Malbranchea seminuda Guerra-Mateo, Cano & Gene 2025, sp. nov.
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| author | Guerra-Mateo, Daniel Gené, Josepa Becker, Pierre Cano-Lira, José F. |
| author_facet | Guerra-Mateo, Daniel Gené, Josepa Becker, Pierre Cano-Lira, José F. |
| contents | <p><i>Malbranchea seminuda</i> Guerra-Mateo, Cano & Gené sp. nov.</p><p>Fig. 10</p><p><b>Etymology.</b></p><p>Latin <i>semi</i> -, half, and Latin <i>nūda</i>, naked, referring to the ascomata with slightly differentiated peridial hyphae.</p><p><b>Type.</b></p><p>Spain • Catalonia, Mediterranean coast, Tarragona, Platja del Miracle, 41°6'6"N, 1°15'44"E, from sediments at 27 m depth, June 2021, G. Quiroga-Jofre & D. Guerra-Mateo (holotype CBS H- 25614, ex-type FMR 19403, CBS 152722).</p><p><b>Description.</b></p><p><i>Saprobic</i> from marine environment. <i>Mycelium</i> superficial and immersed, composed of hyaline, septate, branched, smooth-walled, 2.5–3 µm wide hyphae. <i>Asexual morph</i> with straight, branched, cylindrical, 2.5–3 µm wide fertile hyphae, giving rise to arthroconidia in a random disposition. <i>Arthroconidia</i> enteroarthric, 0–1 - septate, hyaline, smooth- and thin-walled, cylindrical to subcylindrical or T-shaped, (4 –) 12–13 (– 14.5) × 2.5–3 µm; secession rhexolytic. <i>Sexual morph</i> homothallic. <i>Gymnothecia</i> observed in all media tested, superficial, aggregated, white to pale yellow, turning pale orange-brown in old cultures (8 weeks), globose to subglobose, 350–500 µm diam.; peridium composed of a subtle network of hyphae, septate, branched, hyaline to pale yellow, verruculose to verrucose (tuberculate under SEM), 2.5–3 µm wide. <i>Asci</i> 8 - spored, evanescent, irregularly disposed, subglobose or pyriform, 11.5–14 × 9–10.5 µm. <i>Ascospores</i> unicellular, pale yellow, reticulate (reticulation regular with polygonal meshes and conspicuous ridges under SEM), thick-walled, globose, 4–5 µm diam.</p><p><b>Culture characteristics</b></p><p>(after 14 days at 25 ° C). Colonies on OA reaching 30 mm, flat, with sparse white aerial mycelium at center and glabrous towards periphery, margin diffuse, ascomata abundant and densely aggregated in a concentric ring; reverse uncolored. On PDA, 37 mm diam., slightly floccose, with concentrical rings, greenish yellow (1 A 6), margin entire and diffuse, ascomata abundant arranged in concentric rings; reverse brownish yellow (5 C 8) at center, yellowish brown (5 E 8) and yellowish white (1 A 2) at periphery. On PYE, 44 mm diam., slightly raised with concentrical rings, radially sulcate, floccose, white (1 A 1) to greenish yellow (1 A 6), margin entire, submerged in the medium, ascomata abundant arranged in concentric rings; reverse uncolored. Diffusible pigment not observed in any of the media studied.</p><p><b>Cardinal temperatures for growth.</b></p><p>Minimum 5 ° C (1 mm), optimum 25 ° C (37 mm), maximum 30 ° C (24 mm).</p><p><b>Habitat and geographic distribution.</b></p><p>Marine sediments in Spain. In GlobalFungi, in soil from different environments (forest, shrubland, and grassland) and marine and terrestrial sediments. Germany, Greece, the Netherlands, South Africa, Spain, the USA, and Zimbabwe (Fig. 4).</p><p><b>Notes.</b></p><p><i>Malbranchea seminuda</i> is phylogenetically related to <i>M. longispora</i> and <i>M. multiseptata</i> (Fig. 3). The three species produce an asexual morph consisting of hyaline and smooth-walled enteroarthric conidia. However, they differ in conidia disposition and size, with <i>M. longispora</i> showing straight chains of larger conidia (4–24 × 1–5.5 µm) (Crous et al. 2013), <i>M. seminuda</i> displaying straight chains of medium-size conidia (4 –) 12–13 (– 14.5) × 2.5–3 µm, and <i>M. multiseptata</i> producing straight and sinuous chains of smaller conidia (3–9 × 1.5–2 µm) (Rodríguez-Andrade et al. 2021). In addition, only <i>M. seminuda</i> and <i>M. longispora</i> produce sexual morphs, which differ in the peridium morphology; while the former species shows a subtle network of hyaline and verruculose to verrucose hyphae, <i>M. longispora</i> displays a conspicuous network of pale yellow to orange-brown, thick-walled, tuberculate hyphae (Crous et al. 2013). Other phylogenetically distant species with ascomata morphologically similar to those of <i>M. seminuda</i> are <i>M. concentrica</i> and <i>M. kuehnii</i>. The three species can be distinguished by the ornamentation pattern of the peridial hyphae, being verrucose in <i>M. seminuda</i> and <i>M. kuehnii</i> but smooth-walled in <i>M. concentrica</i> (Solé et al. 2002). <i>Malbranchea seminuda</i> differs from <i>M. kuehnii</i> in the colour of the ascospores (pale yellow vs. hyaline, respectively) and colonies on PDA (greenish-yellow vs. brown, respectively) (Solé et al. 2002).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_17055549 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
