Pleosporales » Didymellaceae


Allophoma Qian Chen & L. Cai, in Chen et al., Stud. Mycol. 82: 162 (2015).

Index Fungorum number: IF 814058; Facesoffungi number: FoF 08217, 11 morphological species (Species Fungorum 2022), 11 species with molecular data.

Pathogenic on host. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, globose to flask-shaped, superficial on or immersed into the agar, solitary or confluent, ostiolate. Pycnidial wall pseudoparenchymatous, 2–5-layered. Conidiogenous cells phialidic, hyaline, smooth, ampulliform to doliiform, sometimes flask-shaped or isodiametric. Conidia variable in shape and size, hyaline, thin-walled, smooth, aseptate, i.e. ovoid, oblong, ellipsoidal to cylindrical, or slightly allantoid, mostly guttulate (adapted from Chen et al. 2015).

 Type species: Allophoma labilis (Sacc.) Qian Chen & L. Cai

Notes: Allophoma is characterised by globose to flask-shaped conidiomata, phialidic, hyaline, smooth, ampulliform to doliiform conidiogenous cells and ovoid, oblong, ellipsoidal to cylindrical conidia. Several authors added new species to Allophoma (Chen et al. 2017; Valenzuela-Lopez et al. 2018; Babaahmadi et al. 2018). Allophoma is morphologically similar to other phoma-like genera and can be differentiated based on phylogenetic analyses only. Recently, Jayasiri et al. (2019) added the new species A. siamensis. The ideal molecular markers to differentiate among species of Allophoma are ITS, LSU, BTUB, and RPB2 (Chen et al. 2015, 2017; Valenzuela-Lopez et al. 2018). Allophoma is morphologically and phylogenetically a distinct genus in Didymellaceae. Molecular markers available for Allophoma are ITS, LSU, SSU, Actin, BTUB, RPB2 and TEF-1.


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