Pleosporales » Didymosphaeriaceae

Xenocamarosporium

Xenocamarosporium Crous & M.J. Wingf., in Crous et al., Persoonia 34: 185 (2015).

 Index Fungorum number: IF 812422; Facesoffungi number: FoF 01730, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprotrophic on decaying branch. Sexual morph: Ascomata immersed, subglobose, scattered, solitary, uniloculate, with short ostiole penetrating through host surface and becoming brown to black spots on the substrate. Peridium unequal thickness, composed of 3–4 layers of hyaline to light brown, pseudoparenchymatous cells of textura angularis. Hamathecium sparse, filamentous, numerous, with a distinct constricted septum. Asci bitunicate, 8-spored, cylindrical to cylindric-clavate, with short or absent pedicellate, apically rounded with an indistinct ocular chamber. Ascospores uniseriate or overlapping, hyaline to brown, cylindrical, narrower and longer at the lower cell, 2–5-septate, often enlarged at the fourth cell, conical at the top (adapted from Lu et al. 2022). Asexual morph: Conidiomata separate, pycnidial, brown, globose. Conidiomatal wall consisting of 2–3 layers of brown cells of textura angularis. Conidiogenous cells lining the inner conidiomatal cavity, ampulliform, hyaline, smooth, phialidic with periclinal thickening, rarely with percurrent proliferation at apex. Conidia ellipsoidal to subcylindrical, with obtuse apex and obtusely rounded to truncate base, initially hyaline, smooth, becoming golden-brown and verruculose, septate, thick-walled (adapted from Crous et al. 2015).

Type species: Xenocamarosporium acaciae Crous & M.J. Wingf.

Notes: Xenocamarosporium is characterised by globose conidiomata, phialidic conidiogenous cells, ellipsoidal to subcylindrical conidia. Xenocamarosporium differs from similar genera such as Paracamarosporium and Pseudocamarosporium in conidial septation, conidiogenesis, presence/absence of paraphyses and microconidia. Xenocamarosporium is a well-supported and distinct genus in Didymosphaeriaceae. Molecular markers available for Xenocamarosporium are ITS, LSU, SSU and TEF-1.

 

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