Pleosporales » Didymellaceae


Juxtiphoma Valenz.-Lopez, Cano, Crous, Guarro & Stchigel, in Valenzuela-Lopez et al., Stud. Mycol. 90: 40 (2017).

Index Fungorum number: IF 821111; Facesoffungi number: FoF 08224, 2 morphological species (Species fungorum 2022), 2 species with molecular data.

Pathogenic on host. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, brown, mostly solitary, sometimes confluent, pycnidial wall of textura angularis, glabrous, subglobose to conical, papillate, ostiolate. Conidiogenous cells phialidic, hyaline, smooth-walled, ampulliform. Conidia aseptate, hyaline, smooth- and thin-walled, ovoid, ellipsoidal or cylindrical, biguttulate. Chlamydospores aseptate, ochraceous-brown, single or in chains, subglobose, barrel-shaped or ellipsoidal (adapted from Valenzuela-Lopez et al. 2017).


Type species: Juxtiphoma eupyrena (Sacc.) Valenz.-Lopez, Crous, Stchigel, Guarro & J.F. Cano


Notes: Juxtiphoma is characterised by blackish, depressed conical, ostiolate pycnidia with hyaline, ovoid conidia (Saccardo 1879). Boerema et al. (2004) studied Juxtiphoma eupyrena, previously known as Phoma eupyrena and placed it in section Phoma. Aveskamp et al. (2010) regarded P. eupyrena closely related to Microsphaeropsis. Valenzuela-Lopez et al. (2018) moved P. eupyrena to the new genus Juxtiphoma based on phylogenetic analyses. Currently, Juxtiphoma is a well-supported monophyletic genus in Didymellaceae. Molecular markers available for Juxtiphoma are ITS, LSU, SSU, BTUB and RPB2.


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