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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: GNR

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: Mesic hardwood forests and swamps

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Description

Pale gray-green to yellow-green thallus of small, fairly adnate lobes about 1.5-3 mm wide; undersides brown & without rhizines at lobe edges, black in center; old lobes with abundant isidia, cylindrical to branched, not topped with cilia; lobes with sparse, short black cilia at edges, mostly in axils of lobes; CHEMISTRY: medulla K+ yellow, C-, KC+ pink, UV- (stictic acid, norlobaridone); FIELD ID: most in Similar Species below are much larger except Parmotrema subisidiosum, which can be eliminated with a look at the undersides & a field K test to the medulla

Similar Species

Parmotrema crinitum is much larger & its medulla also reacts K+ yellow, but is KC-; P. xanthinum has a yellow-green upper surface, its isidia are rarely ciliate, & its medulla is not reactive to chemicals or UV light; P. ultralucens has a UV+ yellow medulla; P. subisidiosum is also small but has cracked lobe surfaces & its medulla reacts K+ blood red; P. mellissii has a UV+ blue-white medulla (see key below)

Related Rare Species

Parmotrema diffractaicum

Habitat

Mesic hardwood forests & swamps, on Taxodium, Acer & Nyssa bark

Life History

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

Survey Recommendations

None

Range

Records from Piedmont & Coastal Plain

Threats

Unknown

Georgia Conservation Status

Rare, possibly overlooked

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

26 May 2022