A new genus, Halorosellinia, is introduced to accommodate the lignicolous mangrove inhabitant Hypoxylon oceanicum. A detailed
illustrated account of the teleomorphic and anamorphic states is given. Halorosellinia oceanica comb. nov., is compared with
Stilbohypoxylon quisquiliarum and Nemania confluens (a reduced form of Nemania) and the reasons for introducing a new genus are
discussed. Data on the ecology and geographical distribution of H. oceanica are presented.