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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 High Priority Species (SGCN): No

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: Mesic hardwood forests

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Description

Pale thallus with flattened black disks, rounded to irregular in shape; MICROSCOPY: spores submuriform (1-3 cells divided longitudinally), often bent or kidney-bean-shaped, wider at one end; FIELD ID: the "blot" commas vary subtly in thallus color and blot shape, but can only reliably be told apart by dissection & chemical tests

Similar Species

Arthonia apatetica has 2-celled spores & a chlorococcoid photobiont; A. mesoleuca has muriform spores as large as 50 x 20 µm and a K-reactive pigment; A. platygraphidae has spores with 11-17 transverse septa separating cells (not muriform); Arthothelium ruanum has muriform to submuriform spores as large as 23 x 10

Related Rare Species

None

Habitat

Mesic hardwood forests, on hardwood bark, especially Acer & Quercus

Life History

Corticolous crustose lichenized fungus, photobiont an alga in Trentepohlia

Survey Recommendations

None

Range

Coastal Plain

Threats

Harvesting old-growth hardwood forests

Georgia Conservation Status

Uncommon

Conservation Management Recommendations

Conserve mature Coastal Plain hardwood bluff forests

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 Unpublished manuscript, New York Botanical Garden, Bronx, NY.

Lücking, R., F. Seavey, R. S. Common, S. Q. Beeching, O. Breuss, W. R. Buck, L. Crane, M. Hodges, B. P. Hodkinson, E. Lay, J. C. Lendemer, R. T. McMullin, J. A. Mercado-Diaz, M. P. Nelsen, E. Rivas Plata, W. Safranak, W. B. Sanders, H. P. Schaefer Jr., & J. Seavey. 2011. The lichens of Fakahatchee Strand Preserve State Park, Florida: proceedings from the 18th Tuckerman Workshop. Florida Museum of Natural History Bulletin Vol. 49: 127-186.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

27 February 2022