| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LAHE | Layia heterotricha (DC.) Hook. & Arn. | paleyellow tidytips | Asteraceae
|
| LAHI3 | Layia hieracioides (DC.) Hook. & Arn. | tall tidytips | Asteraceae
|
| LAJO | Layia jonesii Gray | Jones' tidytips | Asteraceae
|
| LALE3 | Layia leucopappa Keck | Comanche Point tidytips | Asteraceae
|
| LAMU2 | Layia munzii Keck | Munz's tidytips | Asteraceae
|
| LAPA6 | Layia paniculata Keck | Layia hieracioides | Asteraceae
|
| LAPEA | Layia pentachaeta Gray ssp. albida Keck | Sierra tidytips | Asteraceae
|
| LAPEP | Layia pentachaeta Gray ssp. pentachaeta | Sierra tidytips | Asteraceae
|
| LAPE | Layia pentachaeta Gray | Sierra tidytips | Asteraceae
|
| LAPLC | Layia platyglossa (Fisch. & C.A. Mey.) Gray ssp. campestris Keck | Layia platyglossa | Asteraceae
|
| LAPLB | Layia platyglossa (Fisch. & C.A. Mey.) Gray var. breviseta Gray | Layia platyglossa | Asteraceae
|
| LAPL | Layia platyglossa (Fisch. & C.A. Mey.) Gray | coastal tidytips | Asteraceae
|
| LASE2 | Layia septentrionalis Keck | Colusa tidytips | Asteraceae
|
| LAZI2 | Layia ziegleri Munz | Layia platyglossa | Asteraceae
|
| LAYIA | Layia Hook. & Arn. ex DC. | tidytips | Asteraceae
|
| LEKR | Leandra krugiana (Cogn.) Judd & Skean | Krug's roughleaf | Melastomataceae
|
| LEKR2 | Leandra krugii (Cogn.) Judd & Skean | Mt. Cerrote angleflower | Melastomataceae
|
| LEAND | Leandra Raddi | leandra | Melastomataceae
|
| LEALA | Leavenworthia alabamica Rollins var. alabamica | Alabama gladecress | Brassicaceae
|
| LEALB | Leavenworthia alabamica Rollins var. brachystyla Rollins | Alabama gladecress | Brassicaceae
|
| LEAL2 | Leavenworthia alabamica Rollins | Alabama gladecress | Brassicaceae
|
| LEAUA2 | Leavenworthia aurea Torr. var. aurea | golden gladecress | Brassicaceae
|
| LEAUT | Leavenworthia aurea Torr. var. texana (Mahler) Rollins | golden gladecress | Brassicaceae
|
| LEAU | Leavenworthia aurea Torr. | golden gladecress | Brassicaceae
|
| LECRC | Leavenworthia crassa Rollins var. crassa | fleshyfruit gladecress | Brassicaceae
|
| LECRE | Leavenworthia crassa Rollins var. elongata Rollins | fleshyfruit gladecress | Brassicaceae
|
| LECR | Leavenworthia crassa Rollins | fleshyfruit gladecress | Brassicaceae
|
| LEEXE | Leavenworthia exigua Rollins var. exigua | Tennessee gladecress | Brassicaceae
|
| LEEXL | Leavenworthia exigua Rollins var. laciniata Rollins | Tennessee gladecress | Brassicaceae
|
| LEEXL2 | Leavenworthia exigua Rollins var. lutea Rollins | Tennessee gladecress | Brassicaceae
|
| LEEX | Leavenworthia exigua Rollins | Tennessee gladecress | Brassicaceae
|
| LEMI7 | Leavenworthia michauxii Torr. | Leavenworthia uniflora | Brassicaceae
|
| LEST7 | Leavenworthia stylosa Gray | cedar gladecress | Brassicaceae
|
| LETE6 | Leavenworthia texana Mahler | Leavenworthia aurea var. texana | Brassicaceae
|
| LETO | Leavenworthia torulosa Gray | necklace gladecress | Brassicaceae
|
| LEUN | Leavenworthia uniflora (Michx.) Britt. | Michaux's gladecress | Brassicaceae
|
| LEAVE | Leavenworthia Torr. | gladecress | Brassicaceae
|
| LEPA15 | Lebretonia paniculata (Cav.) Britt. | Pavonia paniculata | Malvaceae
|
| LEAB | Lecanactis abietina (Ach.) Korber | old wood rimmed lichen | Opegraphaceae
|
| LEAK | Lecanactis akompsa (Tuck.) | old wood rimmed lichen | Opegraphaceae
|
| LEAM3 | Lecanactis amylacea (Pers. ex Ach.) Arnold | Lecanographa amylacea | Uncertain Lichen Family
|
| LECA36 | Lecanactis californica Tuck. | Sigridea californica | Roccellaceae
|
| LECH5 | Lecanactis chloroconia Tuck. | Cresponea chloroconia | Opegraphaceae
|
| LEDU2 | Lecanactis dubia G. Merr. | old wood rimmed lichen | Opegraphaceae
|
| LEGR8 | Lecanactis grumulosa (Dufour) Fr. | Lecanographa grumulosa | Uncertain Lichen Family
|
| LEIL | Lecanactis illicebrosa (Dufour) Fr. | Lecanographa amylacea | Uncertain Lichen Family
|
| LEME6 | Lecanactis megaspora (G. Merr.) Brodo | Lecanactis abietina | Opegraphaceae
