Apiospora montagnei is an ascomycete (Pezizomycotina, Sordariomyces) that is commonly isolated worldwide from a variety of soil types, and from diverse dead plant material. It is usually isolated as its hyphomycete form (previously known as Arthrinium arundinis), producing the lens-shaped conidia shown in the accompanying microphotograph. The sexual stage has never been produced in culture. The species is often associated with cellulose-containing substrates and is assumed to be cellulolytic.