | . | |||
| Toninia | fusispora | N | . | . | . | . | . | . | . | ?T. aromatica | ||
| Toninia | magellanica | . | . | . | S | . | . | . | . | |||
| Toninia | massata | N | . | . | . | . | . | . | . | |||
| Toninia | meridionalis | . | . | . | . | . | E | . | . | |||
| Toninia | philippea | . | . | . | . | . | E | . | . | |||
| Toninia | ruginosa | N | . | . | . | . | . | . | . | |||
| Toninia | sedifolia | N | MI | . | . | . | E | . | . | |||
| Toninia | squalida | N | . | . | . | . | E | . | . | |||
| Toninia | thiospora | . | . | . | . | . | E | . | . | |||
| Toninia | tristis | N | . | . | . | . | E | . | . | |||
| Tornabea | scutellifera | . | . | . | S | . | E | . | . | |||
| Trapelia | coarctata | N | MI | . | S | . | E | . | . | |||
| Trapelia | geophila | . | . | . | . | . | E | . | . | |||
| Trapelia | mooreana | . | . | . | . | . | E | . | . | |||
| Trapeliopsis | aeneofusca | . | . | . | . | . | E | . | . | |||
| Trapeliopsis | congregans | . | . | . | . | Aus | . | . | . | |||
| Trapeliopsis | flexuosa | N | . | . | . | . | . | . | . | |||
| Trapeliopsis | gelatinosa | N | MI | . | . | . | . | . | . | |||
| Trapeliopsis | granulosa | N | MI | WI | . | . | E | . | . | |||
| Trapeliopsis | viridescens | N | MI | . | . | . | . | . | . | |||
| Trapeliopsis | wallrothii | . | . | . | . | . | E | . | . | |||
| Tremella | parmeliarum | N | . | . | . | . | . | . | . | |||
| Tremolecia | atrata | N | . | . | S | Aus | E | . | . | |||
| Tricharia | albostrigosa | . | . | WI | . | . | . | . | . | |||
| Tricharia | helminthospora | N | . | . | . | . | . | . | . | not in NA | ||
| Tricharia | vulgaris | . | . | WI | . | . | . | . | . | |||
| Trichoramalina | crinita | N | . | . | . | . | . | . | . | |||
| Trichothelium | aeneum | . | . | . | . | . | E | . | . | |||
| Trichothelium | chloroticum | N | . | . | . | . | E | . | . | |||
| Trichothelium | epiphyllum | N | . | . | . | . | . | . | . | |||
| Trichothelium | grandis | . | . | . | . | . | E | . | . | |||
| Trichothelium | guentheri | var. | lucens | . | . | . | . | . | E | . | . | |
| Trichothelium | ninus | . | . | WI | . | . | . | . | . | |||
| Trichothelium | nitidulum | N | . | WI | . | . | . | . | . | |||
| Trichothelium | thaxteri | N | . | . | . | . | . | . | . | |||
| Trypethelium | aeneum | N | . | . | . | . | . | . | . | |||
| Trypethelium | annulare | . | . | WI | . | . | . | . | . | |||
| Trypethelium | buckii | . | . | . | S | . | . | . | . | |||
| Trypethelium | degenerans | . | . | WI | . | . | . | . | . | |||
| Trypethelium | eluteriae | N | . | WI | . | . | . | . | . | |||
| Trypethelium | fernandezianum | . | . | . | S | . | . | . | . | |||
| Trypethelium | floridanum | N | . | . | . | . | . | . | . | |||
| Trypethelium | mastiodeum | N | . | WI | . | . | . | . | . | not in NA | ||
| Trypethelium | nitidiusculum | N | . | WI | . | . | . | . | . | |||
| Trypethelium | ochroleucum | N | . | WI | . | . | . | . | . | |||
| Trypethelium | tropicum | N | . | WI | S | . | . | . | . | |||
| Trypethelium | virens | N | MI | . | . | . | . | . | . | |||
| Trypethelium | umberium | N | . | WI | . | . | . | . | . | |||
| Tuckermannopsis | americana | N | MI | . | . | . | . | . | . | |||
| Tuckermannopsis | chlorophylla | N | . | . | S | . | E | . | . | |||
| Tuckermannopsis | ciliaris | N | MI | . | . | . | . | . | As | |||
| Tuckermannopsis | coralligera | N | . | . | . | . | . | . | . | |||
| Tuckermannopsis | fendleri | N | MI | . | . | . | . | . | . | |||
| Tuckermannopsis | orbata | N | MI | . | . | . | . | . | . | |||
| Tuckermannopsis | platyphylla | N | . | . | . | . | . | . | . | |||
| Tuckermannopsis | sepincola | N | MI | . | S | . | . | . | . | |||
| Tuckermannopsis | subalpina | N | . | . | . | . | . | . | . | |||
| Tuckneraria | laueri | . | . | . | . | . | E | . | . | |||
| Turgidosculum | complicatulum | . | . | . | S | Aus | . | . | . | |||
| Tylophoron | protrudens | N | . | . | . | . | . | . | . | |||
| Tylothallia | biformigera | . | . | . | . | . | E | . | . | |||
| Tylothallia | pahiensis | . | . | . | . | Aus | . | . | . |
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | Pa | Pi | Q | R | S | T | U | V | W | X | Y | Z | Types |