Pleosporales » Pleosporales, genus incertae sedis

Xenolophium

Xenolophium Syd., in Stevens, Bulletin of the Bernice P. Bishop Museum, Honolulu, Hawaii 19: 96 (1925).

Index Fungorum number: IF 5818; Facesoffungi number: FoF 11843, 7 morphological species (Species Fungorum 2022), 3 species with molecular data.

Saprobic on wood. Sexual morph: Ascomata nearly superficial, scattered to gregarious, globose, large, with a conspicuous compressed papilla and large slit-like ostiole. Peridium carbonaceous. Hamathecium of dense, long trabeculate pseudo paraphyses, branching and anastomosing between and among asci. Asci 8-spored, clavate, long furcate pedicels. Ascospores fusoid to narrowly fusoid, light to dark brown, uniseptate, constricted at the septum. Asexual morph: Unknown (adapted from Zhang et al. 2012).

Type species: Xenolophium leve Syd.

Notes: Xenolophium morphologically resembles Ostropella and Schizostoma and was considered as a synonym of Ostropella (Müller & Arx 1962) as well as Lophiostoma (Chesters & Bell 1970). Huhndorf (1993) re-defined Xenolophium and treated X. leve as a synonym of Schizostoma applanata. Xenolophium differs from Ostropella in lacking an organized cell arrangement and triangular outline of melanization in the peridium (Huhndorf 1993, Zhang et al. 2012). Xenolophium is currently placed in Pleosporales genera incertae sedis and the familial rank is unknown. More species with DNA sequence data are needed to confirm the taxonomic placement of the genus. Molecular markers available for Xenolophium are LSU, SSU, RPB2 and TEF-1.

 

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