Mycosphaerellales » Mycosphaerellaceae

Didymellina

Didymellina Höhn., Annls mycol. 16(1/2): 66 (1918).

Index Fungorum number: IF 1549; Facesoffungi number: FoF xx, 10 morphological species (Species Fungorum 2022), molecular data unavailable.

Leaf spots ellipsoid-lenticular, pale brown with dark brown border. Sexual morph: Ascomata pseudothecial, black, scattered, subepidermal to erumpent, wall of 2–3 layers of brown textura angularisAsci aparaphysate, fasciculate, bitunicate, subsessile, obovoid, straight to slightly curved, 8-spored, with visible apical apiculus. Ascospores 3- to multiseriate, hyaline, non-guttulate, thin-walled, straight to slightly curved, fusoid-ellipsoid with obtuse ends, medianly 1-septate, widest in middle of apical cell, not constricted at the septum (but slightly so with age), tapering towards both ends, but slightly more to lower end; ascospores germinating while in ascomata, hyaline, slightly constricted at septum, germinating from both ends with germ tubes parallel to the long axis of the spore, in some cases germinating ascospores becoming 3-septate. Asexual morph: Unknown (adapted from Videira et al. 2017).

Type species: Didymellina iridis (Desm.) Höhn.

Notes: Didymellina is characterized by ellipsoid-lenticular, pale brown leaf spots, pseudothecial, black, scattered ascomata, bitunicate, subsessile, obovoid asci and fusoid-ellipsoid 3- to multiseriate ascospores. Müller & von Arx (1962) treated Didymellina as a synonym of Mycosphaerella. Braun et al. (2003) provided a short taxonomical overview of Didymellina iridis. Ascospores in asci are 1-septate but 3-septate ascospores were reported upon germination. Videira et al. (2017) considered Didymellina as a distinct genus. Fresh collections and DNA sequence data are needed to confirm the placement of Didymellina.

 

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