Morphological features of the genus Microthecium. Microthecium levitum (FMR 10098). A Non-ostiolate ascoma E Asci G Ascospores K Ascospore (SEM). Microthecium fayodii (FMR 12363). B Ostiolate ascomata F Ascospores O Variable shaped bulbils. Microthecium fimicola (FMR 5483). C Detail of cellular neck M Ascospores (SEM) P Bulbil. Microthecium quadrangulatum (CBS 112763T). D Crown of setae around the ostiole L Ascospore SEM. Microthecium retisporum (NBRC 8366). H Ascospores N Asexual morph. Microthecium japonicum (FMR 12371) I Ascospores J Ascospore SEM. Microthecium sepedonioides (FMR 11933) Q Bulbil. Scale bars: 50 μm (A, B, O); 20 μm (C, D); 10 μm (E–I, P, Q); 5 μm (J, L–N); 2.5 μm (K).