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 | Aspicilia tuberculosa | (Ach.) J.R. Laundon (1986) | No | Circinaria tuberculosa | 1851 | Ex | ||||
| 602 | Aspicilia verrucigera | Hue | No | 128 | status of British material uncertain, BLS number no longer used | |||||
| 603 | Aspicilia verrucosa | (Ach.) Körb. | No | Megaspora verrucosa | 971 | NT NS | ||||
| 604 | Aspicilia zonata | (Ach.) R. Sant. (1984) | No | Sagedia zonata | 2625 | NE NR | ||||
| 605 | Aspicilia ‘silvatica’ | Arnold | No | Aspicilia laevata | 115 | LC NS | ||||
| 606 | Aspiciliella intermutans | (Nyl.) M. Choisy (1932) | Yes | Aspiciliella intermutans | Aspicilia intermutans | 114 | LC NS | Aspiciliella intermutans | ||
| 607 | Asteroglobulus giselae | Brackel (2010) | No | Spirographa giselae | 2750 | NE NR | LF | |||
| 608 | Athallia cerinella | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia cerinella | Caloplaca cerinella | 242 | LC | Athallia cerinella | ||
| 609 | Athallia cerinelloides | (Erichsen) Arup, Frödén & Søchting (2013) | Yes | Caloplaca cerinelloides | 279 | LC NS | Athallia cerinelloides | |||
| 610 | Athallia holocarpa s. lat. | Yes | Athallia holocarpa s. lat. | Caloplaca holocarpa s. lat. | 261 | LC | Athallia holocarpa s. lat. | |||
| 611 | 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 | Athallia holocarpa s. str. | ||
| 612 | Athallia pyracea | (Ach.) Arup, Frödén & Søchting (2013) | Yes | Athallia pyracea | Caloplaca holocarpa auct. p.p.; Caloplaca pyracea | 2528 | LC ?NS | Athallia pyracea | ||
| 613 | Athallia scopularis | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia scopularis | Caloplaca scopularis | 278 | NT NS | Athallia scopularis | ||
| 614 | Athallia vitellinula | (Nyl.) Arup, Frödén & Søchting (2013) | Yes | Athallia vitellinula | Caloplaca vitellinula | 2532 | NE NR | Athallia vitellinula | ||
| 615 | Athelia arachnoidea | (Berk.) Jülich (1972) | Yes | Athelia arachnoidea | Athelia epiphylla | 2015 | British records may refer to two or more species | LC | LF | Athelia arachnoidea |
| 616 | Athelia bispora | (J. Schröt.) Donk | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 617 | Athelia epiphylla | auct. lich. p.max.p. | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 618 | Athelia pyriformis | (M.P. Christ.) Jülich (1972) | No | Eonema pyriforme | 2725 | NE | LF | |||
| 619 | Atla alpina | Savić & Tibell (2008) | Yes | Atla alpina | Polyblastia theleodes auct. p.p. | 2494 | LC ?NS | Atla alpina | ||
| 620 | Atla wheldonii | (Travis) Savić & Tibell (2008) | Yes | Atla wheldonii | Polyblastia wheldonii | 1164 | NT NS E IR | Atla wheldonii | ||
| 621 | Aulacographa elegans | (Borrer ex Sm.) Leight. (1854) | No | Graphis elegans | 532 | LC | ||||
| 622 | 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 |
| 623 | Bachmanniomyces uncialicola | (Zopf) D. Hawksw. (1981) | No | Bachmanniomyces punctum | 2016 | LC NS | LF | |||
| 624 | Bachmanniomyces varius | (Coppins, Rambold & Triebel) Diederich & Pino Bodas (2018) | Yes | Bachmanniomyces varius | Phaeopyxis varia | 1964 | lichenicolous on Trapeliopsis gelatinosa | LC NR | LF | Bachmanniomyces varius |
| 625 | Bacidia abbrevians | (Nyl.) Th. Fr. (1874) | No | Scutula igniarii | 1828 | VU D1 NR Sc | ||||
| 626 | Bacidia absistens | (Nyl.) Arnold (1870) | Yes | Bacidia absistens | 129 | LC | Bacidia absistens | |||
| 627 | Bacidia accedens | (Arnold) Lettau | No | Bilimbia sabuletorum | 165 | LC | ||||
| 628 | Bacidia acerina | auct. brit. p.max.p. | No | Bacidia laurocerasi | 155 | LC | ||||
| 629 | Bacidia acerina | (Ach.) Arnold | No | Bacidia polychroa | 163 | Ex | ||||
| 630 | Bacidia adastra | Sparrius & Aptroot (2003) | No | Bacidina adastra | 2384 | LC NS |