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Peltigera horizontalis (Huds.) Baummg.
Flat-fruited 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: Mesic forests
Gray thallus with moderately broad (1-2.5 cm), glossy lobes, only moderately ruffled; large brown to reddish-brown apothecia at lobe tips held relatively flat, not vertical, curled or saddle-shaped; undersides with dark (on inner part & some outer lobes), fuzzy veins often pale or indistinct on outer lobes; rhizines often organized into concentric rings; FIELD ID: if very fertile, the flat apothecia make this lichen unmistakable
Peltigera neopolydactyla is often larger, with lobes up to 2.5 cm across, & has a broad pale area on underside of most lobe tips, with dark veins on older parts; P. polydactylon is similar in size with dark veins reaching to tips of lobes; both these species have saddle-shaped apothecia & rhizines randomly distributed along veins
None
Mesic forests, on soil or moss, the latter sometimes over tree bases or rock
Terricolous/muscicolous foliose lichenized fungus, photobiont a cyanobacterium in Nostoc
None
Southern Blue Ridge, Piedmont
Unknown
Rare
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.
Malcolm Hodges
23 June 2022
