Cercidospora thamnoliae  

Vegetative hyphae indistinct, surface mycelium absent.
Anamorph: not known.
Teleomorph: ascomata perithecia, (60–) 90–130 (–200) µm diam., subglobose, black, smooth, the ostiole 15–30 µm diam., almost always immersed, rarely slightly protruding in the ostiolar area, scattered and dispersed. Peridium 30–40 µm thick, dark bluish green above, often with a grey shade, hyaline below, composed of epidermoid to angular cells 3–10 µm diam., K−. Hymenial gel I−, K/I−. Interascal tissue of abundant narrow pseudoparaphyses 1·5–2·0 µm diam., septate with individual cells 6–15 µm long, rather frequently branched and anastomosed, not swollen at the apices. Asci (41–) 53–69 (–80) × (10–) 11–15(–18) µm, ± cylindrical, short-stalked to almost sessile, usually moderately thickened in the lower part, thick-walled and fissitunicate, often with a small ocular chamber, not staining in iodine, (4–) 8-spored. Ascospores arranged obliquely uniseriately or biseriately, (12·5–) 16·5–21·0 (–27·5) × (4–) 4·5–5·5 (–8) µm, l/b = (2·5–) 3·2–4·2 (–5·4), narrowly soleiform with an attenuated lower part, rarely almost ellipsoidal, the upper or both ends often acute, with (1–) 3 (–4) septa, not or slightly constricted at the septa (markedly so only when overmature), hyaline, smooth- walled, with a gelatinous sheath 1·0–1·5 µm thick.