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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: Upland woodlands, forests

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Description

Pale green-gray thallus of broad (1cm wide) main lobes & strap-like side lobes 1-2 mm wide; lobe surfaces covered with dense, reticulate pattern of minute cracks; undersides brown at lobe edges, black in center, with dense growth of long rhizines to lobe edges; lobes with abundant, long black cilia; apothecia common to rare (look for tiny buds on thallus surface), brown cups, with or without central perforation; CHEMISTRY: medulla K+ blood red (salazinic acid); FIELD ID: given abundance of Parmotrema perforatum complex & P. submarginale, take care to check undersides for color & position of rhizines, & upperside for reticulate cracks

Similar Species

Rare Parmotrema despectum is similar in size & chemically, but its undersides lack rhizines in a broad zone near edges; P. perforatum is larger, with broad white edges to undersides & no rhizines near lobe edges; P. submarginale lacks cracked upper surface, has no perforations on apothecia, lacks rhizines near lobe edges, & its medulla is K- (see key below)

Related Rare Species

None

Habitat

Upland woodlands & forests, on hardwood bark, mostly Quercus & Acer

Life History

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

Survey Recommendations

None

Range

Mostly Piedmont & Southern Blue Ridge, with a few scattered occurrences in Coastal Plain

Threats

Unknown

Georgia Conservation Status

Rare

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

24 May 2022