Claussenomyces atrovirens  

Anamorph: not known.
Teleomorph: ascomata apothecia, 0.5-1.5 mm diam., rather variably shaped, globose, lens-shaped or urceolate, sometimes cup-shaped, sessile, emerald-green to dark green, located singly or in small clusters on a poorly developed dark brown subiculum composed of dark brown septate hyphae 3-4 µm in diam. Disc flat to convex, smooth, emerald-green to dark green, sometimes with yellowish tinges. Outer surface smooth or minutely pruinose, concolorous with the disc, the margin regular, sometimes undulate. Flesh rather tough, waxy-elastic, olivaceous green. Excipulum made up of two layers: a gelatinised ectal excipulum of intertwined hyphae ca 2 µm diam., and a medullary excipulum of less dense intertwined hyphae that are also immersed in a gel matrix. Interascal tissue composed of narrow paraphyses, slightly enlarged (up to 3 μm diam.) and branched in the upper part, where they contain greenish pigments. Asci formed from croziers, 90-120 × 10-12 μm, clavate, thin-walled but with a greatly thickened apical part, not blueing in iodine, initially 8-spored and becoming multispored by fragmentation. Ascospores biseriate in the ascus, 16–21 (-28) × 3–5 μm, clavate to cylindric-fusiform, smooth, hyaline, with 7–10 transverse septa (sometimes further divided with an oblique longitudinal septum), when mature fragmenting into secondary spores 2–2.5 × ca 1 μm in size.