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 albohyalina | (Nyl.) Th. Fr. | No | incorrectly reported from the British Isles | ||||||
| 3842 | Lecidea albosuffusa | (Nyl.) Th. Fr. | No | Farnoldia jurana | 863 | LC NS | ||||
| 3843 | Lecidea alienata | Nyl. | No | Lecidella asema | 804 | LC | ||||
| 3844 | Lecidea alocizoides | auct. brit. p.p. | No | Rinodina bischoffii | 1283 | LC NS | ||||
| 3845 | Lecidea alocizoides | Leight. | No | Rinodina oleae | 1289 | |||||
| 3846 | Lecidea alpestris | auct. brit. p.p. | No | Micarea incrassata | 1631 | LC NS | ||||
| 3847 | Lecidea alpestris | auct. brit. p.p. | No | Protomicarea limosa | 742 | LC NS | ||||
| 3848 | Lecidea alpestris | Sommerf. (1825) | No | Protomicarea alpestris | 2391 | DD NR Sc | ||||
| 3849 | Lecidea alpestris var. brachyspora | I.M. Lamb | No | Protomicarea limosa | 742 | LC NS | ||||
| 3850 | Lecidea alumnula | Nyl. | No | Cecidonia xenophana | 1838 | LC NS | LF | |||
| 3851 | Lecidea amphiplecta | Stirt. | No | Lambiella furvella | 722 | LC | ||||
| 3852 | Lecidea amylacea | sensu Leight. (1858) | No | Psoronactis dilleniana | 596 | LC NS | ||||
| 3853 | Lecidea amylacea | (Ehrh. ex Pers.) Nyl. | No | Lecanographa amylacea | 594 | VU C2 NS P Eng Sc Wa IR | ||||
| 3854 | Lecidea aniptiza | Stirt. | No | Micarea denigrata | 877 | LC | ||||
| 3855 | Lecidea anomala | auct. brit. p.p. | No | Lecania cyrtella | 613 | LC | ||||
| 3856 | Lecidea anomaloides | A. Massal. | No | Lecidella anomaloides | 794 | LC NS | ||||
| 3857 | Lecidea anomaloides f. denigrans | Nyl. ex Cromb. | No | Gilbertaria contristans | 309 | LC NS | ||||
| 3858 | Lecidea antiloga | Stirt. | No | Lecidea globulispora | 695 | VU D2 NR Sc | ||||
| 3859 | Lecidea antrophila | Larbal. ex Leight. | No | Brianaria lutulata | 882 | LC | ||||
| 3860 | Lecidea aphana | Nyl. (1867) | No | Catillaria aphana | 696 | NT NR X Eng Sc | ||||
| 3861 | Lecidea aphanoides | Nyl. (1868) | No | Scoliciosporum intrusum | 878 | LC NR | ||||
| 3862 | Lecidea arceutina | (Ach.) Nyl. | No | Bacidia arceutina | 131 | LC | ||||
| 3863 | Lecidea arceutina f. deminuta | (Th. Fr.) Stirt. | No | Bacidia arceutina | 131 | LC | ||||
| 3864 | Lecidea arceutina var. hypnaea | Nyl. (1868) | No | Bacidia arceutina | 131 | LC | ||||
| 3865 | Lecidea arctica | Sommerf. | No | Frutidella caesioatra | 705 | LC NS | ||||
| 3866 | Lecidea arenicola | (Mudd) Leight. (1871) | No | Arthrorhaphis grisea | 313 | LC NS | LF | |||
| 3867 | Lecidea armeniaca | (DC.) Fr. | No | Calvitimela armeniaca | 697 | LC NR Sc | ||||
| 3868 | Lecidea aromatica | (Sm.) Turner (1808) | No | Toniniopsis aromatica | 1415 | LC | ||||
| 3869 | Lecidea arridens | Nyl. (1876) | No | Trapelia elacista | 2710 | ID tentative - type poor | NE | |||
| 3870 | Lecidea arthroocarpa | (Ach.) Ach. [orth. error] | No | Immersaria athroocarpa | 699 | LC NS |