| _version_ | 1866901245285892096 |
|---|---|
| author | Xue, Junxia Yang, Zihao Li, Ruotong Zhang, Lulu |
| author_facet | Xue, Junxia Yang, Zihao Li, Ruotong Zhang, Lulu |
| contents | <p><i>Myriostigma melanovillosa</i> J. X. Xue & Lu L. Zhang sp. nov.</p><p>Fig. 4</p><p><b>Diagnosis.</b></p><p>The new species differs from other species of <i>Myriostigma</i> in the presence of black or purple dots on the thalli and hyaline to pale yellow ascospores (63–71 × 26–33 µm).</p><p><b>Type.</b></p><p>China • Yunnan Province, Xishuangbanna Dai Nationality Autonomous Prefecture, Jinghong City, Primitive Forest Park, 22°1'55.75"N, 100°52'37.47"E, alt. 689 m, on the bark of trees, 7 March 2023, L. L. Liu et al. 20230635 (SDNU, holotype).</p><p><b>Description.</b></p><p><i>Thallus</i> corticolous, up to 6 cm in diameter, ecorticate, cottony, dull, greenish grey to whitish grey, with black or purple dots, firmly attached to the substrate. <i>Isidia</i> not observed. <i>Prothallus</i> is usually distinct, thin, whitish byssoid, mainly composed of interwoven and radiating hyphae, 0.7–1.3 mm wide, forming a dark brown to black line while bordering different species. <i>Medulla</i> white, with calcium oxalate crystals. <i>Photobionts</i> trentepohlioid, cells rounded to elliptical, single or a few cells aggregated, 5–11 × 5–8 µm. <i>Hyphae</i> 1–2 µm wide.</p><p><i>Ascigerous areas</i> are distinct, generally delimited, erumpent, slightly raised above the thallus level, plaque, irregular in outline, white with dense brown dots indicating individual asci. <i>Asci</i> frequent, hyaline, pale yellow when mature, globose to subglobose, often covered by hyaline hyphae, 8 - spored, 103–115 × 97–115 µm. <i>Ascospores</i> hyaline, pale yellow when mature, oblong, muriform, curved, often broader in the centre, 63–71 × 26–33 µm.</p><p><i>Pycnidia</i> were not observed.</p><p><b>Chemistry.</b></p><p>thallus C + red, K –, P –, UV + pale grey-white; medulla and paraphysoids I + sky-blue. TLC: gyrophoric acid, lecanoric acid and confluentic acid.</p><p><b>Etymology.</b></p><p>The epithet refers to the presence of black or purple dots on the thallus.</p><p><b>Ecology and distribution.</b></p><p>This species is found only in China on the bark of trees in a humid tropical forest in Yunnan Province.</p><p><b>Notes.</b></p><p>Morphologically, <i>Myriostigma melanovillosa</i> is similar to <i>M. irregularis</i> Lücking, Aptroot, Kalb & Elix, as they both have irregular erumpent and with brown dots whitish ascigerous areas, but <i>M. irregularis</i> has narrower asci (40–70 µm wide) and psoromic acid, subpsoromic acid, 2 ′ - <i>O</i> - demethylpsoromic acid and trace confluentic acid as secondary metabolites (Lücking et al. 2006).</p><p>Phylogenetically, <i>Myriostigma melanovillosa</i> is clustered with <i>Stirtonia neotropica</i> Aptroot. They both have C + red thalli and 8 - spored asci, but <i>S. neotropica</i> has linear shape ascigerous areas, ovoid asci and transversely septate ascospores (35–38 × 10–12 µm) (Aptroot 2009).</p><p><b>Additional specimens examined.</b></p><p>China • Yunnan Province, Xishuangbanna Dai Nationality Autonomous Prefecture, Jinghong City, Primitive Forest Park, 22°1'55.75"N, 100°52'37.47"E, alt. 689 m, on the bark of trees, 7 March 2023, L. L. Liu et al. 20230629 (SDNU); • <i>ibid</i>., 20234628 (SDNU).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_14976234 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Myriostigma melanovillosa J. X. Xue & Lu L. Zhang 2025, sp. nov. Xue, Junxia Yang, Zihao Li, Ruotong Zhang, Lulu Biodiversity Taxonomy Fungi Ascomycota Arthoniomycetes Arthoniales Arthoniaceae Myriostigma Myriostigma melanovillosa <p><i>Myriostigma melanovillosa</i> J. X. Xue & Lu L. Zhang sp. nov.