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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:

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: Limerock outcrops, pebbles

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Description

Endolithic thallus showing as white or pale green-gray; semi-immersed to superficial round black disk up to 0.4 mm in diameter, with thin rim, rough surface of disk; MICROSCOPY: spores colorless, simple, halonate, 8/ascus, about 17-26 x 6-11 µm; FIELD ID:  dissection required

Similar Species

Other buttons in Ga. with thin or disappearing thalli on calcareous rock include Bacidia coprodes, Bacidina egenula & Catillaria lenticularis; Clauzadea chrondrodes has not been recorded in Ga., but its spores are smaller

Related Rare Species

None

Habitat

Limerock outcrops, pebbles, on limestone

Life History

Saxicolous crustose lichenized fungus, photobiont a unicellular green alga (Trebouxia)

Survey Recommendations

None

Range

Cumberland Plateau, Ridge & Valley

Threats

Unknown

Georgia Conservation Status

Rare

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 Unpublished manuscript, New York Botanical Garden, Bronx, NY.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

25 July 2022