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Abrothallus caerulescens Kotte
Black-spot parasite
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: Sunny rock outcrops
Black disks about 0.2-0.4 mm in diameter, on host thallus; MICROSCOPY: spores brown, 2-celled, cells unequal, ornamented, about 13-16 x 5-7 µm; FIELD ID: host & disk characteristics strong clues, but dissection recommended
None, on this host
None
Parasitic on Xanthoparmelia conspersa, common on silicious rock
Obligate lichenicolous fungus, apparently not fatal to host
None
Probably more widespread than records indicate
Unknown
Rare but likely overlooked
None
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.
Nash III, T. H., B. D. Ryan, P. Diederich, C. Gries & F. Gungartz (eds.). 2004. Lichen flora of the greater Sonoran Desert region. Vol. II. Lichens Unlimited, Arizona State University, Tempe.
Sean Beeching & Malcolm Hodges
27 February 2022