Parathyridaria robiniae

Parathyridaria robiniae Mapook, Camporesi & K.D. Hyde, in Tibpromma et al., Fungal Diversity 83: 52 (2017)

Index Fungorum number: IF 552776; Facesofungi number: FoF 2794

Etymology: Name reflects the host genus Robinia.

Holotype: MFLU 17-0015

Saprobic on a dead branch of Robinia pseudoacacia L. Sexual morph: Ascomata 450–470 μm high × 255–270 μm diam. (x̄ = 455 × 260 μm, n = 5), semi-immersed to immersed, scattered, coriaceous, in groups, ovoid to obpyriform, reddish-brown to brown, ostiole central. Peridium 10–25 μm wide, comprising light brown to hyaline cells of textura angularis. Hamathecium comprising 0.5–1.5 μm wide, cylindrical to filiform, septate, branched, pseudoparaphyses. Asci 105–115 × 10–15 μm (x̄ = 110 × 11.5 μm, n = 10), 8-spored, bitunicate, cylindric-clavate, pedicellate, apically rounded with a small ocular chamber. Ascospores 15–20 × 4–7 μm (x̄ = 18.5 × 5 μm, n = 15), overlapping 1–2-seriate, hyaline, broadly fusiform to inequilateral, 1-septate, constricted at the septa, widest at the centre and tapering towards the narrow ends, smooth-walled, with mucilaginous sheath. Asexual morph: Undetermined.

Material examined: ITALY, Forlı`-Cesena Province, Collina di Pondo—Santa Sofia, on dead branch of Robinia pseudacacia (Fabaceae), 22 September 2014, E. Camporesi (MFLU 17-0015, holotype), ex-type living culture MFLUCC 14-1119 (isotype in HKAS, under the code of HKAS).

GenBank Numbers LSU:KY511141, ITS:KY511142, TEF1:KY549682.

Notes: Phylogenetic analysis indicates that our collection belongs to the family Thyridariaceae and P. robiniae groups together with members of Parathyridaria a genus that was introduced by Jaklitsch and Voglmayr (2016). The phylogeny also indicates that P. robiniae lies in an independent terminal taxon nested between P. percutanea and P. ramulicola and therefore can be considered as a new species. Parathyridaria robiniae is also distinct in having 1-septate ascospores surrounded by a hyaline gelatinous sheath (Tibpromma et al. 2017).