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Heterodermia langdoniana Lendemer & E.Tripp
Rusty-bottom Fringe
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: GNR
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: Rocky woodland, mesic hardwood forest
Pale green lobes, edges sometimes crowded with proliferation of small lobes; some lobe tips curling back to expose white soralia beneath; lobe margins frequently sporting cilia-like rhizines; underside ecorticate, white at tips, grading to rusty-brown, then to purplish-black at center; CHEMISTRY: rusty areas on underside K-; FIELD ID: underside color is the key, as with so many fringe lichens; this one may need a field K test to confirm
Some Heterodermia have bright orange pigment on underside that reacts K+ purple
Heterodermia appalachensis, H. crocea, H. erecta
Rocky woodland, mesic hardwood forest; 5 records on silicious rock, 3 on hardwood bark
Saxicolous/corticolous foliose lichenized fungus, photobiont a green chlorococcoid alga (Trebouxia?)
None
Most records thinly scattered above the Fall Line; 1 record from the Coastal Plain
Unknown
Uncommon
None
Brodo, I. M. 2001. Lichens of North America. 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 March 2022