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Thelotrema subtile Tuck.
Common Bark-barnacles
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: GNR
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: Mesic hardwood forests, swamps
Pale whitish thallus thin, mostly without a cortex; apothecia up to 0.5 mm in diameter (though usually many are smaller), disks gray, dusted with pruina, immersed in pores, exciple usually free & visible as a thin, irregular membrane within each pore; MICROSCOPY: spores colorless, transversely septate; FIELD ID: best examined in lab where disks can be measured
Thelotrema lathraeum is corticate & all its pores are tiny, 0.2-0.35 mm across; differences in Thelotrema thalli can vary & differ subtly, with dissection to observe spores the best way to sort them
None
Mesic hardwood forests, swamps; substrates: hardwood bark: 28% Liriodendron, 14% Acer, 9% Nyssa, 9% Quercus, 7% Fraxinus, 5% Ilex & 26% other hardwoods or unknowns; 1 record from Taxodium bark
Corticolous crustose lichenized fungus, photobiont an alga in Trentepohlia
None
Statewide
Unknown
Common
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.
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.
Harris, R. C. 1995. More Florida lichens including the 10-cent tour of the pyrenolichens. Unpublished manuscript, Bronx, N.Y.
Malcolm Hodges
1 August 2022
