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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8491 | Trichothelium chloroticum | (Ach.) R.C. Harris | No | Porina chlorotica f. chlorotica | 1171 | LC | ||||
| 8492 | Trichothelium guentheri | (Flot.) R.C. Harris | No | Porina guentheri var. guentheri | 1174 | LC NS | ||||
| 8493 | Trichothelium lineare | (Leight.) R.C. Harris | No | Porina linearis | 1182 | LC | ||||
| 8494 | Trichothyrina cetrariicola | (Nyl.) D. Hawksw. | No | Lichenopeltella cetrariicola | 2098 | NE NR | LF | |||
| 8495 | Trimmatostroma vandenboomii | Diederich (2024) | Yes | Trimmatostroma vandenboomii | 2903 | NE NR | LF | Trimmatostroma vandenboomii | ||
| 8496 | Trimmatothele perquisita | (Norman) Norman ex Zahlbr. (1903) | Yes | Trimmatothele perquisita | Verrucaria perquisita | 1439 | DD NR Sc | Trimmatothele perquisita | ||
| 8497 | Trimmatothelopsis benedarensis | (M. Knowles) K. Knudsen & Kocourk. (2021) | Yes | Trimmatothelopsis benedarensis | Acarospora benedarensis; Myriospora benedarenis | 7 | DD NR Sc | Trimmatothelopsis benedarensis | ||
| 8498 | Trimmatothelopsis rhizobola | (Nyl.) K. Knudsen & Lendemer (2016) | Yes | Trimmatothelopsis rhizobola | Acarospora rhizobola, Lecidea rhizobola, Psora rhizobola | 767 | VU D2 NR Sc | Trimmatothelopsis rhizobola | ||
| 8499 | Trimmatothelopsis smaragdula | (Wahlenb.) Cl. Roux & Nav.-Ros. (2011) | No | Acarospora smaragdula | 25 | LC | ||||
| 8500 | Tromera difformis | (Fr.) Arnold (1874) | No | Sarea difformis | ||||||
| 8501 | Tromera resinae | (Fr.) Körb. (1865) | No | Sarea resinae | ||||||
| 8502 | Tubeufia heterodermiae | Etayo (2002) | No | Lichenotubeufia heterodermiae | 2603 | LF | ||||
| 8503 | Tuckermannopsis chlorophylla | (Willd.) Hale (1987) | Yes | Tuckermannopsis chlorophylla | Cetraria chlorophylla; Nephromopsis chlorophylla; Tuckermanopsis chlorophylla | 327 | LC | Tuckermannopsis chlorophylla | ||
| 8504 | Tuckermanopsis chlorophylla | (Willd.) Hale [orth. error] | No | Tuckermannopsis chlorophylla | 327 | LC | ||||
| 8505 | Tylophoron hibernicum | (D. Hawksw., Coppins & P. James) Ertz, Diederich, Bungartz & Tibell (2011) | Yes | Tylophoron hibernicum | Blarneya hibernica | 185 | NT NR P Eng Wa IR | Tylophoron hibernicum | ||
| 8506 | Tylothallia biformigera | (Leight.) P. James & H. Kilias (1981) | Yes | Tylothallia biformigera | Catillaria biformigera | 1440 | LC | Tylothallia biformigera | ||
| 8507 | Umbilicaria arctica | (Ach.) Nyl. | No | incorrectly reported from the British Isles, BLS number 1444 no longer used | ||||||
| 8508 | Umbilicaria atropruinosa | (Schaer.) Schaer. | No | Umbilicaria leiocarpa | Umbilicaria leiocarpa DC., incorrectly reported from the British Isles | |||||
| 8509 | Umbilicaria coriacea | Imshaug | No | Umbilicaria rigida | Umbilicaria rigida (Du Rietz) Frey, incorrectly reported from the British Isles | |||||
| 8510 | Umbilicaria crustulosa | (Ach.) Lamy (1878) | Yes | Umbilicaria crustulosa | 1445 | VU D2 NR | Umbilicaria crustulosa | |||
| 8511 | Umbilicaria cylindrica | (L.) Delise (1830) | Yes | Umbilicaria cylindrica | Umbilicaria cylindrica var. deliseiUmbilicaria cylindrica var. denudataUmbilicaria cylindrica var. fimbriataUmbilicaria cylindrica var. laciniata | 1446 | LC | Umbilicaria cylindrica | ||
| 8512 | Umbilicaria cylindrica f. denticulata | (Ach.) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8513 | Umbilicaria cylindrica f. exasperata | (Turner & Borrer) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8514 | Umbilicaria cylindrica var. delisei | Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8515 | Umbilicaria cylindrica var. denudata | (Turner & Borrer) Frey | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8516 | Umbilicaria cylindrica var. fimbriata | (Ach.) Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8517 | Umbilicaria cylindrica var. laciniata | (Retz.) Zahlbr. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8518 | Umbilicaria cylindrica var. tornata | (Ach.) Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8519 | Umbilicaria decussata | (Vill.) Zahlbr. | No | incorrectly reported from the British Isles | ||||||
| 8520 | Umbilicaria deusta | (L.) Baumg. (1790) | Yes | Umbilicaria deusta | 1447 | LC NS | Umbilicaria deusta |