Arthonia radiata is with smooth thallu, greyish white crust with embedded, black, variable but usually irregularly stellate apothecia (typically 1-2mm in diameter); ascospores 3-septate.
Similar species: Arthoniales

By Flown Kimmerling
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Uploaded Dec 6, 2020. Captured Nov 3, 2020 14:47 in 227 Oakman Rd NE, Oakman, GA 30732, USA.