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Peltigera didactyla (With.) Laundon
Alternating Dog-lichen; Alternating Pelt

Photo © Malcolm Hodges, from a specimen collected in Pike Co., Ga., 13 October 2015
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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:

Element Occurrences (EOs) in Georgia: 0

Habitat Summary for element in Georgia: Disturbed roadside soil


Description

Gray thallus with rounded, cupped lobes dotted with large soralia, soredia coarse, gray; some lobes may become fertile with brown, saddle-shaped disks, those lobes generally lack soralia, but always are short, with a fine tomentum on the surface & few rhizines; lower surface pale, with low, pale network of “veins”; FIELD ID: our only sorediate pelt lichen

Similar Species

Peltigera canina also has a tomentose upper surface, but it lacks soralia; P. praetextata has tomentum along lobe edges, but it is lobulate

Related Rare Species

None

Habitat

Disturbed roadside soil

Life History

Terricolous foliose lichenized fungus, photobiont a cyanobacterium in Nostoc

Survey Recommendations

None

Range

Piedmont

Threats

Unknown

Georgia Conservation Status

Rare; probably overlooked

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. 

Tripp, E. A. & J. C. Lendemer. 2020. Field guide to the lichens of Great Smoky Mountains National Park. The University of Tennessee Press, Knoxville.

Authors of Account

Malcolm Hodges

Date Compiled or Updated

 23 June 2022