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Lecanora chlarotera Nyl.
Dusted White-rim
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: G5
State Rank: SNR
Element Locations Tracked in Biotics: No
SWAP 2015 Species of Greatest Conservation Need (SGCN): No
SWAP 2025 Species of Greatest Conservation Need (SGCN): No
2025 SGCN Priority Tier: None
Element Occurrences (EOs) in Georgia: 0
Habitat Summary for element in Georgia: Sandhill woodlands, mixed forests
Pale green thallus continuous to rimose, smooth to verruculose; apothecia abundant, less than 0.75 mm in diameter (occasionally to 1 mm); noticeably white, puffy, smooth rim, especially white when young, less noticeably so when old & often growing bumpy or beaded; surface of disk golden-tan to dark brown, lightly dusted with fine pruina (difficult to see without magnification); MICROSCOPY: upper hymenium clear, not inspersed with fine crystals, amphithecium with large crystals, spores simple, hyaline, ellipsoid, 10-12.5 µm long; CHEMISTRY: thallus K+ yellow; FIELD ID: possible with experience, especially in very white-rimmed individuals, but best confirmed with dissection
Lecanora rugosella usually has larger disks & spores & a rougher thallus; L. imshaugii has brown disks with strongly contrasting white rims, but the rim surfaces are often fuzzy, not smooth, & the disk surfaces lack a pruina
None
Sandhill woodlands, montane forests, on hardwood bark, mostly Quercus
Corticolous crustose lichenized fungus, photobiont a unicellular green alga (Pseudotrebouxia)
None
Mostly Coastal Plain, occasional in Piedmont & Southern Blue Ridge
Unknown
Uncommon (though common to abundant in some habitats, especially Coastal Plain sandhills on scrub oaks); Brodo (2020) indicates there are likely multiple species in L. chlarotera
None
Brodo, I. M. 2001. Lichens of North America. Yale University Press, New Haven, Conn.
Brodo, I. M. 2016. Keys to lichens of North America: revised and expanded. Yale University Press, New Haven, Conn.
Brodo, I. M. 2020. Personal communication regarding specimens from Coastal Plain sandhills.
Esslinger, T. L. 2021. A cumulative checklist for the lichen-forming, lichenicolous and allied fungi of the continental United States and Canada. Version 24. Opuscula Philolichenum 20: 100-394.
Malcolm Hodges
17 April 2022