Mycosphaerellales » Mycosphaerellaceae


Exutisphaerella Videira & Crous, in Videira et al., Stud. Mycol. 87: 351 (2017).

 Index Fungorum number: IF 822590; Facesoffungi number: FoF 08500, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.

Pathogenic on host. Sexual morph: Ascomata pseudothecial, globose to slightly elongated or elliptical, emerging through the epidermis, solitary or gregarious, ostiole apical. Asci club-shaped, stipitate, 8-spored. Ascospores hyaline, oblong, fusiform-elliptical, straight or slightly curved, 1-septate, not constricted at septa, with cells of equal size. Asexual morph: acervular-like. Conidiophores ampulliform, in compact bunches. Conidia hyaline, bacillar to allantoid, rounded at the tip, truncate at the base, straight to slightly curved, aseptate to multiseptate. Spermagonia in stromata, barely erumpent to completely exposed, globose to oval or pyriform, apical ostiole. Spermatia bacillar to pyriform (Adapted from Videira et al. 2017).


Type species: Exutisphaerella laricina (R. Hartig) Videira & Crous


Notes: Exutisphaerella was introduced by Videira et al. (2017) with E. laricina as type species.  E. laricina previously known as M. laricina was reported to infect the host Larix europaea (Pinaceae) in Germany. The asexual morph of Exutisphaerella is reported as a Cercoseptoria (fide D.F. Farr et al., 1989; Corlett 1991), presently treated as synonym of Pseudocercospora or a Leptostroma (fide Tomilin 1979).  The asexual morph of Exutisphaerella is characterized by acervular conidiomata, lined with ampulliform conidiophores with truncate apices, forming hyaline and bacillar conidia, 1–4-septate (Patton 1983).  Exutisphaerella is a distinct genus in Mycosphaerellaceae based on both morphology and phylogeny.


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