Microthecium japonicum

Microthecium japonicum is a species of fungus in the family Ceratostomataceae. It was first described as a new species in 1986, as Persiciospora japonica. The species epithet refers to Japan, where the type specimen was collected in 1975. It was reclassified in Microthecium in 2018.
It is distinguished by its ostiolate ascomata and ellipsoid to spindle-shaped ascospores with a pitted, net-like surface pattern. It resembles M. moureai in these general features, but differs in producing a phialidic asexual form and small bulbil-like propagules, which are absent in M. moureai. The spore surface in M. japonicum is also more finely reticulate, whereas M. moureai has a coarser reticulation.