Microthyrium versicolor  

Mycelium superficial, composed of pale yellow to brown hyphae 1.5-2.5 µm broad, branched and septate, with numerous slight swellings from which the subcuticular hyphae arise.
Anamorph: not known.
Teleomorph: stromata absent. Ascomata thyriothecia, to 300 µm diam., orbicular, scattered, occasionally confluent, shallowly convex. Upper wall composed of narrow elongate wavy closely packed radiating brown cells ca 2 µm broad, extending into a slight fringe. In the ostiolar region the cells are cuboid and ca 2 µm diam. Interascal tissue composed of narrow septate branched pseudoparaphyses 1-1.5 µm diam. Asci numerous, 40-56 x 10-12 µm, ellipsoidal to clavate, thick-walled and fissitunicate, 8-spored. Ascospores 11-14.5 x 3.5-5 µm, hyaline, clavate to slipper-shaped, 1-septate. The upper cell is widest just above the septum, the apex with two ciliate appendages, but these are often lost. Young spores are 4-guttulate.