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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8191 | Taeniolella toruloides | Heuchert & Diederich (2016) | Yes | Taeniolella toruloides | 2690 | parasitic on Thelotrema lepadinum | NE NR | LF | Taeniolella toruloides | |
| 8192 | Taeniolina scripta | (P. Karst.) P.M. Kirk (1981) | Yes | Taeniolina scripta | Taeniolella scripta | 2244 | NE NR | LF | Taeniolina scripta | |
| 8193 | Talpapellis beschiana | (Diederich) Zhurb., U. Braun, Diederich & Heucher (2018) | Yes | Talpapellis beschiana | Taeniolella beschiana | 2309 | lichenicolous on Cladonia spp. | NE NR | LF | Talpapellis beschiana |
| 8194 | Telogalla olivieri | (Vouaux) Nik. Hoffm. & Hafellner (2000) | Yes | Telogalla olivieri | Guignardia olivieri | 2068 | NE NR | LF | Telogalla olivieri | |
| 8195 | Teloschistes chrysophthalmos | (L.) Th. Fr. (1860) | Yes | Teloschistes chrysophthalmos | Teloschistes chrysophthalmus | 1380 | CR B, C2, D NR P | Teloschistes chrysophthalmos | ||
| 8196 | Teloschistes chrysophthalmus | (L.) Th. Fr. (1860) [orth. var.] | No | Teloschistes chrysophthalmos | 1380 | CR B, C2, D NR P | ||||
| 8197 | Teloschistes chrysophthalmus var. dickieanus | (Linds.) Zahlbr. (1931) | No | Teloschistes chrysophthalmos | 1380 | CR B, C2, D NR P | ||||
| 8198 | Teloschistes flavicans | (Sw.) Norman (1853) | Yes | Teloschistes flavicans | 1381 | VU A NS P Eng Wa S8 | Teloschistes flavicans | |||
| 8199 | Tephromela aglaea | (Sommerf.) Hertel & Rambold (1885) | No | Calvitimela aglaea | 693 | LC NS | ||||
| 8200 | Tephromela armeniaca | (DC.) Hertel & Rambold | No | Calvitimela armeniaca | 697 | LC NR Sc | ||||
| 8201 | Tephromela atra var. atra | (Huds.) Hafellner (1983) | Yes | Tephromela atra var. atra | Lecanora atra | 630 | LC | Tephromela atra var. atra | ||
| 8202 | Tephromela atra var. torulosa | (Flot.) Hafellner (1992) | Yes | Tephromela atra var. torulosa | 2349 | LC NS | Tephromela atra var. torulosa | |||
| 8203 | Tephromela grumosa | (Pers.) Hafellner & Cl. Roux (1985) | Yes | Tephromela grumosa | Lecanora atra var. grumosa Lecanora grumosa |
654 | LC | Tephromela grumosa | ||
| 8204 | Tephromela pertusarioides | (Degel.) Hafellner & Cl. Roux (1985) | Yes | Tephromela pertusarioides | 1810 | DD NR | Tephromela pertusarioides | |||
| 8205 | Tetramelas insignis | (Körb.) Kalb (2004) | Yes | Tetramelas insignis | Buellia insignis | 208 | CR D NR Sc | Tetramelas insignis | ||
| 8206 | Tetramelas papillatus | (Sommerf.) Kalb (2004) | Yes | Tetramelas papillatus | Buellia papillata | 256 | CR D NR Sc | Tetramelas papillatus | ||
| 8207 | Tetramelas pulverulentus | (Anzi) A. Nordin & Tibell (2005) | Yes | Tetramelas pulverulentus | Buellia pulverulenta; Diplotomma pulverulenta | 1855 | NE NR Sc | Tetramelas pulverulentus | ||
| 8208 | Tetramelos pulverulentus | |||||||||
| 8209 | Thalloidima candidum | (Weber) A. Massal. (1852) | No | incorrectly reported from the British Isles | ||||||
| 8210 | Thalloidima coeruleonigricans | auct. | No | Thalloidima sedifolium | 1416 | LC P Eng Wa | ||||
| 8211 | Thalloidima cumulatum | (Sommerf.) Hellb. | No | Stereocaulon cumulatum | 1419 | Ex | ||||
| 8212 | Thalloidima diffractum | (A. Massal.) A. Massal. (1853) | Yes | Thalloidima diffractum | Toninia diffracta | 1903 | DD NR Sc | Thalloidima diffractum | ||
| 8213 | Thalloidima opuntioides | (Vill.) Kistenich, Timdal, Bendiksby & S. Ekman (2018) | Yes | Thalloidima opuntioides | Toninia opuntioides | 1905 | Not extinct. Needs re-evaluating | NR | Thalloidima opuntioides | |
| 8214 | Thalloidima physaroides | (Opiz) Kistenich, Timdal, Bendiksby & S. Ekman (2018) | Yes | Thalloidima physaroides | Toninia lurida; Toninia physaroides | 1906 | CR B2, C2 NR P Eng | Thalloidima physaroides | ||
| 8215 | Thalloidima rosulatum | Anzi (1868) | Yes | Thalloidima rosulatum | Toninia rosulata | 1814 | EN D NR Sc | Thalloidima rosulatum | ||
| 8216 | Thalloidima sedifolium | (Scop.) Kistenich, Timdal, Bendiksby & S. Ekman (2018) | Yes | Thalloidima sedifolium | Toninia caeruleonigricans auct.; Toninia sedifolia | 1416 | LC P Eng Wa | Thalloidima sedifolium | ||
| 8217 | Thalloidima squamatum | (Hoffm.) M. Westb. & Timdal (2023) | Yes | Thalloidima squamatum | 2874 | NE NR | Thalloidima squamatum | |||
| 8218 | Thalloidima tumidulum | (Sm.) Szatala (1932) | No | Porpidinia tumidula | 1429 | Ex | ||||
| 8219 | Thamnogalla crombiei | (Mudd) D. Hawksw. (1980) | Yes | Thamnogalla crombiei | 2245 | DD NR | LF | Thamnogalla crombiei | ||
| 8220 | Thamnolia subuliformis | (Ehrh.) W.L. Culb.(1963) | No | Thamnolia vermicularis | 1382 | LC |