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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: None

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: Massive rock outcrops

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Description

Pale yellow-green thallus adnate, often in an orderly rosette with older parts at center eventually dying & replaced with proliferating propagules; lobes 1.5-4.5 mm wide; short globular isidia abundant in older parts of thallus; apothecia absent to common; underside black; CHEMISTRY: medulla K+ yellow (to orangish), PD+ orange (stictic acid complex); FIELD ID: taking care to note underside color & presence of isidia then conducting a field K test to medulla, ID can still be subjective, based on thallus habit (see Similar Species)

Similar Species

Xanthoparmelia isidiascens has isidia & black undersides & is virtually identical chemically, but is less adnate to rock, with narrow lobes climbing over one another, creating a jumble rather than a neat rosette

Related Rare Species

Xanthoparmelia hypomelaena, X. isidiascens, X. piedmontensis

Habitat

Massive rock outcrops, on silicious rock

Life History

Saxicolous foliose lichenized fungus, photobiont an alga in Trebouxia

Survey Recommendations

None

Range

Statewide where silicious rock is present

Threats

Unknown

Georgia Conservation Status

Common to abundant in proper habitat

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.

Harris, R. C. & D. Ladd. 2005. Preliminary draft: Ozark lichens. Unpublished manuscript, New York Botanical Garden, Bronx, NY.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

3 August 2022