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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3841 | Lecidea arceutina f. deminuta | (Th. Fr.) Stirt. | No | Bacidia arceutina | 131 | LC | ||||
| 3842 | Lecidea arceutina var. hypnaea | Nyl. (1868) | No | Bacidia arceutina | 131 | LC | ||||
| 3843 | Lecidea arctica | Sommerf. | No | Frutidella caesioatra | 705 | LC NS | ||||
| 3844 | Lecidea arenicola | (Mudd) Leight. (1871) | No | Arthrorhaphis grisea | 313 | LC NS | LF | |||
| 3845 | Lecidea armeniaca | (DC.) Fr. | No | Calvitimela armeniaca | 697 | LC NR Sc | ||||
| 3846 | Lecidea aromatica | (Sm.) Turner (1808) | No | Toniniopsis aromatica | 1415 | LC | ||||
| 3847 | Lecidea arridens | Nyl. (1876) | No | Trapelia elacista | 2710 | ID tentative - type poor | NE | |||
| 3848 | Lecidea arthroocarpa | (Ach.) Ach. [orth. error] | No | Immersaria athroocarpa | 699 | LC NS | ||||
| 3849 | Lecidea ascaridiella | Nyl. (1868) | No | Spirographa fusisporella | 2218 | LC NS | LF | |||
| 3850 | Lecidea asema | Nyl. | No | Lecidella asema | 804 | LC | ||||
| 3851 | Lecidea asperella | Stirt. | No | Carbonea vorticosa | 793 | LC NS | ||||
| 3852 | Lecidea asserculorum | auct. brit. | No | Micarea misella | 884 | LC NS | ||||
| 3853 | Lecidea assimilata | auct. brit. p.p. | No | Frutidella caesioatra | 705 | LC NS | ||||
| 3854 | Lecidea assimilata | auct. brit. p.p. | No | Bryobilimbia hypnorum | 730 | LC NS | ||||
| 3855 | Lecidea assimilata | Nyl. | No | Micarea assimilata | 698 | VU D2 NR Sc | ||||
| 3856 | Lecidea assimilata | auct. brit. p.p. | No | Micarea incrassata | 1631 | LC NS | ||||
| 3857 | Lecidea assimilata | auct. brit. p.p. | No | Protomicarea limosa | 742 | LC NS | ||||
| 3858 | Lecidea associata | Th. Fr. | No | Geltingia associata | 1943 | LC NS | LF | |||
| 3859 | Lecidea athrocarpa | (Ach.) Ach. [orth. error] | No | Immersaria athroocarpa | 699 | LC NS | ||||
| 3860 | Lecidea athroocarpa | (Ach.) Ach. (‘athrocarpa’) | No | Immersaria athroocarpa | 699 | LC NS | ||||
| 3861 | Lecidea atrata | (Ach.) Wahlenb. | No | Tremolecia atrata | 1438 | LC | ||||
| 3862 | Lecidea atroalba | auct. p.p. | No | Rhizocarpon hochstetteri | 1262 | LC | ||||
| 3863 | Lecidea atroalba | auct. p.p. | No | Rhizocarpon richardii | 1250 | LC | ||||
| 3864 | Lecidea atrobadia | Nyl. (1872) | No | Rhizocarpon polycarpum | 1270 | LC NS | ||||
| 3865 | Lecidea atrobrunnea subsp. saxosa | Hertel & Leuckert | No | Lecidea syncarpa | 1969 | DD NR | ||||
| 3866 | Lecidea atrocinerea | Hook. (1833) | No | Rinodina atrocinerea | 1281 | LC | ||||
| 3867 | Lecidea atrofulva | Sommerf. | No | Miriquidica atrofulva | 700 | LC NS | ||||
| 3868 | Lecidea atrogrisea | (Delise) Linds. (1872) | No | Bacidia laurocerasi | 155 | LC | ||||
| 3869 | Lecidea atroides | Walt. Watson | No | Tephromela atra var. atra | 630 | LC | ||||
| 3870 | Lecidea atropurpurascens | Nyl. (1873) | No | Catinaria atropurpurea | 183 | LC L* |