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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8221 | Thermutis compacta | (Agardh) A.L. Sm. | No | Scytonema | non-lichenized Scytonema sp. {cyanobacterium} | CBM | ||||
| 8222 | Thermutis velutina | (Ach.) Flot. (1850) | Yes | Thermutis velutina | 1413 | NT NR Sc | Thermutis velutina | |||
| 8223 | Thrombium aoristoides | I.M. Lamb | No | Thrombium epigaeum | 1414 | LC NS | ||||
| 8224 | Thrombium cretaceum | Walt. Watson | No | Watsoniomyces obsoletus | 740 | LC NS ?E IR | ||||
| 8225 | Thrombium epigaeum | (Pers.) Wallr. (1831) | Yes | Thrombium epigaeum | 1414 | LC NS | Thrombium epigaeum | |||
| 8226 | Thrombium laetevirens | A.L. Sm. (1911) | No | Wahlenbergiella mucosa | 1506 | LC | ||||
| 8227 | Thrombium thelostomum | (Ach. ex J. Harriman) A.L. Sm. | No | Pyrenocarpon thelostomum | 1813 | DD NR | ||||
| 8228 | Thyrea radiata | (Sommerf.) Zahlbr. | No | Lempholemma radiatum | 818 | NT NR Sc | ||||
| 8229 | Tichothecium calcaricola | (Mudd) Arnold (1874) | No | Endococcus rugulosus | 2061 | NE NR | LF | |||
| 8230 | Tichothecium cerinarium | (Mudd) Berl & Voglino | No | ? Lichenodiplis lecanorae {LF} | LF | |||||
| 8231 | Tichothecium erraticum | A. Massal. | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 8232 | Tichothecium gemmiferum | auct. | No | Endococcus propinquus | 2060 | LC NS | LF | |||
| 8233 | Tichothecium lichenicola | (Sommerf.) R. Sant. (1960) | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 8234 | Tichothecium perpusillum | (Nyl.) Arnold (1874) | No | Endococcus perpusillus | 2059 | NE NR | LF | |||
| 8235 | Tichothecium pygmaeum | Körb. | No | Muellerella pygmaea | 2118 | LC | LF | |||
| 8236 | Tichothecium pygmaeum var. ecatonosporum | (Anzi) G. Winter | No | Muellerella pygmaea | 2118 | LC | LF | |||
| 8237 | Tichothecium pygmaeum var. erraticum | (A. Massal.) Vouaux | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 8238 | Tichothecium pygmaeum var. ventosicola | (Mudd) G. Winter | No | Muellerella ventosicola | 2120 | NE NR | LF | |||
| 8239 | Tichothecium rimosicola | (Leight.) Arnold (1861) | No | Phaeospora rimosicola | 2142 | LC NR | LF | |||
| 8240 | Tichothecium rugulosum | (Nyl.) Arnold | No | Endococcus rugulosus | 2061 | NE NR | LF | |||
| 8241 | Tichothecium squamarioides | (Mudd) G. Winter | No | Polycoccum squamarioides | 2168 | NE NR | LF | |||
| 8242 | Tichothecium stereocaulicola | (Linds.) Arnold | No | Polycoccum trypethelioides | 2169 | NT NR | LF | |||
| 8243 | Tichothecium stigma | auct. | No | Endococcus perpusillus | 2059 | NE NR | LF | |||
| 8244 | Tichothecium vermicularium | (Linds.) Arnold | No | incorrectly reported from the British Isles | LF | |||||
| 8245 | Tingiopsidium elaeinum | (Wahlenb.) Hafellner & T. Sprib. (2016) | No | Vestergrenopsis elaeina | 1822 | VU D2 NR Sc | ||||
| 8246 | Toensbergia geminipara | (Th. Fr.) T. Sprib. & Resl (2020) | Yes | Toensbergia geminipara | Ochrolechia geminipara; Pertusaria geminipara | 923 | NT NR Sc | Toensbergia geminipara | ||
| 8247 | Toensbergia leucococca | (R. Sant.) Bendiksby & Timdal (2013) | Yes | Toensbergia leucococca | Hypocenomyce leucococca; Pycnora leucococca | 1868 | DD NR Sc | Toensbergia leucococca | ||
| 8248 | Tomasellia diffusa | (Leight.) J. Lahm (1885) | Yes | Tomasellia diffusa | Melanotheca diffusa | 1730 | LC NR Sc | F | Tomasellia diffusa | |
| 8249 | Tomasellia gelatinosa | (Chevall.) Zahlbr. (1922) | Yes | Tomasellia gelatinosa | Melanotheca gelatinosa | 1565 | LC | F | Tomasellia gelatinosa | |
| 8250 | Tomasellia ischnobela | (Nyl.) Keissl. | No | Celothelium ischnobelum | 1566 | LC |