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Arthonia susa R.C. Harris & Lendemer
Southeastern Comma
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: Forests and woodlands
Whitish thallus with obscure gray-pruinose or blackish lirellae; MICROSCOPY: spores colorless, muriform, enlarged at one end, about 24-36 x 10-14 µm; FIELD ID: with experience, lirellae are large & bold compared with most commas ("blot" commas are exceptions); requires dissection to confirm ID
Other Arthonia species have different spores & a Trentepohlia photobiont
None
Forests & woodlands; substrates: 29% oak bark, 22% maple & 49% other hardwoods
Corticolous crustose lichenized fungus, photobiont a chlorococcoid green alga
None
Statewide
Unknown
Uncommon
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. & D. Ladd. 2005. Preliminary draft: Ozark lichens. Unpublished manuscript, New York Botanical Garden, Bronx, NY.
Lendemer, J. C., R. C. Harris & E. A. Tripp. 2013. The lichens and allied fungi of Great Smoky Mountains National Park: an annotated checklist with comprehensive keys. Memoirs of the New York Botanical Garden 104: 1-152.
Malcolm Hodges
4 March 2022