Dothideomycetes families incertae sedis » Dysrhynchisceae

Dysrhynchis

Dysrhynchis Clem., Gen. fung. (Minneapolis): 32 (1909).

 Index Fungorum number: IF 1728; Facesoffungi number: FoF 06394, 4 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on dead leaves. Sexual morph: Ascomata superficial, globose to subglobose, dark brown, solitary, aggregated, pore central, with a protruding synnematous neck, comprised of tightly compacted hyphae, sparse superficial mycelium with hyphopodia, brown to dark brown, partially immersed mycelia, lacking setae, lacking pseudoparaphyses. Peridium membranous, comprising brown cells of textura angularis. Asci 8-spored, bitunicate, broadly obclavate to ovoid, sessile, apically thickened. Ascospores multi-seriate, conglobate, ellipsoidal, clavate to obpyriform, upper cell wider, septate, hyaline to light brown. Asexual morph: hyphomycetous, with synnemata. Conidiophores and conidiogenous cells were not observed. Conidia cylindrical oblong to fusiform, multi-septate, constricted at the septa, brown, smooth-walled (adapted from Boonmee et al. 2017).

Type species: Dysrhynchis pulchella(Sacc.) Clem.

Notes: Dysrhynchis is characterised by superficial, globose to subglobose ascomata, broadly obclavate to ovoid, sessile, apically thickened asci and conglobate, ellipsoidal, clavate to obpyriform ascospores. Hansford (1946) re-studied the type species H. pulchellus Sacc. (an earlier name of Dysrhynchis pulchella (Sacc.) Clem.) and suggested that this fungus is doubtful, and needs recollection to have a better understanding of its taxonomic placement. Müller and Arx (1962) synonymized several species under Dysrhynchis, namely Balladyna amazonica Höhn., B. uncinata Syd. & P. Syd., Diatrypella palmicola Syd., Meliola oligotricha Mont., Pisomyxa amomi Berk. & Broome and Rizalia confusa Doidge, and transferred the genus to Perisporiopsidaceae. Boonmee et al. (2017) studied the holotype specimen of D. pulchella from PAD and excluded Dysrhynchis from Perisporiopsidaceae based on morphology. Boonmee et al. (2017) introduced a new family Dysrhynchisceae to accommodate Dysrhynchis. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the systematic position of Dysrhynchis.

 

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