For more information see the Supplementary Notes for the Taxon Dictionary, which explains the names and synonyms, and these Instructions on how to use the online Taxon Dictionary which includes details of the Conservation Evaluation codes.
| Count | Name | Authority | Is Current Name? | Current Taxon Name | Synonyms | BLS Number | Comments | Conservation Evaluation | Group | Account & Map |
|---|---|---|---|---|---|---|---|---|---|---|
| 8311 | Thelocarpon strasseri | Zahlbr. (1902) | Yes | Thelocarpon strasseri | 1902 | LC NR | Thelocarpon strasseri | |||
| 8312 | Thelocarpon superellum | Nyl. (1866) | Yes | Thelocarpon superellum | 1405 | LC NR | Thelocarpon superellum | |||
| 8313 | Thelomma ocellatum | (Körb.) Tibell (1976) | No | Pseudothelomma ocellatum | 1406 | LC NS | ||||
| 8314 | Thelopsis corticola | (Coppins & P. James) Sanderson & Ertz (2021) | Yes | Thelopsis corticola | Opegrapha corticola | 945 | LC IR | Thelopsis corticola | ||
| 8315 | Thelopsis isiaca | Stizenb. (1895) | Yes | Thelopsis isiaca | 957 | DD NR | Thelopsis isiaca | |||
| 8316 | Thelopsis melathelia | Nyl. (1864) | No | Ramonia melathelia | 1407 | NT NR Sc | ||||
| 8317 | Thelopsis rubella | Nyl. (1855) | Yes | Thelopsis rubella | 1408 | LC L | Thelopsis rubella | |||
| 8318 | Thelotrema agelaea | (Ach.) Gray | No | Phlyctis agelaea | 1109 | NT NS Sc | ||||
| 8319 | Thelotrema hutchinsiae | Borrer | No | Pertusaria hutchinsiae | 1086 | |||||
| 8320 | Thelotrema isidioides | (Borrer) R. Sant. (1980) | No | Leucodecton isidioides | 1409 | NE (Ireland only) | ||||
| 8321 | Thelotrema lepadinum | (Ach.) Ach. (1803) | Yes | Thelotrema lepadinum | Thelotrema lepadinum var. scutelliforme | 1410 | LC L* | Thelotrema lepadinum | ||
| 8322 | Thelotrema lepadinum f. rupestre | (Turner) Cromb. | No | Thelotrema lepadinum | 1410 | LC L* | ||||
| 8323 | Thelotrema lepadinum var. rupestre | Turner | No | Thelotrema lepadinum | 1410 | LC L* | ||||
| 8324 | Thelotrema lepadinum var. scutelliforme | Ach. | No | Thelotrema lepadinum | 1410 | LC L* | ||||
| 8325 | Thelotrema lueckingii | Breuss (2013) | Yes | Thelotrema lueckingii | 2836 | NE NR | Thelotrema lueckingii | |||
| 8326 | Thelotrema macrosporum | P.M. Jørg. & P. James (1995) | Yes | Thelotrema macrosporum | Thelotrema monosporum auct. europ. | 1411 | LC NS Sc IR | Thelotrema macrosporum | ||
| 8327 | Thelotrema melaleucum | (Sm.) Turner & Borrer | No | Pertusaria pustulata | 1092 | VU B NR Eng | ||||
| 8328 | Thelotrema monosporum | auct. brit., non Nyl. | No | Thelotrema macrosporum | 1411 | LC NS Sc IR | ||||
| 8329 | Thelotrema petractoides | P.M. Jørg. & Brodo (1995) | No | Crutarndina petractoides | 1412 | LC Sc IR | ||||
| 8330 | Thelotrema subtile | auct. brit., non Tuck. | No | Thelotrema petractoides | 1412 | LC Sc IR | ||||
| 8331 | Thermutis compacta | (Agardh) A.L. Sm. | No | Scytonema | non-lichenized Scytonema sp. {cyanobacterium} | CBM | ||||
| 8332 | Thermutis velutina | (Ach.) Flot. (1850) | Yes | Thermutis velutina | 1413 | NT NR Sc | Thermutis velutina | |||
| 8333 | Thrombium aoristoides | I.M. Lamb | No | Thrombium epigaeum | 1414 | LC NS | ||||
| 8334 | Thrombium cretaceum | Walt. Watson | No | Watsoniomyces obsoletus | 740 | LC NS ?E IR | ||||
| 8335 | Thrombium epigaeum | (Pers.) Wallr. (1831) | Yes | Thrombium epigaeum | 1414 | LC NS | Thrombium epigaeum | |||
| 8336 | Thrombium laetevirens | A.L. Sm. (1911) | No | Wahlenbergiella mucosa | 1506 | LC | ||||
| 8337 | Thrombium thelostomum | (Ach. ex J. Harriman) A.L. Sm. | No | Pyrenocarpon thelostomum | 1813 | DD NR | ||||
| 8338 | Thyrea radiata | (Sommerf.) Zahlbr. | No | Lempholemma radiatum | 818 | NT NR Sc | ||||
| 8339 | Tichothecium calcaricola | (Mudd) Arnold (1874) | No | Endococcus rugulosus | 2061 | NE NR | LF | |||
| 8340 | Tichothecium cerinarium | (Mudd) Berl & Voglino | No | ? Lichenodiplis lecanorae {LF} | LF |