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Zenodo
2026
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| Online adgang: | https://doi.org/10.5281/zenodo.19092649 |
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- <p><i>Biscogniauxia xishuangbannaensis</i> G. C Ren & Wanas. sp. nov.</p><p>Fig. 17</p><p><b>Etymology.</b></p><p>The specific epithet “ <i>xishuangbannaensis</i> ” reflects xishuangbanna where the holotype was collected.</p><p><b>Holotype.</b></p><p>HKAS 122774.</p><p><b>Description.</b></p><p><i>Saprobic</i> on dead woody twigs. <b>Sexual morph: <i>Stromata</i></b> 3–18 × 2–7 mm, superficial, aggregated, applanate, cover the wood surface, dull brown to black, carbonaceous, visible as black dots on the stromata. <i>Ascomata</i> 300–480 × 250–400 μm (x ̄ = 360 × 315 μm, n = 5), ovoid to obpyriform, laterally compressed. <i>Ostioles</i> pointed, raised. <i>Paraphyses</i> 3–7 μm wide, long, numerous, filamentous, flexuous, septate, constricted at the septa, apex rounded, slightly tapering towards the apex. <i>Asci</i> 75–95 × 5.7–9 μm (x ̄ = 86 × 7.7 μm, n = 20), 8 - spored, unitunicate, cylindrical, short pedicellate, with a 5–6.6 × 3.5–5 μm (x ̄ = 5.8 × 4.2 μm, n = 20), wedge-shaped apical ring, apex rounded. <i>Ascospores</i> 8–11 × 4.4–6 μm (x ̄ = 10 × 5 μm, n = 30), uniseriate, unicellular, ellipsoid, rounded ends, hyaline when immature, dark brown to black when mature, 1–2 - guttulate, aseptate, with straight germ slit along the entire spore length. <b>Asexual morph</b>: Undetermined.</p><p><b>Culture characteristics.</b></p><p>Ascospores germinating on PDA within 24 hrs at room temperature. Germ tubes are produced from the basal cells of the ascospore. Colonies on PDA, reaching 55 mm diameter after one week at 20–25 ° C, mycelia superficial, circular, dense, fimbriate, entire edged, white; reverse view white.</p><p><b>Material examined.</b></p><p>China • Yunnan Province, Xishuangbanna, Xishuangbanna Dai Autonomous Prefecture, Jinghong (21°55.19'N, 101°15.24'E, elevation: 522 m), on dead woody twigs of undetermined tree, 15 July 2019, G. C Ren, XS 19 (holotype, HKAS 122774), ex-type culture KUNCC 21-0672.</p><p><b>GenBank numbers.</b></p><p>ITS: PP 663077, LSU: PP 663083, SSU: PX 583847, <i>tef</i> 1 - α: PX 521738, <i>rpb</i> 2: PX 521740.</p><p><b>Notes.</b></p><p>Multi-loci phylogenetic analyses based on a concatenated LSU, ITS, <i>tef</i> 1 - a, and <i>rpb</i> 2 dataset show that our new strain (KUNCC 21-0672) clustered with <i>Biscogniauxia capnodes</i> (YMJ 138) with 100 % ML and 1.00 BYPP bootstrap support (Fig. 15). Sequence comparison for the ITS region between <i>Biscogniauxia xishuangbannaensis</i> (KUNCC 21-0672) and <i>Biscogniauxia capnodes</i> (YMJ 138) showed a 2.49 % (15 / 602 bp, without gaps) base pair difference, 3.15 % (32 / 1015 bp, without gaps) base pair difference for <i>rpb</i> 2 region. <i>Biscogniauxia capnodes</i> differs from our strain by its elongated, erumpent patches, obovoid to tubular perithecia, discoid apical ring and large ascospores (Berkeley 1845; Ju and Rogers 2001). Based on morphology and the phylogenetic distinctiveness, we introduce <i>Biscogniauxia xishuangbannaensis</i> as a new species.</p>