Iodosphaeria jinghongensis L.S. Dissan., J.C. Kang & K.D. Hyde, sp. nov.

Dissanayake, Lakmali S., Marasinghe, Diana S., Samarakoon, Milan C., Maharachchikumbura, Sajeewa S. N., Mortimer, Peter E., Hyde, Kevin D., Kuo, Chang-Hsin & Kang, Ji-Chuan, 2022, Three new species of Iodosphaeria (Xylariomycetidae): I. chiayiensis, I. jinghongensis and I. thailandica, MycoKeys 86, pp. 1-17 : 1

Iodosphaeria jinghongensis L.S. Dissan., J.C. Kang & K.D. Hyde, sp. nov.

Figure 3

Etymology.

The specific epithet Iodosphaeria jinghongensis refers to the city name where the fungus was collected.

Holotype.

HKAS 115761.

Description.

Saprobic on dead twigs of an unidentified host. Sexual morph: Undetermined. Asexual morph: Colonies on natural substrate effuse, punctiform, scattered, blackish brown, mycelium mostly superficial, non-branched, hyaline, smooth hyphae. Conidiophores micronematous, smooth, flexuous, pale brown. Conidia ceratosporium-like, arising from aerial hyphae, solitary, dry, composed of a central cell and 2-3 arms. Arms 70-93 × 9-14 μm (x̅ = 79.8 × 12.1 μm, n = 20), wide at the tip 5-8 μm (x̅ = 6.9 μm), radiating from the centrally located attachment point, multi-septate (9-10), each septum with a central pore, brown, often with a sub-globose to conical cell at the point of attachment, dehiscence scar circular 3-4 μm diam. (x̅ = 3.5 μm).

Material examined.

China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Jinghong City, Jinghaxiang (21°780617'N, 101°056122'E), on a dead twig of undetermined species, 19 December 2019, D.N. Wanasinghe, DW060 (HKAS 115761, holotype) .

Notes.

Iodosphaeria jinghongensis is similar to I. ripogoni in having septate, brown, subglobose to conical conidia with 2-3 arms (Figure 4 ; Samuels et al. 1987). However, I. jinghongensis differs from I. ripogoni in having smaller arms (70-93 × 9-14 μm vs 95-120 × 14-16 μm). Iodosphaeria ripogoni was collected from the stem of Ripogonum scandens from New Zealand, and I. jinghongensis was collected from twigs of undetermined species from China.

Figures

Figure 3. Iodosphaeria jinghongensis (HKAS 115761, holotype) a, b colonies on the host surface c-f conidia, conidiogenous cells and conidiophores (black arrow shows hyphae, red arrow shows conidiophore). Scale bars: 20 μm (c-f).

Figure 4. Asexual morph of Iodosphaeria ripogoni (ceratosporium-like conidia). Redrawn from: Samuels et al. (1987). Scale bar: 20 μm.