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Parmotrema gardneri (Dodge) Serus.
Gardner's Ruffle
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: G4G5
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: Mesic hardwood forests, swamps
Relatively small, green-gray thallus of moderately broad, strongly fluted lobes with undersides brown at lobe edges (black in center); all but newest lobes edged with greenish-white soralia; lobes non-ciliate; CHEMISTRY: medulla/soralia K-, KC+ pink, C-, PD+ red (protocetraric acid); FIELD ID: a KC test will tell you it is not Parmotrema praesorediosum, its nearest lookalike
Parmotrema austrosinense is larger with white undersides & KC+, C+ red medulla; P. praesorediosum is similar but its medulla is unreactive to chemical tests (see key below)
None
Mesic hardwood forests, swamps; substrates: 5 records from Quercus bark, 7 from other hardwoods; 2 records from Taxodium bark, & 1 each from Juniperus & Pinus
Corticolous foliose lichenized fungus, photobiont a green alga (Trebouxia?)
None
Mostly Coastal Plain & Piedmont; also reported from Southern Blue Ridge
Unknown
Occasional
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
25 May 2022
