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Abrothallus caerulescens Kotte
Black-spot parasite

Photo © Malcolm Hodges, from a specimen collected in Carroll Co., Ga., 22 June 2013
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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


Description

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

Similar Species

None, on this host

Related Rare Species

None

Habitat

Parasitic on Xanthoparmelia conspersa, common on silicious rock

Life History

Obligate lichenicolous fungus, apparently not fatal to host

Survey Recommendations

None

Range

Probably more widespread than records indicate

Threats

Unknown

Georgia Conservation Status

Rare but likely overlooked

Conservation Management Recommendations

None

References

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.

Authors of Account

Sean Beeching & Malcolm Hodges

Date Compiled or Updated

27 February 2022