Amphisphaeria Ces. & De Not., Comm. Soc. crittog. Ital. 1(4): 223 (1863)

MycoBank number: MB 173; Index Fungorum number: IF 173; Facesoffungi number: FoF 02099;  88 morphological species (Species Fungorum 2020), 18 morphological species (Senanayake et al. 2019), 6 species with sequence data.

Type speciesAmphisphaeria umbrina (Fr.) De Not.

NotesAmphisphaeria was introduced by Cesati & De Notaris (1863). Wang et al. (2004) re-examined more than 170 type species described as Amphisphaeria and accepted 12 species. Senanayake et al. (2015) reviewed the phylogenetic status of the genus, which is sister to Lepteutypa (Jaklitsch et al. 2016b). Based on phylogenetic investigations, other six new species have been added: A. doidgeae (Marincowitz et al. 2008), A. sorbi (Liu et al. 2015), A. mangrovei (Phookamsak et al. 2019), A. flava, A. thailandica (Samarakoon et al. 2019a) and A. acericola (Senanayake et al. 2019) respectively. The sexual morph of A. acericola and asexual morph of A. sorbi are illustrated in this entry (Figs. 26, 27).

Figure 26 Amphisphaeria sorbi (ex-type culture MFLUCC 13-0721, redrawn from Liu et al. 2015). a, b Conidiophores and conidiogenous cells with attached conidia. c Conidia. Scale bars: a-c = 10 μm.

Figure 27 Amphisphaeria acericola (Material examined – ITALY, Province of Forlì-Cesena, Galeata, Strada San Zeno, on a branch of Acer campestre, 26 March 2014, E. Camporesi, IT 1779, MFLU 16-2479, holotype). a, b Ascomata on the substrate. c, d Cross-sections of ascoma. e Ostiole. f Peridium. g Paraphyses. h J+, apical ring. i-m Asci (m stained in Congo Red). n-r Ascospores. Scale bars: a, b = 500 µm, c, d = 200 µm, e = 50 µm, f, i-m = 20 µm, g = 10 µm, h, n-r = 5 µm.