Diatrype virescens
Diatrype virescens is a carbonaceous pyrenomycete in the family Diatrypaceae. It grows uniquely on the wood of American beech in North America. Its growth structure is immersed, popping out from under the bark in scattered green fruiting bodies which soon fade to black.
Description
Diatrype virescens grows from under the bark, pushing it aside in a conspicuous manner. The fruiting body is yellowish-green, and ranges 2.5–4 mm in diameter. The color fades into brown and black and soon can look similar to Biscogniauxia marginata. There are usually several sulcate ostioles per fruiting body.Microscopic features are: "Asci clavate, p. sp. 35–40 × 4–6 μm. Ascospores 12–14 × 2.5–3 μm."
This fungus is found in North America growing only on Fagus grandifolia.