Stagonosporopsis centaureae Tennakoon, Camporesi & K.D. Hyde, in Hyde et al., Fungal Diversity 80: 43 (2016)
Index Fungorum number: IF 552261; Facesofungi number: FoF 02397
Etymology: Name reflects the host genus Centaurea, from which the species was collected.
Holotype: MFLU 16-1365.
Saprobic on dead stem of Centaurea cyanus. Sexual morph: Ascomata 110–120 μm high 120–130 μm diam., solitary, scattered, partly immersed to superficial, raised, dark brown to black, globose to subglobose, glabrous, uniloculate, with centrally located ostiole with minute papilla. Peridium 22–27 μm wide, thin-walled, with unequal thickness, composed of 4–5 layers of dark brown to black pseudoparenchymatous cells, arranged in textura angularis to textura prismatica. Hamathecium composed of numerous, 2–2.5 μm wide, filamentous, distinctly septate, cellular pseudoparaphyses, non-constricted at the septum, anastomosing at the apex, embedded in a hyaline gelatinous matrix. Asci 35–48 × 7.2–8.2 μm (x̄ = 42.5 × 8.1 μm, n = 30), 8-spored, bitunicate, fissitunicate, cylindrical or clavate, short pedicellate, with furcate pedicel, apically rounded with an indistinct ocular chamber. Ascospores 13–15 × 3–5 μm (x̄ = 14.3 × 4.3 μm, n = 30), overlapping, uni- to bi-seriate, hyaline, ellipsoidal to clavate or fusiform with rounded ends, 1-septate, slightly constricted at the septum, echinulate, straight to slightly curved. Asexual morph: Undetermined.
Culture characteristics: Colonies on PDA reaching 25–30 mm diam. after 8 days at 20–25 °C, colonies medium sparse, circular, flat, slightly rough surface with entire edge, well defined margin, cottony to fairly fluffy with sparse mycelium; from above: dark brown to yellowish at the margin, dark brown to black at the centre; from below: dark brown to yellowish-brown at the margin, dark brown at the centre; mycelium light brown to yellowish with tufting; not producing pigments in PDA medium.
Material examined: ITALY, Province of Arezzo [AR], near Quota, on dead stem of Centaurea cyanus (Asteraceae), 24 June 2015, E. Camporesi, IT 2548 (MFLU 16-1365 holotype; HKAS 93705 isotype), ex-type living cultures, MFLUCC 16-0787, KUMCC 15-0559.
Notes: Stagonosporopsis centaureae clusters with Stagonosporopsis trachelii with high support (93 % ML, 0.99 BYPP) in the study by Hyde et al. (2016). It can be easily distinguished from S. trachelii which has smaller ascomata (60–80 lm diam.) and smaller ascospores (4–6 × 1.5–2.5 lm). (Hyde et al. 2016).