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Peltigera didactyla (With.) Laundon
Alternating Dog-lichen; Alternating Pelt
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
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
Peltigera canina also has a tomentose upper surface, but it lacks soralia; P. praetextata has tomentum along lobe edges, but it is lobulate
None
Disturbed roadside soil
Terricolous foliose lichenized fungus, photobiont a cyanobacterium in Nostoc
None
Piedmont
Unknown
Rare; probably overlooked
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.
Tripp, E. A. & J. C. Lendemer. 2020. Field guide to the lichens of Great Smoky Mountains National Park. The University of Tennessee Press, Knoxville.
Malcolm Hodges
23 June 2022