During the surveys of air fungi in Beijing, China, a new ascomycetous black yeast-like species was isolated. Morphological and phylogenetical analyses of combined internal transcribed spacer (ITS) and the large ribosomal subunit (LSU) showed that it can be recognized as a new species of the genus Aureobasidium. Herein, Aureobasidium aerium sp. nov. is proposed and illustrated.

The species of Tubakia (Tubakiaceae, Diaporthales, Sordariomycetes) have often been reported as endophytes and pathogens on woody plants. During the investigation of Tubakia species from Fagaceae trees in China, 46 isolates were obtained from diseased leaves and seeds. The characterization of these isolates was based on the observation of morphological characters, the effect of temperature on mycelial growth rate, as well as the combined genes of ITS, tef1 and tub2. As a result, six species were identified: Tubakia americana, T. cyclobalanopsidis sp. nov., T. dryinoides, T. koreana, T. paradryinoides and T. quercicola sp. nov. Among these, T. koreana and T. paradryinoides were firstly discovered in China. Pathogenicity tests were conducted using the conidial suspension on young, excised leaves for these six species, which showed that they were mildly pathogenic to four Fagacece hosts: C. mollissima, Q. acutissima, Q. aliena var. acutiserrata and Q. variabilis.

Iris lactea is a wide ground cover plant of importance throughout courtyards, trees and roads. From May to September in 2020 and 2021, I. lactea planted in Beijing showed white to yellow spots with black conidiomata and could lead blight expanded down from the tip of leaves. In this study, ninety-six diseased leaves were collected from nineteen regions in Beijing, and a total of fifty-nine Colletotrichum isolates were