Pseudoplagiostoma dipterocarpicola sp. nov. is described herein on the basis material collected from twigs and fruits of Dipterocarpus sp. from Chiang Mai, Thailand. Phylogenetic analyses based on ITS, LSU, tef1-α and tub2 DNA sequence data revealed this new species with a distinct asexual morph belongs to the family Pseudoplagiostomataceae. Pseudoplagiostoma dipterocarpicola is closely related to P. mangiferae but differs in the thick wall present at near the base of the conidiomata, with two types of conidiogenous cells, these ranging from cylindrical with an elongated slimy neck to ampulliform and having a wider base, and lacking paraphyses. The morphology of this new species is described and illustrated.