Chalaropsis pruni D. Hyeon Lee & S. E. Cho 2024, sp. nov.

Chalaropsis pruni D.Hyeon Lee & S.E. Cho, sp. nov. (Figure 2) MycoBank No. MB 854086 Etymology: The epithet refers to the host genus Prunus, from which the fungus was collected. Description: Conidiophores phialidic, cylindrical, hyaline, tapering toward apex, 3.8–4.2 μm at the tip and 8.9–10.8 μm at the base. Chlamydospores unicellular, globose, dark-brown, 18–21 × 19–23 μm. Conidia unicellular, cylindrical, hyaline, produced singly or in chains, 8.1–22.3 μm long × 3.9–5.3 μm wide. Culture characteristics: Colonies on MEA initially white, becoming dark green. Mycelium immersed and superficial. Hyphae smooth, septate. Optimal temperature for growth 25 °C reaching 75 mm in 14 days. Typus:Mt.293-1,Eoheul-ri,Seongsan-myeon,Gangneung-si,the Gangwon Province of South Korea (37°43'41.7"N 128°47'56.1"E), isolated from fresh wounds (less than one month-old) on Prunus serrulata var. pubescens. The holotype, KA24-0002, dried culture of CDH061, was deposited in the herbarium collection (KH) of Korea National Arboretum Korea. The ex-holotype culture (CDH061 = KACC 410708) was deposited in the culture collection (CDH) of the Chungnam National University and Korean Agricultural Culture Collection (KACC) of the National Academy of Agricultural Science for Type Cultures. Additional specimen examined: Mt. 293-1, Eoheul-ri, Seongsan-myeon, Gangneung-si, the Gangwon Province of South Korea (37°43'41.7"N 128°47'56.1"E), isolated from fresh wounds on P. serrulata var. pubescens, August 2022, D.H. Lee, culture CDH062. Habitat: Fresh wounds (less than one month-old) on P. serrulata var. pubescens trees. Known distribution: The Republic of Korea (Gangwon Province) Notes: Chalaropsis pruni is phylogenetically closely related to C. thielavioides. It can, however, be distinguished from that species by its slightly larger chlamydospores and smaller conidia, which are 9–19 μm long × 7.5–18 µm wide and 6.5–32 μm long × 2.5–6.5 µm wide, respectively (Nag Raj & Kendrick 1975).