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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: G3G5

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: Mesic hardwood forests and swamps

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Description

Pale green to yellow-green thallus of 0.5-1-cm-wide lobes; undersides brown & without rhizines at lobe edges, black in center; old lobes with abundant isidia on surface and along margins, sparsely ciliate at tips, cylindrical to branched; lobes ciliate at margins; CHEMISTRY: cortex K-, KC+ gold (usnic acid); 2 chemical races distinguished by medullary chemistry: all reactions negative (no substances), or K-, KC+ red, C+ pink, PD, UV- (gyrophoric acid); FIELD ID: a field K test to medulla will help sort big isidiate/ciliate ruffles, especially if light is too bright to make a UV test easy

Similar Species

Other isidiate Parmotrema have K+ yellow cortex & most are gray; P. ultralucens is also sometimes greenish-yellow, at least in part, but has K+ red, UV+ yellow medulla (see key below)

Related Rare Species

None

Habitat

Mesic hardwood forests & swamps; substrates: hardwood bark: 30% Quercus & 20% other hardwoods or unknowns; conifer bark: 11% Taxodium, 8% Juniperus, 2 records on Pinus & 1 on Tsuga; 24% on silicious rock; 2 records on moss over rock

Life History

Corticolous foliose lichenized fungus, photobiont a green alga (Trebouxia?)

Survey Recommendations

None

Range

Statewide

Threats

Unknown

Georgia Conservation Status

Common

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

10 June 2022