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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:

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: In habitats with trees or shrubs

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Description

Pale green-gray thallus of narrow, occasionally broad (0.5-1.5 cm wide) lobes, surfaces covered in network of fine cracks; undersides brown at lobe edges, black in center, with long rhizines to edges of lobes; old lobes edged with even mounded gray-green soralia, often globular & perched atop short side lobes; lobes margins with black cilia; CHEMISTRY: medulla K+ blood red, C-, KC-, PD+ orange, UV- (salazinic acid); FIELD ID: most sorediate ruffles are big, bold species; 2 other usually small species are Parmotrema subisidiosum, also common & closely similar, but its soralia are smaller & more irregular, & lobes are usually also isidiate at least to some degree along margins, if not on lobe surfaces; & P. louisianae, rare, chemically different & with at least some white along underside margins

Similar Species

Large sorediate ruffles include Parmotrema diffractaicum, larger, with fewer cracks on lobe surfaces & a medulla that reacts CK+ orange, UV+ yellow; P. perlatum, UV-, PD+ orange medulla; P. arnoldii has KC+ red, UV+ blue-white medulla; & P. margaritatum, K+ maroon medulla (see key below)

Related Rare Species

Parmotrema diffractaicum

Habitat

In habitats with trees or shrubs; substrates: hardwood bark: 27% Quercus, 8% Acer & 38% other hardwoods or unknowns; conifer bark: 6% Taxodium, 5% Juniperus & 9 records on Pinus; 11% on silicious rock & 1 record on moss over bark 

Life History

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

Survey Recommendations

None

Range

Statewide

Threats

Unknown

Georgia Conservation Status

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. 

Authors of Account

Malcolm Hodges

Date Compiled or Updated

30 May 2022