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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4951 | Lichen islandicus var. tenuissimus | L. | No | Cetraria aculeata | 430 | LC | ||||
| 4952 | Lichen jacquinii | J.F. Gmel. | No | ? Umbilicaria hyperborea or Umbilicaria proboscidea | ||||||
| 4953 | Lichen jubatus | auct. p.max.p. | No | Bryoria fuscescens | 192 | LC | ||||
| 4954 | Lichen lacerus | With. | No | Ramalina lacera | 1233 | LC | ||||
| 4955 | Lichen laciniatus | Huds. (1762) | No | Ricasolia amplissima | 855 | LC Sc L IR | ||||
| 4956 | Lichen lacteus | L. | No | Varicellaria lactea | 1077 | LC | ||||
| 4957 | Lichen lactucifolius | With. | No | Peltigera sp. | Peltigera sp., identity uncertain | |||||
| 4958 | Lichen lactucæfolius | With. [orth. var.] | No | Peltigera sp. | Peltigera sp., identity uncertain | |||||
| 4959 | Lichen lacustris | With. (1796) | No | Hymenelia lacustris | 573 | LC | ||||
| 4960 | Lichen laetevirens | Lightf. (1777) | No | Ricasolia virens | 856 | LC Sc L IR | ||||
| 4961 | Lichen laevigatus | Sm. | No | Hypotrachyna laevigata | 1002 | LC | ||||
| 4962 | Lichen lanatus | L. | No | Ephebe lanata | 509 | LC | ||||
| 4963 | Lichen leucomelos | L. | No | Heterodermia leucomelos | 558 | EN C2 NR P Eng Wa S8 IR | ||||
| 4964 | Lichen lightfootii | Sm. | No | Fuscidea lightfootii | 521 | LC | ||||
| 4965 | Lichen limbatus | Sm. | No | Sticta limbata | 1368 | LC Sc L IR | ||||
| 4966 | Lichen luridus | With. | No | Dermatocarpon luridum | 487 | LC | ||||
| 4967 | Lichen luridus | Sw., non With. | No | Romjularia lurida | 1202 | LC | ||||
| 4968 | Lichen luteoalbus | Turner (1804) | No | Cerothallia luteoalba | 266 | EN A2, C1 NS P Eng Sc Wa S8 | ||||
| 4969 | Lichen lutescens | Hoffm. | No | Pertusaria flavida | 1073 | LC | ||||
| 4970 | Lichen luteus | Dicks. (1785) | No | Coenogonium luteum | 490 | LC L* | ||||
| 4971 | Lichen lynceus | Sm. | No | Lecanographa lyncea | 600 | LC Sc IR | ||||
| 4972 | Lichen madreporiformis | With. (1776) | No | Pycnothelia papillaria | 1211 | LC | ||||
| 4973 | Lichen madreporæformis | With. (1776) [orth. var.] | No | Pycnothelia papillaria | 1211 | LC | ||||
| 4974 | Lichen marginalis | Huds. (1778) | No | Lathagrium cristatum var. marginale | 443 | LC ?NS | ||||
| 4975 | Lichen marginatus | Bernh. (1799) | No | Blennothallia crispa | 440 | LC | ||||
| 4976 | Lichen marmoreus | With. (1796), p.max.p, non Scop (1772) | No | Secoliga jenensis | 539 | LC | ||||
| 4977 | Lichen melaleucus | Sm. | No | Pertusaria pustulata | 1092 | VU B NR Eng | ||||
| 4978 | Lichen melanocarpus | Sw. | No | Bunodophoron melanocarpum | 1334 | LC | ||||
| 4979 | Lichen membranaceus | Dicks. | No | Lepraria membranacea | 1603 | LC | ||||
| 4980 | Lichen microcephalus | Sm. | No | Sphinctrina anglica | 1957 | DD NR | LF |