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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: Maritime forest, pine flatwoods, swamp forest

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Description

Pale, whitish to gray thallus with variable dark to black ascomata; MICROSCOPY: spores colorless, 4-celled with end cell enlarged, about 12.5-15 x 5 µm; FIELD ID: the other comma on palm petioles, often growing with A. rubrocincta & ignored due to showiness of the other species; dissection not necessary with experience

Similar Species

None; beware dead thalli of A. rubrocincta

Related Rare Species

None

Habitat

Coastal forest & woodland communities; only known from Sabal palmetto woody petioles (at least in Ga.)

Life History

Foliicolous (corticolous?) crustose lichenized fungus, photobiont an alga in Trentepohlia

Survey Recommendations

None

Range

Lower Coastal Plain, or anywhere sabal palmetto is planted

Threats

Harvesting palms from natural habitats for landscaping

Georgia Conservation Status

Probably at least as common as Arthonia rubrocincta, though often ignored or overlooked

Conservation Management Recommendations

None

References

Brodo, I. M. 2001. Lichens of North America. 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.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

4 March 2022