Peroneutypa Berl., Icon. fung. (Abellini) 3(3-4): 80 (1902)
Xylariomycetidae, Xylariales, Diatrypaceae, Peroneutypa
Index Fungorum number: IF 3834; 28 morphological species (Species Fungorum 2020); 11 species with sequence data.
Endophytic or saprobic on plant substrates. Sexual morph: Stromata solitary to aggregated, immersed, becoming raised to erumpent by long ostiolar canals, circular to irregular in shape, generally multi-loculate, black, glabrous. Ascomata perithecial, immersed in stromatic tissue, black, globose to subglobose, with long ostiolar necks. Ostioles periphysate, cylindrical, black. Ascomatal wall thick, outer layer dark brown to brown, inner layer subhyaline. Asci 8-spored, unitunicate, hyaline, sessile to pedicellate, apex usually truncate. Ascospores allantoid, elongate, aseptate, straight to curved, hyaline or subhyaline to pale yellowish, smooth-walled. Asexual morph: Coelomycetous, forming pycnidia on PDA medium. Conidiomata superficial, solitary or aggregated, subconical, globose to subglobose, shiny, surface smooth, white, dark brown to black. Pycnidial wall made up of several layers of dark brown, compressed hyphae, arranged in a textura intricata. Conidiogenous cells holoblastic, cylindrical, straight or curved, apically distorted on conidial secession. Conidia lunate to filiform, curved, rarely straight, hyaline, apex blunt, base flattened (adapted from Luo et al. 2019).
Type species: Peroneutypa bellula (Desm.) Berl., Icon. fung. (Abellini) 3(3-4): 81 (1902)
Notes: Peroneutypa was introduced by Berlese (1902) to accommodate P. bellula, P. corniculata and P. heteracantha without designating the type species. Rappaz (1987) proposed P. bellula as the type species and synonymized Peroneutypa under Eutypella. However, based on characteristics and phylogenetic data of Acero et al. (2004), Peroneutypa was reinstated by Carmarán et al. (2006). The genus is characterised by valsoid stromata, with packed, long prominent necks, sessile to long pedicels, small asci with truncate apices and allantoid ascospores (Carmarán et al. 2006, 2014, Senwanna et al. 2017, Shang et al. 2017) (notes from Hyde et al. 2020).
Species illustrated in this entry:
Peroneutypa lignicola Z.L. Luo, K.D. Hyde & H.Y. Su