Brunneiperidium Daranagama, Camporesi & K.D. Hyde, gen. nov., Indexfungorum number: IF809521
Etymology: In reference to the dark brown outer cell layers lined with yellowish-brown cells in peridium.
Saprobic on stems. Sexual morph: Ascomata semi-immersed, visible as black, conical areas, immersed areas, dark brown, solitary with black, central, ostiolar canal. Peridium composed of several compressed layers, outwardly comprising thick-walled, dark brown cells of textura angularis, lined with loosely arranged, yellowish-brown cells of textura irregularis and inwardly comprising thin–walled hyaline cells of textura irregularis. Paraphyses 4-5 µm diam., numerous, septate. Asci 8-spored, unitunicate, cylindrical, pedicellate, with a discoid, J+, apical apparatus. Ascospores uniseriate, ellipsoidal, brown, unicellular, mucilaginous sheath present, germ slit present or absent, if present straight and slightly curved at the edges, less than spore length. Asexual morph: Conidiophores simple, hyaline, sometimes dichotomously branched. Conidiogenous cells terminal, single, cylindrical. Conidia hyaline, globose, with thin mucilaginous sheath.
Type species: Brunneiperidium gracilentum Daranagama, Camporesi & K.D. Hyde
Notes: Brunneiperidium shares common ascomatal features with Anthostomella. However, the species in Brunneiperidium has superficial, conical ascomata and dark brown outer cell layers together with yellowish-brown, cell layers lining outside the peridium, which is not reported for Anthostomella sensu stricto. The asci of Brunneiperidium are slender and cylindrical than that of Anthostomella (Lu and Hyde, 2000b). The genus also has morphological similarities to Nipicola, but the latter has been recorded from marine habitats (Hyde and Taylor 1996). Nipicola has depressed globose–subglobose perithecia, a J-, apical apparatus and lunate ascospores that are surrounded by a layered, mucilaginous sheath (Hyde and Taylor 1996). In contrast, Brunneiperidium has globose ascomata with yellow outermost layers, a J+, discoid, apical apparatus and ascospores with or without broad mucilaginous sheath. Brunneiperidium gracilentum has a slightly curved germ slit at both ends, which are reportedly absent in Nipicola (Hyde and Taylor 1996). The asexual morph characteristics are unique for this genus with dichotomously branched, simple, hyaline conidiophores and hyaline, globose conidia, with a thin sheath. In the phylogenetic tree Brunneiperidium clusters as a new lineage with high bootstrap support inside a clade comprising Xylaria species.