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Federal Protection: No US federal protection

State Protection: No Georgia state protection

Global Rank: GNR

State Rank: SU

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: Small-stream swamp forest

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Description

Pale green-gray thallus continuous to rimose-areolate; disks reddish-brown, with thick, white ecorticate rims, remaining smooth (“unbeaded”) into maturity; exciple visible as brown ring surrounding disk just inside white rim; disks fairly small, 0.5-1 mm in diameter; CHEMISTRY: thallus K+ red (norstictic acid); MICROSCOPY: epihymenium brown (pigment dissolving in KOH wet mount), amphithecium with fine crystals in polarized light; FIELD ID: possible with field K test, though should be confirmed with dissection due to extreme rarity

Similar Species

Other bark Lecanora with brown disks: L. chlarotera has white rims (especially when young), but has a thin pruina on apothecia & large crystals in amphithecium (not in swamps in lower Coastal Plain); L. hybocarpa (abundant in same habitat) has corticate, often beaded rims, & large crystals in amphithecium; neither of these species has a noticeable excipular ring between disk & rim, or thallus that reacts K+ red

Related Rare Species

None

Habitat

Small-stream swamp forest (“bay strand”), on Acer bark

Life History

Corticolous crustose lichenized fungus, photobiont a unicellular green alga (Pseudotrebouxia)

Survey Recommendations

Search type locality for additional material; if successful, expand search out from there in suitable habitat

Range

Coastal Plain (Pierce Co.)

Threats

Unknown

Georgia Conservation Status

Rare (single specimen is only known occurrence)

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.

Knudsen, K., J. C. Lendemer & R. C. Harris. 2011. Studies in lichens and lichenicolous fungi – no 15: miscellaneous notes on species from eastern North America. Opuscula Philolichenum 9: 45-75.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

1 August 2022