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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 601 | Athallia cerinella | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia cerinella | Caloplaca cerinella | 242 | LC | |||
| 602 | Athallia cerinelloides | (Erichsen) Arup, Frödén & Søchting (2013) | Yes | Caloplaca cerinelloides | 279 | LC NS | ||||
| 603 | Athallia holocarpa s. lat. | Yes | Athallia holocarpa s. lat. | Caloplaca holocarpa s. lat. | 261 | LC | ||||
| 604 | Athallia holocarpa s. str. | (Hoffm.) Arup, Frödén & Søchting (2013) | Yes | Athallia holocarpa s. str. | Caloplaca holocarpa s. str.; Caloplaca pyracea auct. brit. p.max.p. (pre-2000) | 2527 | LC | |||
| 605 | Athallia pyracea | (Ach.) Arup, Frödén & Søchting (2013) | Yes | Athallia pyracea | Caloplaca holocarpa auct. p.p.; Caloplaca pyracea | 2528 | LC ?NS | |||
| 606 | Athallia scopularis | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia scopularis | Caloplaca scopularis | 278 | NT NS | |||
| 607 | Athallia vitellinula | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia vitellinula | Caloplaca vitellinula | 2532 | NE NR | |||
| 608 | Athelia arachnoidea | (Berk.) Jülich (1972) | Yes | Athelia arachnoidea | Athelia epiphylla | 2015 | British records may refer to two or more species | LC | LF | Athelia arachnoidea |
| 609 | Athelia bispora | (J. Schröt.) Donk | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 610 | Athelia epiphylla | auct. lich. p.max.p. | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 611 | Athelia pyriformis | (M.P. Christ.) Jülich (1972) | No | Eonema pyriforme | 2725 | NE | LF | |||
| 612 | Atla alpina | Savić & Tibell (2008) | Yes | Atla alpina | Polyblastia theleodes auct. p.p. | 2494 | LC ?NS | Atla alpina | ||
| 613 | Atla wheldonii | (Travis) Savić & Tibell (2008) | Yes | Atla wheldonii | Polyblastia wheldonii | 1164 | NT NS E IR | Atla wheldonii | ||
| 614 | Aulacographa elegans | (Borrer ex Sm.) Leight. (1854) | No | Graphis elegans | 532 | LC | ||||
| 615 | Bachmanniomyces punctum | (A. Massal.) Diederich & Pino Bodas (2018) | Yes | Bachmanniomyces punctum | Bachmanniomyces uncialicola (anamorph); Lecidea punctum; Phaeopyxis punctum | 2016 | lichenicolous on Cladonia spp. | LC NS | LF | Bachmanniomyces punctum |
| 616 | Bachmanniomyces uncialicola | (Zopf) D. Hawksw. (1981) | No | Bachmanniomyces punctum | 2016 | LC NS | LF | |||
| 617 | Bachmanniomyces varius | (Coppins, Rambold & Triebel) Diederich & Pino Bodas (2018) | Yes | Bachmanniomyces varius | Phaeopyxis varia | 1964 | lichenicolous on Trapeliopsis gelatinosa | LC NR | LF | Bachmanniomyces varius |
| 618 | Bacidia abbrevians | (Nyl.) Th. Fr. (1874) | No | Scutula igniarii | 1828 | VU D1 NR Sc | ||||
| 619 | Bacidia absistens | (Nyl.) Arnold (1870) | Yes | Bacidia absistens | 129 | LC | Bacidia absistens | |||
| 620 | Bacidia accedens | (Arnold) Lettau | No | Bilimbia sabuletorum | 165 | LC | ||||
| 621 | Bacidia acerina | auct. brit. p.max.p. | No | Bacidia laurocerasi | 155 | LC | ||||
| 622 | Bacidia acerina | (Ach.) Arnold | No | Bacidia polychroa | 163 | Ex | ||||
| 623 | Bacidia adastra | Sparrius & Aptroot (2003) | No | Bacidina adastra | 2384 | LC NS | ||||
| 624 | Bacidia affinis | (Stizenb.) Vain. (1922) | No | Toniniopsis separabilis | 168 | VU C, D1 NS P Eng Sc | ||||
| 625 | Bacidia albidocarnea | (Nyl.) Zahlbr. (1927) | No | Bacidia fuscoviridis | 148 | LC NS Sc | ||||
| 626 | Bacidia antricola | Hulting (1872) | No | Aquacida antricola | 139 | LC NS | ||||
| 627 | Bacidia arceutina | (Ach.) Arnold (1869) | Yes | Bacidia arceutina | Bacidia leightoniana | 131 | LC | Bacidia arceutina | ||
| 628 | Bacidia arceutina f. brevispora | Wheldon & Travis (1915) | No | ? Micarea lignaria | ||||||
| 629 | Bacidia arceutina f. deminuta | Th. Fr. | No | Bacidia arceutina | 131 | LC | ||||
| 630 | Bacidia arceutina var. hypnaea | (Nyl.) A.L. Sm. | No | Bacidia arceutina | 131 | LC |