Jackrogersella L. Wendt, Kuhnert & M. Stadler, Mycol. Prog. (2017)
Saprobic on wood. Sexual morph: Stromata superﬁcial, effused-pulvinate or pulvinate to discoid, peltate, surface black or dull coloured, with constricted base, attached to substrate with narrow base, pruinose or polished, plane or with inconspicuous to very conspicuous ascomatal mounds, waxy or carbonaceous tissue immediately beneath surface and between ascomata, with KOH-extractable pigments, the tissue below the ascomata layer conspicuous to inconspicuous, dark brown to blackish. Ascomata sphaerical, obovoid or tubular, monostichous, with carbonaceous stromal layers surrounding individual ascomata. Ostioles papillate, conspicuous to inconspicuous, rarely surrounding by an inconspicuous disc. Asci 8-spored, cylindrical, stipitate, with distinct J+, apical ring bluing in Melzer’s reagent, discoid. Ascospores uniseriate, unicellular, ellipsoid-inequilateral, narrowly rounded, light- to darkcoloured, germ slit spore-length to much less than sporelength on the convex side, perispore indehiscent or dehiscent in 10% KOH, with a thickened area visible at the position of ca. 1/3 ascospore length on the same side as the germ slit, epispore smooth. Asexual morph: produced on young stromata, or in artiﬁcial culture. Conidiophores mononematous, usually macronematous, hyaline, smooth or roughened, with virgariella-like branching patterns (as deﬁned in Ju and Rogers 1996), with holoblastic conidiogenous pattern.
Type species: Jackrogersella multiformis L. Wendt, Kuhnert & M. Stadler, Mycol. Prog. (2017)
Notes: The genus was introduced by Wendt et al. (2017) to accommodate the species previously regarded as Annulohypoxylon that have papillate ostioles and the species lack prominent ostiolar disks. Jackrogersella comprises seven species (Wendt et al. 2017). Certain species (i. e. J. gombakensis and J. ilanensis) included in this genus by Wendt et al. (2017) have morphological differences when comparing to the type species, such as the presence of ostiolar disks. The genus can be differentiated from Annulohypoxylon by chemotaxonomy, speciﬁcally by the occurrence of the unique cohaerin/multiformin type azaphilones in species of Jackrogersella, which is considered as the metabolic marker (Wendt et al. 2017). In the phylogenetic analysis of this study species of Jackrogersella clustered close to Annulohypoxylon. We accept the placement of Jackrogersella in Hypoxylaceae based on the phylogeny and its morphological resemblance to well-established genera such as Annulohypoxylon and Hypoxylon.