Mytilinidion tortile  

Anamorph: conidiomata pycnidial, with conidiogenous cells 4-6 x  ca 3 µm in size producing hyaline subglobose conidia ca 2 µm diam. (Lohman 1933).
Teleomorph: ascostromata hysterothecia, 600-800 x 200-300 µm, 200-300 µm in height, oblong-elliptical in horizontal plane, the apices acute to obtuse, with an inconspicuous longitudinal furrow extending the whole length of the ascoma, faintly striate, glossy black, fairly thin-walled, carbonaceous. Interascal tissue of abundant branched and anastomosed pseudoparaphyses ca 2 µm diam., tending to break down by maturity of the ascospores. Asci 75-90 x 6-8 μm, cylindrical, with a tapering stalk 10-15 µm in length, the apex obtuse to rounded, thick-walled and fissitunicate with a distinct ocular chamber, no other apical structures, 8-spored. Ascospores arranged ± uniseriately, 13-15 x 5-6 µm, 3-septate, the septa hardly constricted within the ascus but becoming distinctly so after discharge, golden brown, quite thick-walled, smooth, without a gelatinous sheath or appendages.