Pestalotiopsis bulbophylli S.F. Ran & Yong Wang bis, sp. nov., Index Fungorum number: IF XXX

Etymology: In reference to the host genus.

Colonies on PDA reaching 9 cm diam, after 10 days at 25 °C, edge regular, whitish. Reverse same colour. Saprobic on Bulbophyllum thouars. Sexual morph: Undetermined. Asexual morph: Conidiomata pycnidial, globose, solitary, black. Conidiophores 15−35.5 × 2−4.5 μm, cylindrical, hyaline to subhyaline, smooth-walled. Conidiogenous cells holoblastic, simple, integrated, determinate, hyaline. Conidia obovoid to fusiform, straight to slightly curved, with 4 transverse septa, 15−21.5 × 5.5−8 μm (x̄ = 17.5 × 7.0 μm, n = 30), constricted at the septa, smooth-walled; apical cell hyaline, obconic to cylindrical, 2.5−5.5 μm (x̄ = 3.5 μm, n = 30), with a single tubular apical appendage, arising from the apical crest, unbranched, 10.5−22 μm long; basal cell obconic to cylindrical, hyaline, 2.5−6 μm (x̄ = 3.5 μm, n = 30), a basal appendage filiform, unbranched, 5−13 μm long; three median cells doliiform to cylindrical, concolorous, brown, 11−14.5 μm (x̄ = 12 μm, n = 30).

Type: CHINA, Guangxi, Baise city, Yachang Orchid National Nature Reserve, on dead stem of Bulbophyllum thouars, 9 November 2015, Shuang-Fei Ran YC5534 (HGUP 7001, holotype), ex-type living culture GUCC 7001,
ITS: KX024706, LSU: KX024707, β-tubulin: KX673486.

FIG 1. Pestalotiopsis bulbophylli (HGUP 7001, holotype). a Host material. b Colony on PDA from above. c. Colony on PDA from below. d−e Vertical section of conidioma. f Conidiophores and conidia. g−h Conidia. Scale bars: d−e = 20 μm, f−h = 10 μm.