Acanthostigma septoconstrictum

Acanthostigma septoconstrictum is a species of fungus in the Tubeufiaceae family of fungi. It was isolated from decomposing wood in the Great Smoky Mountains National Park. A. septoconstrictum differs from its cogenerate species by having longer setae and asci and broader, asymmetrical ascospores which are constricted at their septa.