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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: G5

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, rocky woodlands

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Description

Dark gray/black to dull greasy olive (wet) thallus with variably adnate lobes; lobes with lumps and depressions like blistered paint, especially along ridges radiating from thallus center; ridges covered with small isidia, maturing from globular to cylindrical; FIELD ID possible with experience, but dissection may be necessary to distinguish Collema from Leptogium

Similar Species

Collema subflaccidum lacks sharply defined blisters & ridges, is more smoothly ruffled & less adnate; Leptogium species have a cellular cortex

Related Rare Species

None

Habitat

Forests, rocky woodlands; substrates: hardwood bark: 30% Carya, 24% Quercus, 13% Fraxinus & 15% other hardwoods; 15% silicious rock; 1 record on Juniperus bark

Life History

Corticolous foliose lichenized fungus, photobiont a cyanobacterium in Nostoc

Survey Recommendations

None

Range

Statewide north of 31.8°N (not in southern Coastal Plain)

Threats

Unknown

Georgia Conservation Status

Uncommon

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.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

25 July 2022