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Dirinaria picta (Sw.) Clem. & Schear
Powdery Medallion

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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, woodlands, swamps and anthropogenic landscapes


Description

Crowded pale-green lobes tightly adhering to substrate, dividing to fill all space as lichen grows out; older parts of thallus with mounded, discrete soralia; no rhizines on black underside; FIELD ID: unmistakable with careful observation, distinguishing soralia from pustules of D. aegialita, with substrate usually definitive

Similar Species

Dirinaria applanata is virtually identical, told by subtle or qualitative characters, but appears to be a more southerly lichen, as yet unrecorded in Ga.; D. frostii is mostly north of Fall Line, always on massive silicious rock

Related Rare Species

None

Habitat

Forests, woodlands, swamps & anthropogenic landscapes; substrates: 87% hardwood bark, especially Quercus & Acer; 10% conifer bark; 1 record on limestone, 1 on silicious gravel

Life History

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

Survey Recommendations

None

Range

Coastal Plain

Threats

Unknown

Georgia Conservation Status

Fairly 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

27 July 2022