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| spellingShingle | Malbranchea seminuda Guerra-Mateo, Cano & Gene 2025, sp. nov. Guerra-Mateo, Daniel Gené, Josepa Becker, Pierre Cano-Lira, José F. Biodiversity Taxonomy Fungi Ascomycota Eurotiomycetes Onygenales Gymnoascaceae Malbranchea Malbranchea seminuda <p><i>Malbranchea seminuda</i> Guerra-Mateo, Cano & Gené sp. nov.</p><p>Fig. 10</p><p><b>Etymology.</b></p><p>Latin <i>semi</i> -, half, and Latin <i>nūda</i>, naked, referring to the ascomata with slightly differentiated peridial hyphae.</p><p><b>Type.</b></p><p>Spain • Catalonia, Mediterranean coast, Tarragona, Platja del Miracle, 41°6'6"N, 1°15'44"E, from sediments at 27 m depth, June 2021, G. Quiroga-Jofre & D. Guerra-Mateo (holotype CBS H- 25614, ex-type FMR 19403, CBS 152722).</p><p><b>Description.</b></p><p><i>Saprobic</i> from marine environment. <i>Mycelium</i> superficial and immersed, composed of hyaline, septate, branched, smooth-walled, 2.5–3 µm wide hyphae. <i>Asexual morph</i> with straight, branched, cylindrical, 2.5–3 µm wide fertile hyphae, giving rise to arthroconidia in a random disposition. <i>Arthroconidia</i> enteroarthric, 0–1 - septate, hyaline, smooth- and thin-walled, cylindrical to subcylindrical or T-shaped, (4 –) 12–13 (– 14.5) × 2.5–3 µm; secession rhexolytic. <i>Sexual morph</i> homothallic. <i>Gymnothecia</i> observed in all media tested, superficial, aggregated, white to pale yellow, turning pale orange-brown in old cultures (8 weeks), globose to subglobose, 350–500 µm diam.; peridium composed of a subtle network of hyphae, septate, branched, hyaline to pale yellow, verruculose to verrucose (tuberculate under SEM), 2.5–3 µm wide. <i>Asci</i> 8 - spored, evanescent, irregularly disposed, subglobose or pyriform, 11.5–14 × 9–10.5 µm. <i>Ascospores</i> unicellular, pale yellow, reticulate (reticulation regular with polygonal meshes and conspicuous ridges under SEM), thick-walled, globose, 4–5 µm diam.</p><p><b>Culture characteristics</b></p><p>(after 14 days at 25 ° C). Colonies on OA reaching 30 mm, flat, with sparse white aerial mycelium at center and glabrous towards periphery, margin diffuse, ascomata abundant and densely aggregated in a concentric ring; reverse uncolored. On PDA, 37 mm diam., slightly floccose, with concentrical rings, greenish yellow (1 A 6), margin entire and diffuse, ascomata abundant arranged in concentric rings; reverse brownish yellow (5 C 8) at center, yellowish brown (5 E 8) and yellowish white (1 A 2) at periphery. On PYE, 44 mm diam., slightly raised with concentrical rings, radially sulcate, floccose, white (1 A 1) to greenish yellow (1 A 6), margin entire, submerged in the medium, ascomata abundant arranged in concentric rings; reverse uncolored. Diffusible pigment not observed in any of the media studied.</p><p><b>Cardinal temperatures for growth.</b></p><p>Minimum 5 ° C (1 mm), optimum 25 ° C (37 mm), maximum 30 ° C (24 mm).</p><p><b>Habitat and geographic distribution.</b></p><p>Marine sediments in Spain. In GlobalFungi, in soil from different environments (forest, shrubland, and grassland) and marine and terrestrial sediments. Germany, Greece, the Netherlands, South Africa, Spain, the USA, and Zimbabwe (Fig. 4).</p><p><b>Notes.</b></p><p><i>Malbranchea seminuda</i> is phylogenetically related to <i>M. longispora</i> and <i>M. multiseptata</i> (Fig. 3). The three species produce an asexual morph consisting of hyaline and smooth-walled enteroarthric conidia. However, they differ in conidia disposition and size, with <i>M. longispora</i> showing straight chains of larger conidia (4–24 × 1–5.5 µm) (Crous et al. 2013), <i>M. seminuda</i> displaying straight chains of medium-size conidia (4 –) 12–13 (– 14.5) × 2.5–3 µm, and <i>M. multiseptata</i> producing straight and sinuous chains of smaller conidia (3–9 × 1.5–2 µm) (Rodríguez-Andrade et al. 2021). In addition, only <i>M. seminuda</i> and <i>M. longispora</i> produce sexual morphs, which differ in the peridium morphology; while the former species shows a subtle network of hyaline and verruculose to verrucose hyphae, <i>M. longispora</i> displays a conspicuous network of pale yellow to orange-brown, thick-walled, tuberculate hyphae (Crous et al. 2013). Other phylogenetically distant species with ascomata morphologically similar to those of <i>M. seminuda</i> are <i>M. concentrica</i> and <i>M. kuehnii</i>. The three species can be distinguished by the ornamentation pattern of the peridial hyphae, being verrucose in <i>M. seminuda</i> and <i>M. kuehnii</i> but smooth-walled in <i>M. concentrica</i> (Solé et al. 2002). <i>Malbranchea seminuda</i> differs from <i>M. kuehnii</i> in the colour of the ascospores (pale yellow vs. hyaline, respectively) and colonies on PDA (greenish-yellow vs. brown, respectively) (Solé et al. 2002).</p> |
| title | Malbranchea seminuda Guerra-Mateo, Cano & Gene 2025, sp. nov. |
| topic | Biodiversity Taxonomy Fungi Ascomycota Eurotiomycetes Onygenales Gymnoascaceae Malbranchea Malbranchea seminuda |
| url | https://doi.org/10.5281/zenodo.17055549 |