Melanelixia glabra

Foliose lichen.
The thallus is adnate to rather loosely adnate, foliose, up to 11 cm in diameter.
The lobes are lobate: short and rounded to slightly elongate, contiguous to imbricate, 2-5 mm broad.
The upper surface is more or less flat, olive-green to dark olive-brown, sometimes tinged yellowish or reddish. It is occasionally lightly pruinose, bearing tiny, hyaline, cortical hairs, these dense to sparse (rarely totally absent) but usually present at least on some lobe ends and apothecial margins.moderately rhizinate, the rhizines concolorous with the lower surface.
The apothecia are common, up to 8 mm diam., sessile to short stipitate, at first concave, becoming irregularly flattened with age, the margin entire when young, soon becoming crenate, crenate-papillate, or even reticulately ridged,