TYPE. UNITED STATES. ALABAMA, Beaumont[?], Anonymous, s.n. (US 01032266, specimen A, syntype).

Description. Non-lichenized, allied fungus.

Thallus crustose, thin, greenish-gray, smooth, inconspicuous. Photobiont absent. Ascomata arthonioid apothecia, irregular to stellate; disk flat to convex, black. Ascospores fusiform-ovoid, 2-celled 19-26 x 7.5-9 μm.

Chemistry. Not reported.

Substrate and Habitat. Corticolous on trees.

Distribution. Southeastern North America (Louisiana to North Carolina); in North Carolina in the eastern Piedmont.

Notes. The syntype collection in US includes multiple thalli: one marked "A" from Alabama and matches the description in Willey (1890), and multiple fragments marked "B" from Florida, collected by Calkins in 1885.  Richard C. Harris annotated the specimens as A “?=Schizothyriaceae, non-lichenized” and B as a mixture, neither matching the protologue.  The "A" syntype appears to be an Arthonia via morphology and thus appears to be the true type for this taxon, but needs further examination to verify the ascus type as well as the ascomatal anatomy in general.

Literature

Fink, B. (1935) The Lichen Flora of the United States. University of Michigan Press, Ann Arbor. 426 pp.

Willey, H. (1890) A synopsis of the genus Arthonia. New Bedford. 62 pp (original description).