Lunatiannulus Daranagama, Camporesi & K.D. Hyde, gen. nov., Indexfungorum number: IF809519

Etymology: In reference to the crescent-shaped, apical apparatus of ascus.

Saprobic on stems. Sexual morph: Ascomata semi-immersed, visible as blackened, slightly raised areas, with diffused margins, shiny, black, rarely solitary and usually aggregated in clusters, abundant on host surface, covering more than 1/3 of the surface, in cross section subglobose, ostiolar canal present, comprising host cells and fungal hyphae. Peridium comprising two cell layers of compressed cells, outwardly comprising dark brown cells of textura angularis and inwardly comprising hyaline cells of textura porrecta. Paraphyses 4.5 µm diam., as long as asci, few, filamentous, aseptate. Asci 8-spored, rarely 4-spored, unitunicate, cylindrical-clavate, pedicellate, with a crescent-shaped, apical apparatus, not bluing in Melzer’s reagent. Ascospores multiseriate or irregularly arranged in asci, light brown, fusiform, smooth-walled, ascospores always aggregated at the apex of asci. Asexual morph: libertella-like (as defined by Ju and Rogers, 1996)

Type species: Lunatiannulus irregularis Daranagama, Camporesi & K.D. Hyde 2015

Notes: The new genus Lunatiannulus is introduced in Xylariaceae based on its morphological differences with Anthostomella, Appendixia, Barrmaelia, and Spirodecospora. Anthostomella differs from Lunatiannulus as it has ascomata with a well-developed clypeus, cylindrical asci with an apical apparatus, ellipsoidal ascospores with germ slits and hyaline appendages or dwarf cells. Appendixia has ascomata with a well-developed clypeus filled with host cells and dark fungal hyphae, clavate asci with a cylindrical, J+, apical apparatus, and ellipsoidal ascospores with two, long, hyaline, polar appendages (Lu and Hyde, 2000b). Unlike Lunatiannulus, Barrmaelia has deeply immersed ascomata and contains an entostroma spreading along the cuticle, that is thicker around the ostioles (Rappaz, 1995). Spirodecospora differs from the new genus as its ascomata have a high ostiolar canal, cylindrical asci with wedged-shaped, J+, apical apparatus and larger and broadly ellipsoid ascospores with numerous, spirally arranged, verrucose ornamentations (Lu et al. 1998). In the phylogenetic tree, Lunatiannulus irregulata is placed in xylarioid Xylariaceae as a separate clade, but is close to Euepixylon. 

 

Species

    • Lunatiannulus irregularis