Sulphur Dust Lichen
- Peak month
- May
- Records since 2000
- 3,041
- Scientific name
- Psilolechia lucida
Yellow Map Lichen
- Peak month
- May
- Records since 2000
- 3,025
- Scientific name
- Rhizocarpon geographicum
Parelle
- Peak month
- July
- Records since 2000
- 2,976
- Scientific name
- Ochrolechia parella
Bitter fluff-wart
- Peak month
- May
- Records since 2000
- 2,956
- Scientific name
- Lepra amara
Darkened Button Lichen
- Peak month
- June
- Records since 2000
- 2,926
- Scientific name
- Buellia aethalea
Cartilage lichen
- Peak month
- March
- Records since 2000
- 2,916
- Scientific name
- Ramalina fastigiata
Pustulate revolute loop lichen
- Peak month
- April
- Records since 2000
- 2,902
- Scientific name
- Hypotrachyna afrorevoluta
Nit Beard Lichen
- Peak month
- May
- Records since 2000
- 2,839
- Scientific name
- Usnea subfloridana
Pertusaria pertusa
- Peak month
- May
- Records since 2000
- 2,835
- Group
- Lichens
Common Script Lichen
- Peak month
- March
- Records since 2000
- 2,809
- Scientific name
- Graphis scripta
Powder-headed Tube Lichen
- Peak month
- May
- Records since 2000
- 2,663
- Scientific name
- Hypogymnia tubulosa
Peltigera hymenina
- Peak month
- May
- Records since 2000
- 2,640
- Group
- Lichens
Membraneous felt lichen
- Peak month
- May
- Records since 2000
- 2,536
- Scientific name
- Peltigera membranacea
Many-forked Cladonia
- Peak month
- September
- Records since 2000
- 2,510
- Scientific name
- Cladonia furcata
Powdery Saucer Lichen
- Peak month
- May
- Records since 2000
- 2,443
- Scientific name
- Ochrolechia androgyna
Hoary Rosette Lichen
- Peak month
- April
- Records since 2000
- 2,424
- Scientific name
- Physcia aipolia
Pebbled Pixie-cup
- Peak month
- May
- Records since 2000
- 2,374
- Scientific name
- Cladonia pyxidata
Calcareous rimmed lichen
- Peak month
- June
- Records since 2000
- 2,373
- Scientific name
- Circinaria calcarea
Fuscidea lightfootii
- Peak month
- May
- Records since 2000
- 2,354
- Group
- Lichens
Lecanora conizaeoides
- Peak month
- June
- Records since 2000
- 2,340
- Group
- Lichens
Poeltonia grisea
- Peak month
- June
- Records since 2000
- 2,248
- Group
- Lichens
Spotted felt lichen
- Peak month
- May
- Records since 2000
- 2,203
- Scientific name
- Sticta sylvatica
Grayish Button Lichen
- Peak month
- August
- Records since 2000
- 2,173
- Scientific name
- Diplotomma alboatrum
Griffith's cliostomum lichen
- Peak month
- May
- Records since 2000
- 2,167
- Scientific name
- Cliostomum griffithii
Polycauliona ucrainica
- Peak month
- July
- Records since 2000
- 2,146
- Group
- Lichens
Powdered Trumpet Lichen
- Peak month
- September
- Records since 2000
- 2,107
- Scientific name
- Cladonia fimbriata
Pore lichen
- Peak month
- May
- Records since 2000
- 2,100
- Scientific name
- Pertusaria hymenea
Scoliciosporum lichen
- Peak month
- July
- Records since 2000
- 2,097
- Scientific name
- Scoliciosporum umbrinum
Toniniopsis aromatica
- Peak month
- July
- Records since 2000
- 2,088
- Group
- Lichens
Chiseled Sunken Disk Lichen
- Peak month
- June
- Records since 2000
- 2,040
- Scientific name
- Circinaria contorta
Pore lichen
- Peak month
- May
- Records since 2000
- 2,031
- Scientific name
- Lepra albescens
Thorn cladonia
- Peak month
- August
- Records since 2000
- 2,030
- Scientific name
- Cladonia uncialis
Arthonia atra
- Peak month
- May
- Records since 2000
- 2,017
- Group
- Lichens
Dragon Horn
- Peak month
- May
- Records since 2000
- 1,984
- Scientific name
- Cladonia squamosa
Globe Ball Lichen
- Peak month
- May
- Records since 2000
- 1,930
- Scientific name
- Sphaerophorus globosus
Stiff Tar-spot Lichen
- Peak month
- June
- Records since 2000
- 1,911
- Scientific name
- Placynthiella icmalea
Candelariella reflexa
- Peak month
- April
- Records since 2000
- 1,902
- Group
- Lichens
Flaming Cowgirls
- Peak month
- June
- Records since 2000
- 1,891
- Scientific name
- Calogaya saxicola
Cresponea premnea
- Peak month
- December
- Records since 2000
- 1,875
- Also known as
- a Lichen
Pertusaria leioplaca
- Peak month
- May
- Records since 2000
- 1,872
- Group
- Lichens
Rinodina oleae
- Peak month
- August
- Records since 2000
- 1,868
- Group
- Lichens
Ricasolia virens
- Peak month
- March
- Records since 2000
- 1,854
- Also known as
- Green Satin lichen
Brown-beret Lichen
- Peak month
- May
- Records since 2000
- 1,850
- Scientific name
- Baeomyces rufus
Catillaria lichen
- Peak month
- July
- Records since 2000
- 1,811
- Scientific name
- Catillaria chalybeia
Cladonia polydactyla
- Peak month
- May
- Records since 2000
- 1,794
- Group
- Lichens
Xanthoria calcicola
- Peak month
- June
- Records since 2000
- 1,794
- Group
- Lichens
Fused Rim-lichen
- Peak month
- June
- Records since 2000
- 1,779
- Scientific name
- Lecanora symmicta
Myriolecis crenulata
- Peak month
- July
- Records since 2000
- 1,745
- Group
- Lichens