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Psorula rufonigra (Tuck.) Gotth. Schneider
Blue-edged Scale
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: G4G5
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: Silicious rock outcrops, sunny woodland boulders
Variable, gray to black when dry, sometimes with a bluish cast & pale edges to squamules, dark green when wet; squamules 1-2 mm across, often lobed & shingled or overlapping; apothecia flat, black, dark blue when wet; this species is invariably in a complex with the micro-filamentous cyanobacterial lichen Spilonema revertens, on which it may be a parasite or have an obligate dependence of some sort
None
None
Silicious rock outcrops, sunny woodland boulders, on a wide variety of silicious rock, including sandstone (especially Altamaha Formation), granite, gneiss, soapstone/serpentinite & indurated kaolin
Saxicolous squamulose lichenized fungus, photobiont a chlorococcoid alga
None
Coastal Plain, Piedmont, Southern Blue Ridge
Unknown
Uncommon to fairly common where it occurs
None
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 Unpublished manuscript, New York Botanical Garden, Bronx, NY.
Malcolm Hodges
5 August 2022