Dothideomycetes families incertae sedis » Polystomellaceae

Dothidella

Dothidella Speg., Anal. Soc. Cient. Argent. 9: 9 (1880).

Index Fungorum number: IF 1695; Facesoffungi number: FoF 06490, 34 morphological species (Species Fungorum 2022), no molecular data available.

= Polystomella Speg., Anal. Soc. cient. argent. 26(1): 53 (1888).

Biotrophic or parasitic on leaves. Sexual morph: Ascostromata black, superficial to erumpent, pulvinate, and circular to suborbicular, elliptical or elongate, globose to subglobose, with five to numerous locules, with individual central ostioles. Cells of ascostromata composed of dark brown-walled cells of textura angularis. Peridium of locules composed of small heavily pigmented thick-walled cells of textura angularis. Hamathecium comprising numerous, hyaline, septate or aseptate pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, oblong, cylindro-clavate or obclavate with a short pedicel, apically rounded, with a small ocular chamber. Ascospores 2-seriate, ellipsoidal or obpyriform, hyaline, uniseptate, upper cell wider and shorter than the lower cell, euseptate, constricted at the septum, lacking a sheath. Asexual morph: linked to Stictochorella (adapted from Hyde et al. 2013).

Type species: Dothidella australis Speg.

Notes: Dothidella is characterised by black, superficial to erumpent, pulvinate ascostromata, oblong, cylindro-clavate or obclavate asci, and ellipsoidal or obpyriform, hyaline, uniseptate ascospores. Several Dothidella species have been transferred to Endodothella, Microcyclus, Phyllachora, Rehmiodothis and Stigmochora which belong to Mycosphaerellaceae and Phyllachoraceae. Dothidella differs from these genera in having multi-loculate ascostromata and ellipsoidal, hyaline, two-celled ascospores while species of Phyllachora (Phyllachoraceae) have unilocular ascostromata, unitunicate asci and one-celled, hyaline ascospores and Microcyclus (Mycosphaerellaceae) has multi-loculate ascostromata with two-celled hyaline obovoid ascospores (Liu et al. 2012a, b, Monkai et al. 2013). Dothidella is a distinct genus in Polystomellaceae but lacks sequence data. Fresh specimens with DNA sequence data are needed to confirm the generic placement of the genus.

 

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