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.