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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4201 | Lecidea melinodes | (Körb.) H. Magn. ex Lynge (1939) | No | Porpidia melinodes | 565 | LC NS | ||||
| 4202 | Lecidea melizea | Ach. (1810) | No | Coenogonium luteum | 490 | LC L* | ||||
| 4203 | Lecidea mersata | Stirt. | No | Porpidia hydrophila | 567 | LC | ||||
| 4204 | Lecidea mesotropa | Nyl. | No | Miriquidica leucophaea | 739 | LC | ||||
| 4205 | Lecidea mesotropiza | Nyl. | No | Lecanora formosa | 795 | NT NR Sc | ||||
| 4206 | Lecidea mesotropoides | Nyl. | No | Miriquidica leucophaea | 739 | LC | ||||
| 4207 | Lecidea metamorphea | Nyl. | No | Bilimbia sabuletorum | 165 | LC | ||||
| 4208 | Lecidea metamorphea subsp. septenaria | Nyl. | No | Bilimbia sabuletorum | 165 | LC | ||||
| 4209 | Lecidea metzleri | (Körb.) Th. Fr. | No | Clauzadea metzleri | 749 | LC NS | ||||
| 4210 | Lecidea micrococca | (Körb.) Cromb. | No | Micarea micrococca | 2359 | VU C, D1 NR P Eng Wa | ||||
| 4211 | Lecidea milliaria | Fr. | No | Micarea lignaria var. lignaria | 880 | LC | ||||
| 4212 | Lecidea milliaria var. saxigena | Leight., nom. nud. | No | Micarea lignaria var. lignaria | 880 | LC | ||||
| 4213 | Lecidea minuta | (Schaer.) A. Massal. non auct. brit. | No | Biatora globulosa | 310 | NT NS Sc | ||||
| 4214 | Lecidea minuta | auct. brit. p.p. | No | Lecania cyrtellina | 614 | LC | ||||
| 4215 | Lecidea minuta | auct. brit. p.p. | No | Lecidea erythrophaea | 720 | VU B NR P Eng Sc | ||||
| 4216 | Lecidea misella | (Nyl.) Nyl. (1866) | No | Micarea misella | 884 | LC NS | ||||
| 4217 | Lecidea modesta | Müll. Arg. | No | Catillaria modesta | 750 | VU D2 NR Sc | ||||
| 4218 | Lecidea modesta | auct. brit. p.p. | No | Brianaria lutulata | 882 | LC | ||||
| 4219 | Lecidea moestula | Nyl. (1868) | No | Leimonis erratica | 719 | LC | ||||
| 4220 | Lecidea mollis | (Wahlenb.) Nyl. | No | Fuscidea mollis | 523 | DD NR Sc | ||||
| 4221 | Lecidea monticola | Schaer. (1833) | No | Clauzadea monticola | 751 | LC | ||||
| 4222 | Lecidea mooreana | Carroll | No | Ainoa mooreana | 1433 | LC NS | ||||
| 4223 | Lecidea morio | auct. brit. | No | Sporostatia ?testudinea | ||||||
| 4224 | Lecidea mucosa | Stirt. (1879) | Yes | Lecidea mucosa | 1966 | DD NR E Sc IR | Lecidea mucosa | |||
| 4225 | Lecidea muddii | Salwey ex Mudd, nom. inval. | No | Halecania ralfsii | 620 | LC NS | ||||
| 4226 | Lecidea mullensis | Stirt. (1878) | No | Lambiella mullensis | 752 | LC NS E IR | ||||
| 4227 | Lecidea multifera | J.A. Martind. (1889) | No | Spirographa fusisporella | 2218 | LC NS | LF | |||
| 4228 | Lecidea muscorum | Ach. (1803) | No | Toniniopsis bagliettoana | 158 | LC | ||||
| 4229 | Lecidea mutabilis | auct. brit., non Fée | No | Japewiella tavaresiana | 708 | LC | ||||
| 4230 | Lecidea myriocarpa | (DC.) Röhl. | No | Amandinea punctata | 212 | LC |