Fuscostagonospora cytisi Jayasiri, Camporesi & K.D. Hyde, in Hyde et al., Fungal Diversity 87: 34 (2017)
Index Fungorum number: IF 552782; Facesofungi number: FoF 02898
Etymology: refers to the host Cytisus sp.
Holotype: MFLU 15-3607.
Saprobic on dead branch of Cytisus scoparius (L.) Link. Sexual morph: Ascomata 204–264 μm high, 243–290 μm wide, scattered or gregarious, immersed in substrate, black, subglobose to globose, occurring on black thin cells. Ostiole immersed to partially immersed. Peridium 17–26 μm thin, 6–8 layered, equally thick at the apex and base, comprising cells of textura angularis cells, hyaline, pale brown to dark brown. Hamathecium comprising numerous, 1.5–2 μm wide, septate, narrow, cellular pseudoparaphyses, in a gelatinous matrix, branched above the asci. Asci 81–108 × 9–12 μm (x̄ = 95 × 11 μm; n = 20), 8-spored, bitunicate, cylindrical, blunt apex, short pedicellate. Ascospores 15–17 × 6–8 μm (x̄ = 16 × 7.4 lm; n = 20), obliquely to irregularly uniseriate, hyaline, ellipsoid to obovoid, straight, thick-walled, 1-septate, constricted at the septum, guttulate, with mucilaginous sheath. Asexual morph: Undetermined.
Material examined: ITALY, Province of Arezzo, near Croce di Pratomagno, dead aerial branch of Cytisus scoparius (Fabaceae). 19 October 2015, E. Camporesi, IT 2651 (MFLU 15-3607, holotype; PDD, isotype), ex-type living cultures MFLUCC 16-0622, BCC.
Culture characteristics: Ascospores germinating on MEA within 24 h. Colonies growing on MEA, 2 cm diameter after 21 days at 18 °C, slow growing, circular, effuse, dense, dark brown, surface smooth, with entire to slightly undulate edge.
GenBank numbers: LSU: KY770978, SSU: KY770977, TEF1: KY770979.
Notes: Fuscostagonospora cytisi, differs from F. sasae in having broad, 1-septate ascospores and asci with a short pedicel and hence we establish a new species. Fuscostagonospora cytisi and F. sasae cluster together in a strongly supported monophyletic lineage and nested in between the Massarinaceae and Didymosphaeriaceae (Hyde et al. 2017). Hence, we establish a new family to accommodate these species (Hyde et al. 2017).