Asexual morph: Conidiomata pycnidial, several pycnidia grouped together, globose, black, erumpent, exuding creamy to yellowish conidial droplets from ostioles. Conidiophores hyaline, septate, branched, cylindrical, straight to sinuous, 25.0–32.0 × 1.4–2.5 μm. Conidiogenous cells 10.5–20.7 × 1.4–2.0 μm, phialidic, cylindrical, swollen at base, tapering towards apex, slightly curved. Alpha conidia hyaline, smooth, aseptate, ellipsoidal, guttulate, apex subobtuse, base subtruncate, 7.5–10.0 × 1.8–3.0 µm (mean = 8.2 × 2.4 μm, n = 20). Beta conidia hyaline, aseptate, filiform, slightly curved, tapering towards base, 18.5–26.5 × 1.0–1.8 µm (mean = 24.3 × 1.4 μm, n = 20). Gamma conidia not observed. Sexual morph not observed.

Cultures incubated on PDA at 25 °C in darkness, growth rate 11.2–13.3 mm diam/day. Aerial mycelium white, cottony, feathery, abundant in center, sparse in margin, white on surface, reverse yellowish to tan.

China, Yunnan Province: Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, on diseased leaves of Persea americana (Lauraceae). 19 April 2019, S.T. Huang, HSAUP194.18, living culture SAUCC194.18.

Diaporthe arecae (CBS 161.64) was originally described as Subramanella arecae on fruit of Areca catechu in India (Srivastava et al. 1962) and placed in Diaporthe by Gomes et al. (2013). The Diaporthe isolate from fruits of Citrus sp. (CBS 535.75) in Suriname was also placed in D. arecae by Gomes et al. (2013). In the present study, strain (SAUCC194.18) from symptomatic leaves of Persea americana was congruent with D. arecae based on morphology and DNA sequences data (Fig. 1). We therefore consider the isolated strain as D. arecae.