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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 631 | Bacidia antricola | Hulting (1872) | No | Aquacida antricola | 139 | LC NS | ||||
| 632 | Bacidia arceutina | (Ach.) Arnold (1869) | Yes | Bacidia arceutina | Bacidia leightoniana | 131 | LC | Bacidia arceutina | ||
| 633 | Bacidia arceutina f. brevispora | Wheldon & Travis (1915) | No | ? Micarea lignaria | ||||||
| 634 | Bacidia arceutina f. deminuta | Th. Fr. | No | Bacidia arceutina | 131 | LC | ||||
| 635 | Bacidia arceutina var. hypnaea | (Nyl.) A.L. Sm. | No | Bacidia arceutina | 131 | LC | ||||
| 636 | Bacidia arnoldiana | auct. p.p. (corticolous specimens) | No | Bacidina modesta | 2502 | name or specific epithet valid but has been misused in the past | LC NS | |||
| 637 | Bacidia arnoldiana | Körb. (1860) | No | Bacidina arnoldiana | 132 | LC | ||||
| 638 | Bacidia arnoldiana f. corticola | Arnold (1862) | No | Bacidina modesta | 2502 | LC NS | ||||
| 639 | Bacidia ascaridiella | (Nyl.) A.L. Sm. (1911) | No | Spirographa fusisporella | 2218 | LC NS | LF | |||
| 640 | Bacidia assulata | auct. brit., non (Körb.) Vězda | Yes | Bacidia assulata | 133 | Not conspecific with Bacidina assulata | DD NR | Bacidia assulata | ||
| 641 | Bacidia atrogrisea | (Delise ex Hepp) Körb. | No | Bacidia laurocerasi | 155 | LC | ||||
| 642 | Bacidia atrosanguinea | auct. brit. | No | Toniniopsis separabilis | 168 | VU C, D1 NS P Eng Sc | ||||
| 643 | Bacidia atrosanguinea subsp. oribata | (Nyl.) A.L. Sm. (1911) | No | Toniniopsis coelestina | 1424 | VU D1, D2 NR Sc | ||||
| 644 | Bacidia auerswaldii | (Hepp ex Stizenb.) Mig. (1929) | No | Scutula effusa | Scutula effusa | 134 | DD NR | |||
| 645 | Bacidia bagliettoana | (A. Massal. & De Not.) Jatta (1900) | No | Toniniopsis bagliettoana | 158 | LC | ||||
| 646 | Bacidia beckhausii | auct. brit. p.p. | No | Micarea longispora | 894 | name or specific epithet valid but has been misused in the past | LC NS Sc IR | |||
| 647 | Bacidia beckhausii | Körb. (1860) | No | Biatora beckhausii | 135 | LC NS | ||||
| 648 | Bacidia biatorina | (Körb.) Vain. (1922) | Yes | Bacidia biatorina | Bacidia endoleuca | 136 | LC | Bacidia biatorina | ||
| 649 | Bacidia brandii | Coppins & van den Boom (2002) | No | Bacidina brandii | 2411 | LC NR | ||||
| 650 | Bacidia byssoboliza | (Nyl.) H. Olivier (1911) | No | Aquacidia antricola | 139 | LC NS | ||||
| 651 | Bacidia caesiovirens | S. Ekman & Holien (1995) | Yes | Bacidia caesiovirens | 1926 | In NW Britain, often confused with B. biatorina | LC NS Sc IR | Bacidia caesiovirens | ||
| 652 | Bacidia caligans | (Nyl.) A.L. Sm. (1911) | No | Bacidina caligans | 137 | LC NS | ||||
| 653 | Bacidia carneoalbens | (Nyl.) A.L. Sm. | No | Micarea cinerea f. cinerea | 875 | LC | ||||
| 654 | Bacidia carneoalbida | (Müll. Arg.) Coppins | No | Mycobilimbia carneoalbida | 1653 | CR D NR Sc | ||||
| 655 | Bacidia carneoglauca | (Nyl.) A.L. Sm. (1911) | No | Aquacidia antricola | 139 | LC NS | ||||
| 656 | Bacidia carneola | (Ach.) De Not. (1846) | No | Pachyphiale carneola | 972 | LC L | ||||
| 657 | Bacidia carneopallida | (Müll. Arg.) Coppins [orth. error] | No | Mycobilimbia carneoalbida | 1653 | CR D NR Sc | ||||
| 658 | Bacidia chlorococca | (Graewe ex Stenh.) Lettau (1912) | No | Scoliciosporum chlorococcum | 1320 | LC | ||||
| 659 | Bacidia chloroticula | (Nyl.) A.L. Sm. (1911) | No | Bacidina chloroticula | 140 | LC NS | ||||
| 660 | Bacidia cinerea | (Schaer.) Trevis. (1856) | No | Micarea cinerea f. cinerea | 875 | LC |