Botryosphaeria quercus Wijayaw., A.J.L. Phillips, Camporesi & K.D. Hyde, in Wijayawardene et al., Fungal Diversity: 10.1007/s13225-016-0360-2,  (2016)
Index Fungorum number: IF 551550; Facesofungi number: FoF 01442
Etymology: Named after the host genus.
Holotype: MFLU 15-3444
Endophytic or saprobic on dead leaves of Quercus sp. Sexual morph: Undetermined. Asexual morph: Conidiomata 160–200 μm diam., 170–220 μm high, pycnidial, immersed, erumpent at maturity, gregarious to solitary, dark brown to black, unilocular. Ostiole papillate, central. Conidiomata wall outer layer thick, comprising of dark brown cells of textura angularis, inner layer thin, hyaline to subhyaline. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 10–35 × 4–6 μm, holoblastic, annellidic, simple, determinate, hyaline, doliiform to cylindrical. Conidia 10–24 × 6–10 μm (x̄ = 13.54 × 7.2 μm, n = 20), pyriformor cylindrical, truncate base, globose, muriform, with 1–5 transverse septa, 2–3 longitudinal septa, and with 1–2 oblique septa, constricted at the septa, brown, smooth-walled.
Culture characteristics: On PDA, slow growing, attaining 20 mm in 7 days at 18 °C, with thin mycelium, margin uneven, no zonate, yellowish brown from above, greyish white from below.
Material examined: Italy, Forlì-Cesena [FC] Province, Polenta - Bertinoro, dead and land leaf of Quercus sp. (Fagaceae), 30 December 2013, Erio Camporesi, IT 1615 (MFLU 15-3444, holotype); (HKAS92555, isotype), extype living cultures MFLUCC 14–0459, GUCC IT-1615
Notes: Farr and Rossman (2016) reported Dichomera saubinetii (conidial dimensions 11–13 × 7–10μm fide Sutton 1980) from Quercus sp. However, our collection has longer conidia than D. saubinetii. Moreover, our new collection and the type species of Dichomera, D. saubinetii (CBS 990.70) group in Botryosphaeria sensu stricto. Hence our new collection is introduced as a new species in Botryosphaeria (Wijayawardene et al. 2016).