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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: None

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: Montane forests

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Description

Pale green-gray thallus of broad (0.5-1.5 cm wide) lobes with undersides brown at lobe edges, black in center; old lobes edged with even mounded gray-green soralia; lobes with black cilia; CHEMISTRY: medulla K+ yellow to orange, C-, KC-, PD+ orange, UV- (stictic acid); FIELD ID: in northern-tier counties, other big Parmotrema with lumpy marginal soralia & bare brown margins to lobe undersides are P. arnoldii, P. margaritatum & P. diffractaicum, differing by K &/or UV reactions in the medulla

Similar Species

Also large are Parmotrema arnoldii with KC+ pink, UV+ blue-white medulla, P. margaritatum with K+ maroon medulla & P. diffractaicum with CK+ orange, UV+ yellow medulla; Parmotrema reticulatum is smaller, has cracked lobe surfaces, undersides with rhizines up to edges & different chemistry; P. louisianae has different chemistry & is also smaller & has white undersides to lobe tips; also consider rare P. stuppeum, with more even, linear soralia & K+ maroon medulla  (see key below)

Related Rare Species

None

Habitat

Montane forests, on silicious rock & Acer bark

Life History

Saxicolous/corticolous foliose lichenized fungus, photobiont a green alga (Trebouxia?)

Survey Recommendations

None

Range

Southern Blue Ridge, Cumberland Plateau

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. 

Authors of Account

Malcolm Hodges

Date Compiled or Updated

30 May 2022