| Summary: | Species of <i>Pseudoplagiostomataceae</i> were mainly introduced as endophytes, plant pathogens, or saprobes from various hosts. Based on multi-locus phylogenies from the internal transcribed spacers (ITS), the large subunit of nuclear ribosomal RNA gene (LSU), partial DNA-directed RNA polymerase II subunit two gene (<i>rpb2</i>), the partial translation elongation factor 1-alpha gene (<i>tef1α</i>), and the partial beta-tubulin gene (<i>tub2</i>), in conjunction with morphological characteristics, we describe three new species, viz. <i>Pseudoplagiostoma alsophilae</i> sp. nov., <i>P. bambusae</i> sp. nov., and <i>P. machili</i> sp. nov. Molecular clock analyses on the divergence times of <i>Pseudoplagiostomataceae</i> indicated that the conjoint ancestor of <i>Pseudoplagiostomataceae</i> and <i>Apoharknessiaceae</i> occurred in the Cretaceous period. and had a mean stem age of 104.1 Mya (95% HPD of 86.0–129.0 Mya, 1.0 PP), and most species emerged in the Paleogene and Neogene period. Historical biogeography was reconstructed for <i>Pseudoplagiostomataceae</i> by the RASP software with a S–DEC model, and suggested that Asia, specifically Southeast Asia, was probably the ancestral area.
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