Acarospora janae K. Knudsen  

Mycobank MB 516796

Thallus of dispersed epruinose areoles, dark brown to light brown, with a single immersed apothecium, at first punctiform, becoming dilated and the areole rarely lobulate. Lacking faveoles but upper surface often with fine striations. Lacking a stipe, broadly attached, lower surface white and ecorticate. Disc epruinose, same color or darker than the thallus, rough, sometimes with umbos and ridges, disappearing as disc fully dilates. Algal layer not interrupted. Exciple and hypothecium indistinct. Subhymenium 30–40 µm high. Hymenium ca. 100 µm tall, paraphyses 2 µm in diam. Asci clavate, ca. 60 x 20 µm. Ascospores about 100 per ascus, 3–4 x 2 µm. Secondary chemistry: gyrophoric acid.