on dead buttonwood bark (Conocarpus erectus)
THALLUS: yellowish, UV+ v yellow, crust filled w/ fine POL+ crystals, K+ forming red acicular crystals
ALGAE: trebouxioid, 5-6 µm
APOTHECIA: black, sessile, contorted, raised black continuous smooth rim, dense yellowish pruina, epihymenium full of polarizing crystals and K+ recrystallizing as radiating acicular crystals, hymenium clear, subhymenium medium brown clearing upward, hypothecium opaque dark brown, no oil in hymenium
SPORES: Physcia-type, brown, smooth, 2-celled, even thin walls, elliptical, 13.4-16 × 7-7.5 µm, 8 per ascus, most deformed

Curtis Bjork helped me ID this. Used R. C. Harris’s More Lichens of Florida to secure genus, then found a key to tropical corticolous Buellia on-line at Our spores are a bit large, but otherwise matches quite well. R. C. Harris keys it to B. melanochlora, however, that species has textured spores.

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Used references: R. C. Harris’s More Lichens of Florida
Based on microscopic features
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