Submersispora variabilis W. Dong, H. Zhang & K.D. Hyde, sp. nov.

Index Fungorum number: IF557917; Facesoffungi num- ber: FoF08720; Fig. 67

Etymology: referring to variable shape of conidia

Holotype: MFLU 17-1719

Saprobic on decaying, submerged wood in freshwater. Sexual morph: Undetermined. Asexual morph: Colonies broadly punctiform, gregarious or scattered or solitary, raised, black. Mycelium mostly immersed in natural substratum, consisting of branched, septate, thin-walled, smooth, hyaline to pale brown hyphae. Conidiophores up to 230 µm long, 3 µm wide, semi-macronematous, mononematous, cylindrical, slender, unbranched, septate, slightly constricted at the septa, smooth, pale brown, thin-walled. Conidiogenous cells 5.2–6.4 × 5.5–6 µm (x̄ = 5.8 × 5.7 µm, n = 5), monoblastic, holoblas- tic, integrated, determinate, cuneiform, pale brown, smooth. Conidia 26.5–185.5 × 35–90 µm (x̄ = 96.5 × 65.7 µm, n = 30), acrogenous, solitary, dry, variable in shape, mostly subglo- bose, ellipsoidal, oblong, irregular, septate, muriform, slightly constricted at the septa, comprising large number of angular cells, hyaline to brown when young, dark black and invisible for septa when mature, smooth, thin-walled.

Culture characteristics: On PDA, colony circular, reach- ing 30 mm in 15 days at 25 °C, grey in the middle with dark brown margin from above, dark brown from below, surface rough, fluffy, with dense mycelium, dry, raised, edge entire.

Material examined: THAILAND, Chiang Mai Province, MRC, on submerged wood in a stream, 1 September 2017,

X.D. Yu, 2A (MFLU 17-1719, holotype), ex-type living culture MFLUCC 17-2360.

Fig. 67 Submersispora variabi- lis (MFLU 17-1719, holotype). a Colonies on submerged wood. b Conidiophores with conidia.

c Conidium, conidiogenous cell and conidiophore. dm Conidia. n Germinated conidium. o, p Colony on PDA (left-front, right-reverse). Scale bars: b, fn = 50 μm, ce = 20 μm