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Lecidea cyrtidia Tuck.
Olive-drab Tile
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: Rock outcrops, rocky upland forests
Dull olive-green to brown thallus continuous to rimose, black disks about 0.3-0.6 mm in diameter; black rims on young disks disappearing with age, disks becoming more convex; MICROSCOPY: disk biatorine with radiating exciple, outer exciple pale, inner brown, paraphyses brown-capitate creating brown epihymenium, spores hyaline, simple, ellipsoid, 8/ascus, 5.5-10 x 3.5 µm; FIELD ID: requires dissection
Other small black-disked crusts on rock, especially Leimonis erratica, which has blue-green color in upper hymenium & a darker thallus
None
Rock outcrops, rocky upland forests, on silicious rock, including rock fragments & pebbles
Saxicolous crustose lichenized fungus, photobiont a unicellular green alga
None
Cumberland Plateau, Piedmont, Southern Blue Ridge
Unknown
Rare, though likely frequently 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
19 April 2022