Hypocrella umbilicata Z. Q. Wang & Y. B. Wang 2026, sp. nov.

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Hypocrella umbilicata Z. Q. Wang & Y. B. Wang sp. nov. Fig. 4 Etymology. Named after the pulvinate stromata with a navel-like depression and notch at the center. Type. China • Yunnan Province, Pu’er City, Lianhuatang Village. 22°40'N, 100°32'E, alt. 984 m, on the underside of living leaves of dicotyledonous plants. 05 Aug. 2025, Zhiqin Wang (HKAS 154123, holotype). Description. Sexual morph: Stromata pulvinate, with a navel-like depression and notch at the center, 3.0– 3.4 mm in diam, yellow to pale brown, surrounded by a yellow hypothallus, surface rough. Perithecia immersed in the stromata, scattered, absent from the central depressed area, with ostioles slightly projecting, dozens of perithecia per mature stroma, flask-shaped, 201–344 × 115–156 μm. Asci cylindrical, 66–200 × 2.9–9.3 μm, with an apical cap measuring 2.1–3.0 × 1.4–2.1 μm. Ascospores whole, non-fragmenting, hyaline, multiseptate, smooth-walled, filiform to long-fusiform, 51–123 × 1.4–3.4 μm. Asexual morph: Undetermined. Habitat. On whiteflies (Aleyrodidae, Hemiptera) occurring on the underside of living leaves of dicotyledonous plants. Distribution. China, Yunnan Province, Pu’er City. Other material examined. China • Yunnan, Pu’er City, Lianhuatang Village. 22°40'N, 100°32'E, alt. 984 m, on the underside of living leaves of dicotyledonous plants. 05 Aug. 2025, Zhiqin Wang (HKAS 126115, HKAS 154124, paratype). Commentary. Phylogenetic analyses resolved the three samples of H. umbilicata as a distinct, well-supported clade, showing a close phylogenetic relationship to H. calendulina, H. limushanensis, H. cf. discoidea, and A. napoleonae (Fig. 1). Because of the lack of comprehensive morphological documentation for A. napoleonae and H. cf. discoidea, direct morphological comparisons with these taxa are currently limited. Morphologically, H. umbilicata is easily distinguished from the closely related H. calendulina and H. limushanensis by its pulvinate stromata with a navel-like depression and notch at the center, whereas the stromata of the latter two species lack this feature (Mongkolsamrit et al. 2009; Wang et al. 2025). Furthermore, H. calendulina differs in having vividly marigold-orange stromata, whereas those of H. umbilicata are yellow to pale brown. Hypocrella umbilicata also has smaller perithecia (201–344 × 115–156 μm vs. 380–500 × 170–220 μm in H. calendulina) (Mongkolsamrit et al. 2009).

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