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 | Tremella tuckerae | Diederich (2007) | Yes | Tremella tuckerae | 2478 | NE NR | LF | Tremella tuckerae | ||
| 8312 | Tremolecia atrata | (Ach.) Hertel (1977) | Yes | Tremolecia atrata | Lecidea dicksonii | 1438 | LC | |||
| 8313 | Tremolecia jurana | (Schaer.) Hertel | No | Farnoldia jurana | 863 | LC NS | ||||
| 8314 | Trichia furfuracea | (L.) With. | No | Chaenotheca furfuracea | 466 | LC | ||||
| 8315 | Trichoconis lichenicola | D. Hawksw. (1980) | Yes | Trichoconis lichenicola | 2255 | LF | Trichoconis lichenicola | |||
| 8316 | Trichonectria aculeata | Kirschst. | No | Trichonectria hirta | 2256 | NE NR | LF | |||
| 8317 | Trichonectria anisospora | (Lowen) van den Boom & Diederich | No | Pronectria anisospora | 2171 | LC NS | LF | |||
| 8318 | Trichonectria hirta | (A. Bloxam) Petch (1937) | Yes | Trichonectria hirta | 2256 | NE NR | LF | Trichonectria hirta | ||
| 8319 | Trichonectria pertusariae | Etayo & van den Boom (2005) | Yes | Trichonectria pertusariae | 2699 | parasitic on Pertusaria (Lepra) spp. | NE NR | LF | ||
| 8320 | Trichonectria rubefaciens | (Ellis & Everh.) Diederich & Schroers (1999) | No | Nectriopsis rubefaciens | 2126 | NE NR | LF | |||
| 8321 | Trichosphaeria lichenum | P. Karst. & Har. (1890) | Yes | Trichosphaeria lichenum | 2712 | lichenicolous on Peltigera; probably belongs in Niesslia | LF | |||
| 8322 | Trichothecium roseum | (Pers.) Link (1809) | Yes | Trichothecium roseum | 2257 | NE ? | LF | |||
| 8323 | Trichothelium aeneum | (Wallr.) R.C. Harris | No | Porina aenea | 1168 | LC | ||||
| 8324 | Trichothelium chloroticum | (Ach.) R.C. Harris | No | Porina chlorotica f. chlorotica | 1171 | LC | ||||
| 8325 | Trichothelium guentheri | (Flot.) R.C. Harris | No | Porina guentheri var. guentheri | 1174 | LC NS | ||||
| 8326 | Trichothelium lineare | (Leight.) R.C. Harris | No | Porina linearis | 1182 | LC | ||||
| 8327 | Trichothyrina cetrariicola | (Nyl.) D. Hawksw. | No | Lichenopeltella cetrariicola | 2098 | NE NR | LF | |||
| 8328 | Trimmatothele perquisita | (Norman) Norman ex Zahlbr. (1903) | Yes | Trimmatothele perquisita | Verrucaria perquisita | 1439 | DD NR Sc | Trimmatothele perquisita | ||
| 8329 | Trimmatothelopsis benedarensis | (M. Knowles) K. Knudsen & Kocourk. (2021) | Yes | Trimmatothelopsis benedarensis | Acarospora benedarensis; Myriospora benedarenis | 7 | DD NR Sc | Trimmatothelopsis benedarensis | ||
| 8330 | Trimmatothelopsis rhizobola | (Nyl.) K. Knudsen & Lendemer (2016) | Yes | Trimmatothelopsis rhizobola | Acarospora rhizobola, Lecidea rhizobola, Psora rhizobola | 767 | VU D2 NR Sc | Trimmatothelopsis rhizobola | ||
| 8331 | Trimmatothelopsis smaragdula | (Wahlenb.) Cl. Roux & Nav.-Ros. (2011) | No | Acarospora smaragdula | 25 | LC | ||||
| 8332 | Tubeufia heterodermiae | Etayo (2002) | No | Lichenotubeufia heterodermiae | 2603 | LF | ||||
| 8333 | Tuckermannopsis chlorophylla | (Willd.) Hale (1987) | Yes | Tuckermannopsis chlorophylla | Cetraria chlorophylla; Nephromopsis chlorophylla; Tuckermanopsis chlorophylla | 327 | LC | Tuckermannopsis chlorophylla | ||
| 8334 | Tuckermanopsis chlorophylla | (Willd.) Hale [orth. error] | No | Tuckermannopsis chlorophylla | 327 | LC | ||||
| 8335 | 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 | ||
| 8336 | Tylothallia biformigera | (Leight.) P. James & H. Kilias (1981) | Yes | Tylothallia biformigera | Catillaria biformigera | 1440 | LC | Tylothallia biformigera | ||
| 8337 | Umbilicaria arctica | (Ach.) Nyl. | No | 1444 | incorrectly reported from the British Isles, BLS number no longer used | |||||
| 8338 | Umbilicaria atropruinosa | (Schaer.) Schaer. | No | Umbilicaria leiocarpa | Umbilicaria leiocarpa DC., incorrectly reported from the British Isles | |||||
| 8339 | Umbilicaria coriacea | Imshaug | No | Umbilicaria rigida | Umbilicaria rigida (Du Rietz) Frey, incorrectly reported from the British Isles | |||||
| 8340 | Umbilicaria crustulosa | (Ach.) Lamy (1878) | Yes | Umbilicaria crustulosa | 1445 | VU D2 NR | Umbilicaria crustulosa |