Phaeoacremonium W. Gams, Crous & M. J. Wingf.

Phaeoacremonium W. Gams, Crous & M. J. Wingf.

Notes.

Phaeoacremonium ( Togniniaceae Réblová, L. Mostert, W. Gams & Crous ) was introduced by Crous et al. (1996) with P. parasiticum (Ajello, Georg & C. J. K. Wang) W. Gams, Crous & M. J. Wingf. as the type species. In this genus, the asexual morph was recorded as Phaeoacremonium , and the sexual morph as Togninia Berl. , which was introduced by Berlese (1900), with the type species T. minima (Tul. & C. Tul.) Berl. ( Calabon et al. 2021; Phukhamsakda et al. 2022; Senanayake et al. 2023). Gramaje et al. (2015) synonymized Togninia under Phaeoacremonium , as it includes the majority of species, widely used by mycologists, and some Togninia species already have corresponding names in Phaeoacremonium ( Calabon et al. 2021, 2024; Senanayake et al. 2023). The sexual morph of Phaeoacremonium is characterized by black ascomata with 8 - spored asci, cylindrical, arising in acropetal succession, cylindrical-ellipsoidal to allantoid, hyaline, aseptate ascospores, and the asexual morph has hyaline to pigmented conidiophores, hyaline, cylindrical-ellipsoidal to allantoid conidia ( Shang et al. 2021; Phukhamsakda et al. 2022; Senanayake et al. 2023; Calabon et al. 2024). In this study, we introduce a new species, P. chiangmaiense , from macadamia in Thailand. In addition, this is the first report of a Phaeoacremonium species from Macadamia species.