Xenodidymella camporesii D. Pem, Doilom & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 45 (2020)
Index Fungorum number: IF557076; Facesofungi number: FoF 06467
Etymology: The epithet honours Mr Erio Camporesi who collected this fungus.
Holotype: MFLU 17–1082
Saprobic on dead aerial stem of Dipsacus sp. Sexual morph: Ascomata 185–308 μm high, 185–330 μm wide, pseudothecial, separate or gregarious, or scattered, immersed to semi-immersed, dark brown to black, with central ostiole. Peridium 25–33 μm wide, comprising 1–2 layers of cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci 55–85 × 9–13 μm (x̄ = 66.6 × 12.7 μm, n = 20), 8-spored, bitunicate, fissitunicate, cylindric-clavate to clavate, shortpedicellate or apedicellate, apically rounded, with an ocular chamber. Ascospores 15–18 × 5–6 μm (x̄ = 14.5 × 5.6 μm, n = 20), overlapping 1–2-seriate, hyaline, ovoid to ellipsoidal, asymmetrical, upper cells wider than lower cells, 1-septate, slightly constricted at the septum, conical at both ends, smooth-walled. Asexual morph: Undetermined.
Culture characteristics: Colonies on MEA, 35–45 mm diam. after 7 days at 16 °C, margin regular, aerial mycelia white and woolly, greenish olivaceous, floccose; reverse dark brown, saffron near the margin.
Material examined: ITALY, Province of Forlì-Cesena [FC], near Verghereto, on dead aerial stem of Dipsacus sp. (Scrophulariaceae), 5 June 2017, E. Camporesi, IT3374 (MFLU 17–1082, holotype), ex-type living culture, MFLUCC 17–2309.
GenBank Numbers: ITS: MN244198; LSU: MN244168; SSU: MN244174; TUB2: MN871955.
Note: Our strain MFLUCC 17–2309 has a close phylogenetic affinity to Xenodidymella applanata (CBS 205.63) in our phylogeny analyses. Morphologically, X. camporesii differs from X. applanata in having longer asci (55–85 × 9–13 μm versus 50–60 × 10.5–14.5 μm) and longer ascospores (15–18 × 5–6 μm versus 11.5–15.5 × 5.5–7.5 μm). Comparison of TUB2 nucleotides of X. applanata and X. camporesii reveals 24 (10.43%) nucleotide differences. We, therefore, introduce X. camporesii as a new species.