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Pseudohelminthosporium clematidis Phukhams. & K. D. Hyde, in Tan, Bishop-Hurley, Marney & Shivas, Index of Australian Fungi 53: 13 (2025) Fig. 6 = Pseudohelminthosporium clematidis Phukhams. & K. D. Hyde, in Phukhamsakda et al., Fungal Diversity 102: 59 (2020). = Pseudohelminthosporium clematidis Phukhams. & K. D. Hyde, in Tan & Dearnaley, Index of Australian Fungi 52: 5 (2025). Holotype. MFLU 17–1494. Description. Saprobic on decaying wood or herbaceous plant material in terrestrial habitats. Sexual morph: Undetermined. Asexual morph: Colonies on Clematis sikkimensis effuse, black, hairy, scattered, dark brown. Mycelium immersed, on the substrate surface forming stroma-like aggregations of dark brown sheet. Conidiophores 125–435 × 9–20 μm (x ̄ = 230 × 12 μm, n = 20), macronematous, simple, solitary, branched at the apex, stipes straight or flexuous, cylindrical, erect, septate, smooth, dark brown to reddish brown, 8–14 septa, brown, well-defined small pores with dark scar at the apex, smooth or verruculose. Conidiogenous cells 17–60 × 9–12 μm (x ̄ = 40 × 12 μm, n = 10), monotretic or polytretic, integrated, terminal, becoming intercalary, doliiform to oblong, pale brown. Conidia 63–142 × 16–26 μm (x ̄ = 87 × 20 μm, n = 20), phragmosporous, acrogenous, broad fusiform or obclavate, distoseptate at the early state, 3–12 - euseptate at maturity, slightly constricted at septa, dark brown to reddish brown, verrucose, gradually tapering to 13 μm at the distal end, with a dark brown to black scar present at the base, subhyaline, elongate cells at the upper end of conidia, with (1 –) 2 guttules in each cell. Material examined. Thailand, • Chiang Rai Province, Mae Sai District, dead stems of Clematis sikkimensis, 24 June 2017, C. Phukhamsakda & M. van de Bult, CMTHDT 02 (MFLU 17–1494, holotype); ex-type living culture, MFLUCC 17–2086. Notes. We have reverified the type specimen of Pseudohelminthosporium clematidis and reinstated the genus Pseudohelminthosporium. Koukol and Delgado (2021) treated Pseudohelminthosporium as a synonym of Neopodoconis, considering P. clematidis conspecific with N. ampullacea. However, we do not concur with this taxonomic interpretation as their conclusion was largely based on morphological resemblance without any molecular support. The morphological characteristics of Pseudohelminthosporium, particularly its mode of conidiogenesis, conidial morphology, and stromatic development, are sufficiently distinct from Neopodoconis. While Koukol and Delgado (2021) emphasised the similarity in polytretic, sympodial conidiogenesis and conidial septation patterns, their argument fails to acknowledge the variability and structural nuances described in the protologue of P. clematidis by Phukhamsakda et al. (2020). Moreover, the synonymy was proposed without molecular data derived from the type materials of P. clematidis and N. ampullacea, rendering their conclusion speculative. Therefore, until comparative molecular data from authentic type specimens of both taxa are available, the synonymy remains inconclusive. Based on morphological and developmental features, we uphold Pseudohelminthosporium as a distinct and valid genus within Neomassarinaceae, based on multigene phylogenetic analyses. The same applies to the original publication by Phukhamsakda et al. (2020), which placed this genus within Neomassarinaceae. Notably, the description provided by Phukhamsakda et al. (2020) has been revised following a re-examination of the type specimen. A discrepancy was noted between the conidial septation mentioned in the original description and illustrated conidia (fig. 37 j, p. 69). Based on this re-evaluation, the conidial septation is amended to 3–12 - euseptate, rather than 3–5 - euseptate as originally reported. A detailed synopsis table of morphologically similar genera Neopodoconis, Pseudohelminthosporium, Rostriconidium, and Sporidesmioides is given in Table 3.
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ประเด็นที่เกี่ยวข้อง: Mycorrhizal Fungi and Plant Interactions · Plant Pathogens and Fungal Diseases · Slime Mold and Myxomycetes Research
บทบาทของนักวิจัยและสถาบันไทย
Nakarin Suwannarach · Chiang Mai University
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