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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 511 | Usnea fulvoreagens | (Räsänen) Räsänen (1935) | Yes | Usnea fulvoreagens | 1465 | NE NR? | Usnea fulvoreagens | |||
| 512 | Usnea fragilescens var. mollis | (Vain.) P. Clerc (1987) | No | Usnea fragilescens | 1817 | LC | Usnea fragilescens var. mollis | |||
| 513 | Usnea fragilescens | Hav. ex Lynge (1921) | Yes | Usnea fragilescens | Usnea fragilescens var. mollis | 1817 | LC | Usnea fragilescens | ||
| 514 | Usnea foveolata | Vain. | No | incorrectly reported from the British Isles | ||||||
| 515 | Usnea foveata | Vain. | No | incorrectly reported from the British Isles | ||||||
| 516 | Usnea florida | (L.) F.H. Wigg. (1780) | Yes | Usnea florida | 1462 | NT ? P Eng Sc Wa | Usnea florida | |||
| 517 | Usnea flavocardia | Räsänen (1936) | Yes | Usnea flavocardia | Usnea wirthii | 1731 | DD NR Sc | Usnea flavocardia | ||
| 518 | Usnea flammea | Stirt. (1881) | Yes | Usnea flammea | 1461 | LC | Usnea flammea | |||
| 519 | Usnea filipendula | Stirt. | No | Usnea dasopoga | 1460 | LC | ||||
| 520 | Usnea fibrillosa | Motyka | No | Usnea dasopoga | 1460 | LC | ||||
| 521 | Usnea extensa | Vain. | No | Usnea glabrescens | 1467 | LC NS | ||||
| 522 | Usnea esperantiana | P. Clerc (1992) | Yes | Usnea esperantiana | Usnea fulvoreagens auct. p.p. | 1816 | NT NR Sc IR | Usnea esperantiana | ||
| 523 | Usnea distincta | auct. brit., non Motyka | No | Usnea subfloridana | 1471 | LC | ||||
| 524 | Usnea diplotypa | Vain. | No | incorrectly reported from the British Isles | ||||||
| 525 | Usnea dasypoga | (Ach.) Nyl. (1876) [orth. error] | No | Usnea dasopoga | 1460 | LC | ||||
| 526 | Usnea dasopoga | (Ach.) Nyl. (1876) | Yes | Usnea dasopoga | Usnea chaetophora; Usnea dasypoga; Usnea filipendula | 1460 | LC | Usnea dasopoga | ||
| 527 | Usnea dasaea | Stirt. (1881) | No | Usnea cornuta s. lat. | 1469 | LC | ||||
| 528 | Usnea cornuta s. str. | Körb. (1865) | Yes | Usnea cornuta s. str. | 2855 | NE | ||||
| 529 | Usnea cornuta s. lat. | Yes | Usnea cornuta s. lat. | Usnea ceratina var. incurvescens; Usnea inflata; Usnea intexta; Usnea intexta var. constrictula | 1469 | LC | Usnea cornuta s. lat. | |||
| 530 | Usnea constrictula | Stirt. (1881) | No | Usnea cornuta s. lat. | 1469 | LC | ||||
| 531 | Usnea compacta | auct. brit., non (Räsänen) Motyka | No | Usnea subfloridana | 1471 | LC | ||||
| 532 | Usnea comosa var. sordidula | (Motyka) H. Magn. | No | Usnea subfloridana | 1471 | LC | ||||
| 533 | Usnea comosa var. similis | (Motyka) Erichsen | No | Usnea subfloridana | 1471 | LC | ||||
| 534 | Usnea comosa | (Ach.) Vain. | No | Usnea subfloridana | 1471 | LC | ||||
| 535 | Usnea chaetophora | auct. p.p. | No | Usnea barbata | 2741 | NE NR | ||||
| 536 | Usnea chaetophora | Stirt. (1883) | No | Usnea dasopoga | 1460 | No longer in use, the BLS code number 1459 was used for this name | LC | |||
| 537 | Usnea ceratina var. scabrosa | sensu Cromb., ? non Ach. | No | Usnea flammea | 1461 | LC | ||||
| 538 | Usnea ceratina var. incurvescens | (Arnold) H. Olivier, non auct. brit. p.p. | No | Usnea ceratina | 1458 | LC Sc | ||||
| 539 | Usnea ceratina var. incurvescens | auct. brit. p.p., non (Arnold) H. Olivier | No | Usnea cornuta s. lat. | 1469 | LC | ||||
| 540 | Usnea ceratina | Ach. (1810) | Yes | Usnea ceratina | 1458 | LC Sc | Usnea ceratina |