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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 601 | Umbilicaria grisea | Hoffm. (1796) | Yes | Umbilicaria grisea | 1448 | Umbilicaria grisea | ||||
| 602 | Umbilicaria flocculosa | (Wulfen) Hoffm. | No | Umbilicaria deusta | 1447 | LC NS | ||||
| 603 | Umbilicaria erosa var. torrida | (Ach.) Nyl. | No | Umbilicaria torrefacta | 1455 | LC | ||||
| 604 | Umbilicaria erosa | (Weber) Hoffm. | No | Umbilicaria torrefacta | 1455 | LC | ||||
| 605 | Umbilicaria deusta | (L.) Baumg. (1790) | Yes | Umbilicaria deusta | 1447 | LC NS | Umbilicaria deusta | |||
| 606 | Umbilicaria decussata | (Vill.) Zahlbr. | No | incorrectly reported from the British Isles | ||||||
| 607 | Umbilicaria cylindrica var. tornata | (Ach.) Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 608 | Umbilicaria cylindrica var. laciniata | (Retz.) Zahlbr. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 609 | Umbilicaria cylindrica var. fimbriata | (Ach.) Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 610 | Umbilicaria cylindrica var. denudata | (Turner & Borrer) Frey | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 611 | Umbilicaria cylindrica var. delisei | Nyl. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 612 | Umbilicaria cylindrica f. exasperata | (Turner & Borrer) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 613 | Umbilicaria cylindrica f. denticulata | (Ach.) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 614 | 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 | ||
| 615 | Umbilicaria crustulosa | (Ach.) Lamy (1878) | Yes | Umbilicaria crustulosa | 1445 | VU D2 NR | Umbilicaria crustulosa | |||
| 616 | Umbilicaria coriacea | Imshaug | No | Umbilicaria rigida | Umbilicaria rigida (Du Rietz) Frey, incorrectly reported from the British Isles | |||||
| 617 | Umbilicaria atropruinosa | (Schaer.) Schaer. | No | Umbilicaria leiocarpa | Umbilicaria leiocarpa DC., incorrectly reported from the British Isles | |||||
| 618 | Umbilicaria arctica | (Ach.) Nyl. | No | 1444 | incorrectly reported from the British Isles, BLS number no longer used | |||||
| 619 | Tylothallia biformigera | (Leight.) P. James & H. Kilias (1981) | Yes | Tylothallia biformigera | Catillaria biformigera | 1440 | LC | Tylothallia biformigera | ||
| 620 | 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 | ||
| 621 | Tuckermanopsis chlorophylla | (Willd.) Hale [orth. error] | No | Tuckermannopsis chlorophylla | 327 | LC | ||||
| 622 | Tuckermannopsis chlorophylla | (Willd.) Hale (1987) | Yes | Tuckermannopsis chlorophylla | Cetraria chlorophylla; Nephromopsis chlorophylla; Tuckermanopsis chlorophylla | 327 | LC | Tuckermannopsis chlorophylla | ||
| 623 | Tubeufia heterodermiae | Etayo (2002) | No | Lichenotubeufia heterodermiae | 2603 | LF | ||||
| 624 | Trimmatothelopsis smaragdula | (Wahlenb.) Cl. Roux & Nav.-Ros. (2011) | No | Acarospora smaragdula | 25 | LC | ||||
| 625 | Trimmatothelopsis rhizobola | (Nyl.) K. Knudsen & Lendemer (2016) | Yes | Trimmatothelopsis rhizobola | Acarospora rhizobola, Lecidea rhizobola, Psora rhizobola | 767 | VU D2 NR Sc | Trimmatothelopsis rhizobola | ||
| 626 | Trimmatothelopsis benedarensis | (M. Knowles) K. Knudsen & Kocourk. (2021) | Yes | Trimmatothelopsis benedarensis | Acarospora benedarensis; Myriospora benedarenis | 7 | DD NR Sc | Trimmatothelopsis benedarensis | ||
| 627 | Trimmatothele perquisita | (Norman) Norman ex Zahlbr. (1903) | Yes | Trimmatothele perquisita | Verrucaria perquisita | 1439 | DD NR Sc | Trimmatothele perquisita | ||
| 628 | Trichothyrina cetrariicola | (Nyl.) D. Hawksw. | No | Lichenopeltella cetrariicola | 2098 | NE NR | LF | |||
| 629 | Trichothelium lineare | (Leight.) R.C. Harris | No | Porina linearis | 1182 | LC | ||||
| 630 | Trichothelium guentheri | (Flot.) R.C. Harris | No | Porina guentheri var. guentheri | 1174 | LC NS |