Agonimia tristicula  

Thallus minutely squamulose, often forming small, spreading, aggregated patches, squamules to 0.10-1 × 0.1-0.3(-0.5) mm, crowded, more or less contiguous and erect, sometimes nodulose and subgranular or rarely dispersed and elongate-finger-like, dull pale green-fawn to brown when dry, bright green when wet and fresh. Cells of upper cortex with small papillae 1.5-2 μm tall.
Anamorph: not known.
Teleomorph: ascomata perithecia, rather frequent, often in between and overgrown by squamules, 250-500 µm diam. and 250-600 µm tall, subglobose to broadly pyriform or barrel-shaped, very thick-walled, lacking an involucrellum, with a large and sometimes crateriform ostiole. Peridium black, matt, plicate-rugose. Interascal tissue absent, the ostiole lined with long periphyses within a gelatinous matrix. Asci clavate and fairly long-stalked, thick-walled with rostrate dehiscence, with an inconspicuous subapical apical ring, (1-) 2-spored. Ascospores (42-) 57-120 (-150) × 26-50 μm, elongate-ellipsoidal, sometimes slightly curved, the ends often apiculate, at first hyaline but eventually becoming golden to mid brown, muriform with a complex arrangement of angular cells, the septa irregular and frequently oblique, fairly thin-walled, ± smooth, without a perispore or gelatinous sheath.