Micronectriella Höhn., Sber. Akad. Wiss. Wien, Math. -naturw. Kl., Abt. 1 115: 1194 (1906).
Associated with leaf spot. Sexual morph: Perithecia yellow-brown, oval to sphaerical, with a cylindrical, hyaline to brownish neck. Asci clavate-spindle shaped, 8-spored sometimes with a few filiform paraphyses. Ascospores hyaline to very slightly yellowish more or less 2-seriate and fusiform mainly 3-septate, seldom 5-septate not constricted at the septa. Asexual morph: Unknown (adapted from description of M. agropyri in Apinis and Chesters 1964).
Type species: Micronectriella pterocarpi (Racib.) Höhn.
Notes: Micronectriella is characterised by narrow, hyaline, cylindrical saccate ascospores. Micronectriella pterocarpi was previously placed in Sphaerulina as S. pterocarpi. Quaedvlieg et al. (2013) showed that Sphaerulina is a distinct genus in Mycosphaerellaceae based on phylogenetic analysis of LSU and RPB2 sequence data. The type specimen of M. pterocarpi is lost. The placement of Micronectriella in Mycosphaerellaceae is doubtful. Fresh collections with DNA sequence data are needed to confirm the generic placement of Micronectriella.