Angustimassarina camporesii D. Pem & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 24 (2020)
Index Fungorum number: IF556796; Facesofungi number: FoF 06465
Etymology: The epithet honours Mr. Erio Camporesi who collected this fungus.
Holotype: MFLU 18–0057
Saprobic on dead aerial stem of Galium sp. Sexual morph: Ascomata 130–240 × 130–190 μm (x̄ = 177.8 × 170.7 µm, n = 20), semi-immersed to immersed with fat at the base, solitary or in small groups, globose to subglobose, visible as black dots on the host surface, conspicuous at the surface, ostiolate, papillate, black. Ostiole crest-like, papillate, immersed in ascomata, with a pore-like opening. Peridium 15–21 µm wide, thin comprised of dark brown to pale brown 3–5 layer of cells of textura angularis. Hamathecium comprising 1–2 µm wide, numerous, septate, hyaline, smooth, pseudoparaphyses, attached to the base, longer than asci. Asci 62–88 × 10–13 μm (x̄ = 77.1 × 11.2 µm, n = 20), 8-spored, bitunicate, fissitunicate, cylindric-clavate, slightly curved, long with a club-shaped pedicel, with apex rounded with a minute ocular chamber, smooth-walled. Ascospores 15–18 × 4–5 μm (x̄ = 17.1 × 4.5 µm, n = 20), overlapping 2–3-seriate at the centre and apex,1-seriate at the base, fusiform, hyaline, 1-septate at the centre, with 4–5 large guttules, enlarged cell near the central septum, constricted at the septum, conical at both ends, smooth-walled, surrounded by a mucilaginous sheath. Asexual morph: Undetermined.
Material examined: ITALY, Province of Forlì-Cesena [FC], Borgo Paglia – Cesena, on dead aerial stem of Galium sp. (Rubiaceae), 26 March 2018, E. Camporesi, IT 3603 (MFLU 18-0057, holotype).
GenBank Numbers: ITS: MN244197, LSU: MN244167, SSU: MN244173, TEF1-α: MN593307
Note: Our new collection is morphologically and phylogenetically related to Angustimassarina premilcurensis Tibpromma, Camporesi & K.D. Hyde, but differs in having smaller ascomata (138–241 × 138–190 μm versus 231–238 × 290–311 μm) and smaller ascospores (15–18 × 4–5 μm versus 19–23 × 4–7 μm). A comparison of ITS and TEF1-α nucleotide shows 7.95% and 2.5% differences between A. camporesii and A. premilcurensis. We, therefore, introduce A. camporesii as a new species in Angustimassarina.