|
| LENA7 | Lecanactis nashii Egea & Torrente | Lecanographa hypothallina | Uncertain Lichen Family
|
| LEPA27 | Lecanactis patellarioides (Nyl.) Vainio | Bactrospora patellarioides | Opegraphaceae
|
| LEPR7 | Lecanactis premnea (Ach.) Arnold | Cresponea premnea | Opegraphaceae
|
| LERA14 | Lecanactis ravenelii (Tuck.) R. C. Harris | Opegrapha ravenelii | Opegraphaceae
|
| LESA5 | Lecanactis salicina Zahlbr. | old wood rimmed lichen | Opegraphaceae
|
| LESU38 | Lecanactis subattigens (Nyl.) R. C. Harris | old wood rimmed lichen | Opegraphaceae
|
| LESU40 | Lecanactis subdryophila Follmann & Vezda | Lecanographa subdryophila | Uncertain Lichen Family
|
| LEZA | Lecanactis zahlbruckneri Herre | Sigridea californica | Roccellaceae
|
| LECAN2 | Lecanactis Korber | old wood rimmed lichen | Opegraphaceae
|
| LEAL21 | Lecania albariella (Nyl.) Mull. Arg. | Lecania turicensis | Bacidiaceae
|
| LEAL22 | Lecania alpivaga Th. Fr. | Halecania alpivaga | Catillariaceae
|
| LEAR17 | Lecania arctica Lynge | Caloplaca diphyodes | Teloschistaceae
|
| LEBR3 | Lecania brunonis (Tuck.) Herre | | Bacidiaceae
|
| LECA19 | Lecania californica (Zahlbr.) Fink | | Bacidiaceae
|
| LECO38 | Lecania constricta W. A. Weber | | Bacidiaceae
|
| LECU9 | Lecania cuprea (A. Massal.) v. d. Boom & Coppins | | Bacidiaceae
|
| LECU8 | Lecania curvescens (Mudd) A. L. Sm. | Bryonora curvescens | Lecanoraceae
|
| LECY13 | Lecania cyathiformis Szatala | | Bacidiaceae
|
| LECY6 | Lecania cyrtella (Ach.) Th. Fr. | | Bacidiaceae
|
| LECY7 | Lecania cyrtellina (Nyl.) Sandst. | Lecania cyrtella | Bacidiaceae
|
| LEDI16 | Lecania dimera (Nyl.) Th. Fr. | Lecania dubitans | Bacidiaceae
|
| LEDI25 | Lecania discreptans (Nyl.) Lynge | | Bacidiaceae
|
| LEDU3 | Lecania dubitans (Nyl.) A. L. Sm. | | Bacidiaceae
|
| LEDU5 | Lecania dudleyi Herre | | Bacidiaceae
|
| LEER3 | Lecania erysibe (Ach.) Mudd | | Bacidiaceae
|
| LEFL20 | Lecania flavescens Lynge | | Bacidiaceae
|
| LEFR6 | Lecania fructigena Zahlbr. | | Bacidiaceae
|
| LEFU2 | Lecania fuscella (Schaerer) Korber | | Bacidiaceae
|
| LEGR9 | Lecania groenlandica (Lynge) | | Bacidiaceae
|
| LEHA6 | Lecania hassei (Zahlbr.) W. Noble | | Bacidiaceae
|
| LENA6 | Lecania naegelii (Hepp) Diederich & v. d. Boom | | Bacidiaceae
|
| LENY | Lecania nylanderiana A. Massal. | | Bacidiaceae
|
| LEPE8 | Lecania pepegospora H. Magn. | | Bacidiaceae
|
| LEPE9 | Lecania perproxima (Nyl.) Zahlbr. | | Bacidiaceae
|
| LESH3 | Lecania shastensis Herre | | Bacidiaceae
|
| LEST21 | Lecania stigmatella (Tuck.) S. Ekman | | Bacidiaceae
|
| LESU4 | Lecania subcaesia (Nyl.) de Lesd. | | Bacidiaceae
|
| LESU5 | Lecania subdispersa (Nyl.) Hasse | | Bacidiaceae
|
| LESU45 | Lecania subfuscula (Nyl.) S. Ekman | | Bacidiaceae
|
| LESY2 | Lecania syringea (Ach.) Th. Fr. | Lecania fuscella | Bacidiaceae
|
| LETE26 | Lecania tenera (Nyl.) Clauzade & Roux | Lecanora tenera | Lecanoraceae
|
| LETH10 | Lecania thallophila H. Magn. | Halecania alpivaga | Catillariaceae
|
| LETO5 | Lecania toninioides Zahlbr. | | Bacidiaceae
|
| LETU3 | Lecania turicensis (Hepp) Mull. Arg. | | Bacidiaceae
|
| LECAN3 | Lecania A. Massal. | lecania | Bacidiaceae
|
| LEME5 | Lecanium membranaceum (L.) K. Presl | Trichomanes membranaceum | Hymenophyllaceae
|
| LEAM10 | Lecanographa amylacea (Ehrh. ex Pers.) Egea & Torrente | | Uncertain Lichen Family
|
| LEDI26 | Lecanographa dimelaenoides (Egea & Torrente) Egea & Torrente | | Uncertain Lichen Family
|
| LEGR22 | Lecanographa grumulosa (Dufour) Egea & Torrente | | Uncertain Lichen Family
|
| LEHY12 | Lecanographa hypothallina (Zahlbr.) Egea & Torrente | | Uncertain Lichen Family
|
| LESU39 | Lecanographa subdryophila (Follmann & Vezda) Egea & Torrente | | Uncertain Lichen Family
|
| LECAN5 | Lecanographa Egea & Torrente | lecanographa | Uncertain Lichen Family
|
| LEAC5 | Lecanora acroides Vainio | rim lichen | Lecanoraceae
|
| LEAC6 | Lecanora actophila Wedd. | rim lichen | Lecanoraceae
|