Montagnula camporesii Phukhams., Camporesi. & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 51 (2020)
Index Fungorum number: IF556760; Facesofungi number: FoF 06343
Etymology: The species epithet is honouring Erio Camporesi.
Holotype: MFLU 16-2290
Saprobic on dead stems of Dipsacus L. Sexual morph: Ascomata 200–250 × 300–350 μm (x̄ = 220 × 330 μm, n = 5), covered by host peridium, superficial on the cortex of host, superficial, solitary, scattered, uni-loculate, subglobose to depressed globose, flatten base, light brown to brown, smooth-walled, papillate. Ostiole central, 60 × 150 μm, brown to light brown, papillate, opened pore, ostiolate filled with periphyses. Peridium 13–40 μm wide, thin, uniform, comprising of 4–6 layers of light brown to brown cells of textura angularis, inner layers comprising thin, hyaline cells. Hamathecium of dense, 1.5–3.0 μm wide (x̄ = 2.5 μm, n = 50), filiform branches, anastomosing above asci, reaching the ostiole part, transverse septate, cellular pseudoparaphyses. Asci 80–120 × 10–15 μm (x̄ = 95 × 15 μm, n = 20), 8-spored, bitunicate, fisitunicate, thick-walled, clavate, apically rounded, with long, furcated pedicel, ocular chamber clearly visible when immature. Ascospores 18–25 × 5–8 μm (x̄ = 20 × 6.5 μm, n = 50), 2-seriate, partial overlapping, hyaline when immature, reddish brown to brown at maturity, cell above median septum slightly wider than below, tapering towards the ends, slightly acute at both ends, with (1–)3 transversely septa, constricted at the septa, indentation present, without mucilaginous sheath. Asexual morph: Undetermined.
Culture characteristics: Colonies on MEA, reaching 30 mm diam. after 4 weeks of incubation at 16 °C. Culture above cream with orange-brown at the edge, medium dense mycelium, colonies circular, flat, umbonate, dull, covered with white aerial mycelium; reverse dark brown, dense, irregular, fimbriate margin.
Material examined: ITALY, Province of Forlì-Cesena [FC], Riofreddo-Bagno di Romagna, on dead aerial stem of Dipsacus sp. (Caprifoliaceae), 5 August 2016, E. Camporesi, IT 3059 (MFLU 16-2290, holotype), ex-type living culture, MFLUCC 16-1369.
GenBank Numbers: ITS: MN401746; LSU: MN401742; SSU: MN401744; RPB2: MN397909, TEF1-α = MN397908.
Note: In multi-gene phylogenetic analysis, Montagnula camporesii strain (MFLUCC 16-1369) forms a close relationship with M. bellevaliae (MFLUCC 14-0924), M. cirsii (MFLUCC 13-0680) and M. scabiosae (MFLUCC 14-0954) strains with strong statistical support (87% ML, 0.99 BYPP). The Montagnula species in this clade are morphologically similar in having uniform peridium walls, reddish brown, broad fusiform ascospores, with (1–)3 transverse septa (Hongsanan et al. 2015; Hyde et al. 2016). Montagnula camporesii is reported from Dipsacus sp. and can be distinguished by its superficial ascomata located on the host surface and different sizes of asci. Montagnula camporesii has depressed globose ascomata with rather short pedicellate.