| Summary: | <i>Aspergillus</i> subgenus <i>Nidulantes</i> includes species with emericella-like ascomata and asexual species. Subgenus <i>Nidulantes</i> is the second largest subgenus of <i>Aspergillus</i> and consists of nine sections. In this study, agricultural soils were sampled from 12 provinces and autonomous regions in China. Based on primary BLAST analyses, seven of 445 <i>Aspergillus</i> isolates showed low similarity with existing species. A polyphasic investigation, including phylogenetic analysis of partial ITS, β-tubulin, calmodulin, and RNA polymerase II second largest subunit genes, provided evidence that these isolates were distributed among four new species (<i>Aspergillus guangdongensis</i>, <i>A. guangxiensis</i>, <i>A. sichuanensis</i> and <i>A. tibetensis</i>) in sections <i>Aenei</i>, <i>Ochraceorosei,</i> and <i>Sparsi</i> of subgenus <i>Nidulantes</i>. Illustrated morphological descriptions are provided for each new taxon.
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