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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: Forests, ultramafic rock outcrop

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Description

Pale green-gray thallus of broad (0.5-1 cm wide) lobes, undersides white at lobe tips, black at center; lobe margins dotted with oval pale green soralia interspersed with black cilia; CHEMISTRY: medulla K-, KC+ pink, C-, PD-, UV+ blue-white (alectoronic acid); FIELD ID: a field K test to medulla will sort the 2 closest lookalikes (see Similar Species)

Similar Species

Parmotrema hypoleucinum & P. hypotropum have smaller soralia, longer cilia, white undersides & medullae that react K+ yellow or red, respectively; none of the following marginally sorediate Parmotrema have white on undersides: P. arnoldii has identical chemistry, but is larger; P. reticulatum is smaller, has cracked lobe surfaces & a K+ red medulla; P. perlatum has UV-, PD+ orange medulla (see key below)

Related Rare Species

None

Habitat

Forests, ultramafic rock outcrop, on hardwood branches, soapstone

Life History

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

Survey Recommendations

None

Range

Piedmont; 1 record from Southern Blue Ridge

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.

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

26 May 2022