Key to freshwater Phaeoacremonium species:

1a. Asexual morph............................................................................................................................................................ P. philippinense

1b. Sexual morph......................................................................................................................................................................................2

2a. Ascomata without neck ............................................................................................................................................... P. thailandense

2b. Ascomata with neck ...........................................................................................................................................................................3

3a. Unreported asexual morph ............................................................................................................................................. P. aquaticum

3b. Hyphomycetous asexual morph .............................................................................................................................................. P. ovale