Curvularia chiangraiensis Yasanthika & K.D. Hyde, sp. nov.

MycoBank number: MB; Index Fungorum number: IF; Facesoffungi number: FoF 12886 Figure 3

Etymology – The specific epithet “chiangraiensis” refers to the locality Chiang Rai Province (Thailand), where the holotype was collected.

Holotype –XXXXX

Asexual Morph: Conidiophores 50–150 × 2–7 μm (x̅ = 117 × 4 μm, n = 20), simple, unbranched, septate, hyaline to brown, micro- to semi-macro-nematous, sometimes geniculate towards upper region. Conidiogenous cells 7–11 × 3–7 (x̅ = 9 × 5 μm, n = 20), polytretic, terminal or intercalary, sometimes proliferating sympodially, cylindrical to subcylindrical, smooth to verruculose. Conidia 12–20 × 6–12 μm (x̅ = 17 × 9 μm, n = 30), sublunate to ellipsoid or obovoid, curved, sub hyaline to pale brown when immature, 1–2 distoseptate when immature later becoming 2–3 euseptate when mature, latter becoming pale brown to brown, smooth to verruculose, swollen when mature, with third cell from the base becoming prominent, partially enlarged along the horizontal axis, asymmetrically curved, darker, verrculose than apical and basal septa, with apical and basal septa symmetrical, hila inconspicuous to slightly conspicuous, slightly thickened 2–3 μm (x̅ = 2.5 μm) wide. Sexual morph: Undetermined.

Culture characteristics: Colonies on PDA at 25 ℃ raised, filamentous at margin, with sparse aerial mycelia, greyish brown to black, pale brown concentric rings, approximately 3.5 cm diam. at 7 days, reverse black. Hyphae 3–5 μm (x̅ = 4 μm) wide, branched, septate, hyaline to pale brown when immature and later becoming brown, septate hyphae.

Material examined: Thailand, Chiang Rai, 20.0478N, 99.7619E, 863m, on forest soil, 23 September 2019. E. Yasanthika (MFLU**, holotype); ex-type living culture MFLUCC 22-0091)

GenBank Accession No

Figure 3 Curvularia chiangraiensis (MFLUCC 22-0091, holotype). a Colony from above (on PDA). b Colony from below (on PDA). c Sporulated colony with conidial attachments on the mycelium. d. Immature hyphae. e Mature melanized hyphae. f–k conidiogenesis. l–p Conidia. Scale bars: g = 25 μm, d–f, h–l = 20 μm, g, m–p= 10 μm.