Didymozoum triseriale is found from the tropical south Pacific.
Original description: Didymia triserialis Philipps, 1899.
Locality: New Caledonia
Lectotype: BMNH 1900.6.26.2; Paralectotype: BMNH 1900.6.26.1, 1928,9,13.117.
Description from Tilbrook, 2006. (PDF file)