</p><p>Fig. 4</p><p><b>Diagnosis.</b></p><p>The new species differs from other species of <i>Myriostigma</i> in the presence of black or purple dots on the thalli and hyaline to pale yellow ascospores (63–71 × 26–33 µm).</p><p><b>Type.</b></p><p>China • Yunnan Province, Xishuangbanna Dai Nationality Autonomous Prefecture, Jinghong City, Primitive Forest Park, 22°1'55.75"N, 100°52'37.47"E, alt. 689 m, on the bark of trees, 7 March 2023, L. L. Liu et al. 20230635 (SDNU, holotype).</p><p><b>Description.</b></p><p><i>Thallus</i> corticolous, up to 6 cm in diameter, ecorticate, cottony, dull, greenish grey to whitish grey, with black or purple dots, firmly attached to the substrate. <i>Isidia</i> not observed. <i>Prothallus</i> is usually distinct, thin, whitish byssoid, mainly composed of interwoven and radiating hyphae, 0.7–1.3 mm wide, forming a dark brown to black line while bordering different species. <i>Medulla</i> white, with calcium oxalate crystals. <i>Photobionts</i> trentepohlioid, cells rounded to elliptical, single or a few cells aggregated, 5–11 × 5–8 µm. <i>Hyphae</i> 1–2 µm wide.</p><p><i>Ascigerous areas</i> are distinct, generally delimited, erumpent, slightly raised above the thallus level, plaque, irregular in outline, white with dense brown dots indicating individual asci. <i>Asci</i> frequent, hyaline, pale yellow when mature, globose to subglobose, often covered by hyaline hyphae, 8 - spored, 103–115 × 97–115 µm. <i>Ascospores</i> hyaline, pale yellow when mature, oblong, muriform, curved, often broader in the centre, 63–71 × 26–33 µm.</p><p><i>Pycnidia</i> were not observed.</p><p><b>Chemistry.</b></p><p>thallus C + red, K –, P –, UV + pale grey-white; medulla and paraphysoids I + sky-blue. TLC: gyrophoric acid, lecanoric acid and confluentic acid.</p><p><b>Etymology.</b></p><p>The epithet refers to the presence of black or purple dots on the thallus.</p><p><b>Ecology and distribution.</b></p><p>This species is found only in China on the bark of trees in a humid tropical forest in Yunnan Province.</p><p><b>Notes.</b></p><p>Morphologically, <i>Myriostigma melanovillosa</i> is similar to <i>M. irregularis</i> Lücking, Aptroot, Kalb & Elix, as they both have irregular erumpent and with brown dots whitish ascigerous areas, but <i>M. irregularis</i> has narrower asci (40–70 µm wide) and psoromic acid, subpsoromic acid, 2 ′ - <i>O</i> - demethylpsoromic acid and trace confluentic acid as secondary metabolites (Lücking et al. 2006).</p><p>Phylogenetically, <i>Myriostigma melanovillosa</i> is clustered with <i>Stirtonia neotropica</i> Aptroot. They both have C + red thalli and 8 - spored asci, but <i>S. neotropica</i> has linear shape ascigerous areas, ovoid asci and transversely septate ascospores (35–38 × 10–12 µm) (Aptroot 2009).</p><p><b>Additional specimens examined.</b></p><p>China • Yunnan Province, Xishuangbanna Dai Nationality Autonomous Prefecture, Jinghong City, Primitive Forest Park, 22°1'55.75"N, 100°52'37.47"E, alt. 689 m, on the bark of trees, 7 March 2023, L. L. Liu et al. 20230629 (SDNU); • <i>ibid</i>., 20234628 (SDNU).</p> |
| title | Myriostigma melanovillosa J. X. Xue & Lu L. Zhang 2025, sp. nov. |
| topic | Biodiversity Taxonomy Fungi Ascomycota Arthoniomycetes Arthoniales Arthoniaceae Myriostigma Myriostigma melanovillosa |
| url | https://doi.org/10.5281/zenodo.14976234 |