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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: Hardwood forests, mixed forests

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Description

Whitish, tan or gray thallus with small pale-to-dark reddish-brown (to gray-brown) lirellae, branches of lirellae narrow; MICROSCOPY: spores colorless, 5-6-celled with end cell enlarged, 32-37 x 12-16 µm; FIELD ID: confusion with other brown-fruited commas means dissection is required to observe spores

Similar Species

Arthonia anglica has fewer celled & smaller spores, & generally broader, darker lirellae; A. pyrrhuliza has similar lirellae, but 3-4-celled spores that become brown in maturity

Related Rare Species

None

Habitat

Hardwood forests, mixed forests; 25% Carya spp. bark, 74% other hardwoods; 1 record on Juniperus virginiana bark

Life History

Corticolous crustose lichenized fungus, photobiont an alga in Trentepohlia

Survey Recommendations

None

Range

Statewide

Threats

Unknown

Georgia Conservation Status

Common, in some places abundant

Conservation Management Recommendations

None

References

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 Unpublished manuscript, New York Botanical Garden, Bronx, NY.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

4 March 2022