About Diatrype virescens (Schwein.) Cooke
Diatrype virescens grows from beneath bark, pushing the bark outward in a very noticeable way. Its fruiting bodies are yellowish-green, with diameters ranging from 2.5 to 4 mm. Over time, the color fades to brown and black, and aged fruiting bodies often look very similar to Biscogniauxia marginata. Each fruiting body typically contains multiple sulcate (grooved) ostioles. Microscopically, this species has clavate asci, with spore-bearing parts measuring 35–40 by 4–6 μm. Its ascospores measure (10)12–14 by 2.5–3 μm. This fungus is found in North America, where it only grows on Fagus grandifolia.
