Mucoharknessia Crous, R.M. Sánchez & Bianchin., 2015

Crous, Pedro W., Müller, Michael M., Sánchez, Romina M., Giordano, Lucrecia, Bianchinotti, M. Virginia, Anderson, Freda E. & Groenewald, Johannes Z., 2015, Resolving Tiarosporella spp. allied to Botryosphaeriaceae and Phacidiaceae, Phytotaxa 202 (2), pp. 73-93 : 86

Mucoharknessia Crous, R.M. Sánchez & Bianchin. , gen. nov. MycoBank MB811254

Etymology:— Muco , derived from the mucoid appendage, and Harknessia (resembling the genus).

Mucoharknessia resembles Harknessia ( Harknessiaceae , Diaporthales ), but is distinguished from that genus by having pycnidia that lack furfuraceous tissue surrounding its ostiole, and conidia that have a mucoid apical appendage.

Foliicolous. Conidiomata immersed, separate or aggregated, pycnidial, unilocular, globose to subglobose, blackish on leaves; ostiole subepidermal, circular to subcircular, opening onto the abaxial side of leaves by means of a longitudinal split in epidermis. Peridium arranged in two layers, the external stromatic, with brown cells of textura angularis; the internal conformed by flattened, hyaline cells, 10–15 μm thick. Conidiophores reduced to conidiogenous cells, lining the conidiomatal cavity. Conidiogenous cells lageniform to subcylindrical, smooth, covered in mucus, hyaline; proliferating several times percurrently at apex, with flared collarette visible. Conidia oval to ellipsoidal, appendaged, thick-walled, smooth to finely verruculose, lacking striations, brown; apical appendage extracellular (Type B, sensu Nag Raj 1993), mucilaginous, irregular, smooth, hyaline ; basal appendage tubular, thin walled, smooth, hyaline, often collapsing. Microconidia not seen.

Type species:— Mucoharknessia cortaderiae Crous, R.M. Sánchez & Bianchin.