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Endophytic fungi isolated from medicinal ferns serve as significant natural resources for drug precursors or bioactive metabolites. During our survey on the diversity of endophytic fungi from <i>Dicranopteris</i> species (a genus of medicinal ferns) in Guizhou, <i>Apoiospora</i> was observed as a dominant fungal group. In this study, seven <i>Apiospora</i> strains, representing four new species, were obtained from the healthy plant tissues of three <i>Dicranopteris</i> species—<i>D</i>. <i>ampla</i>, <i>D</i>. <i>linearis,</i> and <i>D</i>. <i>pedata</i>. The four new species, namely <i>Apiospora aseptata</i>, <i>A</i>. <i>dematiacea</i>, <i>A</i>. <i>dicranopteridis,</i> and <i>A</i>. <i>globosa</i>, were described in detail with color photographs and subjected to phylogenetic analyses using combined LSU, ITS, TEF1-α, and TUB2 sequence data. This study also documented three new hosts for <i>Apiospora</i> species.