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 | Umbilicaria varia var. polyphylla f. congregata | (Turner & Borrer) Leight. | No | Umbilicaria polyphylla | 1451 | LC | ||||
| 8492 | Umbilicaria varia var. polyphylla f. lacera | Leight. | No | Umbilicaria polyphylla | 1451 | LC | ||||
| 8493 | Umbilicaria varia var. polyphylla f. monophylla | Leight. | No | Umbilicaria polyphylla | 1451 | LC | ||||
| 8494 | Umbilicaria varia var. polyphylla f. sulcata | (Turner & Borrer) Leight. | No | Umbilicaria polyphylla | 1451 | LC | ||||
| 8495 | Umbilicaria varia var. proboscidea | sensu Leight., non (L.) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8496 | Umbilicaria varia var. proboscidea f. denudata | (Turner & Borrer) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8497 | Umbilicaria varia var. proboscidea f. exasperata | (Turner & Borrer) Leight. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 8498 | Umbilicaria vellea | (L.) Hoffm. | No | incorrectly reported from the British Isles | ||||||
| 8499 | Umbilicaria virginis | Schaer. | No | incorrectly reported from the British Isles | ||||||
| 8500 | Unguiculariopsis groenlandiae | (Alstrup & D. Hawksw.) Etayo & Diederich (2000) | No | Llimoniella groenlandiae | 2105 | NE NR | LF | |||
| 8501 | Unguiculariopsis lesdainii | (Vouaux) Etayo & Diederich (2000) | Yes | Unguiculariopsis lesdainii | 2303 | NE NR | LF | Unguiculariopsis lesdainii | ||
| 8502 | Unguiculariopsis lettaui | (Grummann) Coppins (1990) | Yes | Unguiculariopsis lettaui | Skyttea lettaui | 2258 | LC NS | LF | Unguiculariopsis lettaui | |
| 8503 | Unguiculariopsis manriquei | Etayo (1996) | Yes | Unguiculariopsis manriquei | 1997 | NE NR | LF | Unguiculariopsis manriquei | ||
| 8504 | Unguiculariopsis refractiva | (Coppins) Coppins (1990) | Yes | Unguiculariopsis refractiva | Skyttea refractiva | 2259 | NE NR | LF | Unguiculariopsis refractiva | |
| 8505 | Unguiculariopsis thallophila | (P. Karst.) W.Y. Zhuang (1988) | Yes | Unguiculariopsis thallophila | Scutula cristata Skyttea thallophila |
2260 | LC NS | LF | Unguiculariopsis thallophila | |
| 8506 | Urceolaria acharii | (Ach.) Ach. (1803) | No | Hymenelia lacustris | 573 | LC | ||||
| 8507 | Urceolaria cyrtaspis | auct. | No | Hymenelia lacustris | 573 | LC | ||||
| 8508 | Urceolaria scruposa | (Schreb.) Ach. | No | Diploschistes scruposus | 495 | LC | ||||
| 8509 | Usnea arianae | P. Clerc, E. Caviró & A. Gerlach (2020) | Yes | Usnea arianae | 2854 | a member of Usnea cornuta group | NE NR | Usnea arianae | ||
| 8510 | Usnea articulata | (L.) Hoffm. (1796) | Yes | Usnea articulata | 1456 | NT P Eng Wa IR | Usnea articulata | |||
| 8511 | Usnea articulata subsp. intestiniformis | (Ach.) Motyka | No | Usnea articulata | 1456 | NT P Eng Wa IR | ||||
| 8512 | Usnea articulata subsp. mediterranea | Motyka | No | Usnea articulata | 1456 | NT P Eng Wa IR | ||||
| 8513 | Usnea barbata | (L.) F.H. Wigg (1780) | Yes | Usnea barbata | 2741 | NE NR | Usnea barbata | |||
| 8514 | Usnea barbata | auct. brit. p.max.p. | No | Usnea dasopoga | 1460 | LC | ||||
| 8515 | Usnea barbata var. articulata | (L.) Ach. | No | Usnea articulata | 1456 | NT P Eng Wa IR | ||||
| 8516 | Usnea barbata var. florida | (L.) Fr. | No | Usnea florida | 1462 | Pre c. 1960 usage probably includes other species, esp. U. subfloridana | NT ? P Eng Sc Wa | |||
| 8517 | Usnea barbata var. plicata | auct. brit. p.p. | No | Usnea ceratina | 1458 | LC Sc | ||||
| 8518 | Usnea cavernosa | Tuck. | No | 1457 | incorrectly reported from the British Isles, BLS number no longer used | |||||
| 8519 | Usnea ceratina | Ach. (1810) | Yes | Usnea ceratina | 1458 | LC Sc | Usnea ceratina | |||
| 8520 | Usnea ceratina var. incurvescens | (Arnold) H. Olivier, non auct. brit. p.p. | No | Usnea ceratina | 1458 | LC Sc |