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 Sort ascending | Authority | Is Current Name? | Current Taxon Name | Synonyms | BLS Number | Comments | Conservation Evaluation | Group | Account & Map |
|---|---|---|---|---|---|---|---|---|---|---|
| 751 | Tomasellia lactea | (Ach.) R.C. Harris | No | Mycoporum lacteum | 1576 | NT NS Sc | F | |||
| 752 | Tomasellia ischnobela | (Nyl.) Keissl. | No | Celothelium ischnobelum | 1566 | LC | ||||
| 753 | Tomasellia gelatinosa | (Chevall.) Zahlbr. (1922) | Yes | Tomasellia gelatinosa | Melanotheca gelatinosa | 1565 | LC | F | Tomasellia gelatinosa | |
| 754 | Tomasellia diffusa | (Leight.) J. Lahm (1885) | Yes | Tomasellia diffusa | Melanotheca diffusa | 1730 | LC NR Sc | F | Tomasellia diffusa | |
| 755 | Toensbergia leucococca | (R. Sant.) Bendiksby & Timdal (2013) | Yes | Toensbergia leucococca | Hypocenomyce leucococca; Pycnora leucococca | 1868 | DD NR Sc | Toensbergia leucococca | ||
| 756 | Toensbergia geminipara | (Th. Fr.) T. Sprib. & Resl (2020) | Yes | Toensbergia geminipara | Ochrolechia geminipara; Pertusaria geminipara | 923 | NT NR Sc | Toensbergia geminipara | ||
| 757 | Tingiopsidium elaeinum | (Wahlenb.) Hafellner & T. Sprib. (2016) | No | Vestergrenopsis elaeina | 1822 | VU D2 NR Sc | ||||
| 758 | Tichothecium vermicularium | (Linds.) Arnold | No | incorrectly reported from the British Isles | LF | |||||
| 759 | Tichothecium stigma | auct. | No | Endococcus perpusillus | 2059 | NE NR | LF | |||
| 760 | Tichothecium stereocaulicola | (Linds.) Arnold | No | Polycoccum trypethelioides | 2169 | NT NR | LF | |||
| 761 | Tichothecium squamarioides | (Mudd) G. Winter | No | Polycoccum squamarioides | 2168 | NE NR | LF | |||
| 762 | Tichothecium rugulosum | (Nyl.) Arnold | No | Endococcus rugulosus | 2061 | NE NR | LF | |||
| 763 | Tichothecium rimosicola | (Leight.) Arnold (1861) | No | Phaeospora rimosicola | 2142 | LC NR | LF | |||
| 764 | Tichothecium pygmaeum var. ventosicola | (Mudd) G. Winter | No | Muellerella ventosicola | 2120 | NE NR | LF | |||
| 765 | Tichothecium pygmaeum var. erraticum | (A. Massal.) Vouaux | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 766 | Tichothecium pygmaeum var. ecatonosporum | (Anzi) G. Winter | No | Muellerella pygmaea | 2118 | LC | LF | |||
| 767 | Tichothecium pygmaeum | Körb. | No | Muellerella pygmaea | 2118 | LC | LF | |||
| 768 | Tichothecium perpusillum | (Nyl.) Arnold (1874) | No | Endococcus perpusillus | 2059 | NE NR | LF | |||
| 769 | Tichothecium lichenicola | (Sommerf.) R. Sant. (1960) | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 770 | Tichothecium gemmiferum | auct. | No | Endococcus propinquus | 2060 | LC NS | LF | |||
| 771 | Tichothecium erraticum | A. Massal. | No | Muellerella lichenicola | 2116 | LC | LF | |||
| 772 | Tichothecium cerinarium | (Mudd) Berl & Voglino | No | ? Lichenodiplis lecanorae {LF} | LF | |||||
| 773 | Tichothecium calcaricola | (Mudd) Arnold (1874) | No | Endococcus rugulosus | 2061 | NE NR | LF | |||
| 774 | Thyrea radiata | (Sommerf.) Zahlbr. | No | Lempholemma radiatum | 818 | NT NR Sc | ||||
| 775 | Thrombium thelostomum | (Ach. ex J. Harriman) A.L. Sm. | No | Pyrenocarpon thelostomum | 1813 | DD NR | ||||
| 776 | Thrombium laetevirens | A.L. Sm. (1911) | No | Wahlenbergiella mucosa | 1506 | LC | ||||
| 777 | Thrombium epigaeum | (Pers.) Wallr. (1831) | Yes | Thrombium epigaeum | 1414 | LC NS | Thrombium epigaeum | |||
| 778 | Thrombium cretaceum | Walt. Watson | No | Watsoniomyces obsoletus | 740 | LC NS ?E IR | ||||
| 779 | Thrombium aoristoides | I.M. Lamb | No | Thrombium epigaeum | 1414 | LC NS | ||||
| 780 | Thermutis velutina | (Ach.) Flot. (1850) | Yes | Thermutis velutina | 1413 | NT NR Sc | Thermutis velutina |