Pseudochaetosphaeronema heveae R. F. Xu, K. D. Hyde & Tibpromma 2026, sp. nov.
Authors/Creators
- 1. School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand & Center for Yunnan Plateau Biological Resources Protection and Utilization & Yunnan International Joint Laboratory of Fungal Sustainable Utilization in South and Southeast Asia, College of Biology and Food Engineering, Qujing Normal University, Qujing 655099, China
- 2. Center for Yunnan Plateau Biological Resources Protection and Utilization & Yunnan International Joint Laboratory of Fungal Sustainable Utilization in South and Southeast Asia, College of Biology and Food Engineering, Qujing Normal University, Qujing 655099, China
- 3. Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand
- 4. School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand & Microbial Products and Innovations Research Group, Mae Fah Luang University, Chiang Rai, 57100, Thailand
- 5. Bioeconomy Science Institute, Private Bag 92170, Auckland, New Zealand
- 6. Center of Excellence in Biotechnology Research (CEBR), King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
- 7. Yunnan Key Laboratory for Fungal Diversity and Green Development & Yunnan International Joint Laboratory of Fungal Sustainable Utilization in South and Southeast Asia, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- 8. Department of Botany and Microbiology, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
- 9. Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand & Department Microbial Drugs, Helmholtz Centre for Infection Research (HZI), Inhoffenstrasse 7, 38124, Braunschweig, Germany
Description
Pseudochaetosphaeronema heveae R. F. Xu, K. D. Hyde & Tibpromma sp. nov.
Fig. 4
Etymology.
Refers to the host genus Hevea.
Holotype.
GMB-W 1222
Description.
Saprobic on a decaying branch of Hevea brasiliensis. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 125–170 × 140–225 μm (x ̄ = 148 × 190 μm, n = 10), solitary to aggregated, globose to subglobose or pyriform, immersed to semi-immersed, unilocular, dark brown to black, appearing as black dots on the host surface. Conidiomatal wall 20–70 μm wide, brown to dark brown, textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 3–8 × 2–6 μm (x ̄ = 6 × 4.4 μm, n = 10), monophialidic, cylindrical or ampulliform, hyaline, smooth-walled, with guttules. Conidia 8–14 × 3–4 μm (x ̄ = 11.25 × 3.23 μm, n = 50), fusiform or fusoid, slightly curved, 1–2 - septate, constricted at septum, cell swollen sometimes, rounded at both ends, hyaline, smooth, thin-walled, without a mucilaginous sheath.
Culture characteristics.
Conidia germinating on PDA within 12 hours. Colonies irregular, umbonate, white to cream, with a central brown droplet, undulate margin; reverse dark brown with pale brown edge, producing brown pigment on PDA media.
Material examined.
China, • Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Mang City, on a decaying branch of Hevea brasiliensis, 18 April 2024, Rui-Fang Xu, DHR 27 (GMB-W 1222, holotype), ex-type living culture GMBCC 2333 = GMBCC 2334.
Notes.
In the phylogenetic analyses, GMBCC 2333 and GMBCC 2334 formed a distinct lineage, sister to P. siamensis (MFLUCC 17–2287, ex-type) and P. bruguierae (MFLUCC 24–0515, ex-type) (Fig. 1). Sequence comparisons showed that GMBCC 2333 differs from P. siamensis by 13 / 510 bp (ITS, 2.55 %), 3 / 810 bp (LSU, 0.20 %), 2 / 1,005 bp (SSU, 0.19 %), and 99 / 645 bp (tef 1 - α, 15.35 %); differences with P. bruguierae included 8 / 497 bp (ITS, 1.61 %), 2 / 810 bp (LSU, 0.25 %), and 28 / 893 bp (tef 1 - α, 3.14 %). Morphologically, P. heveae (GMB-W 1222, holotype) can be distinguished from P. coffeae (MHZU 23–0081, holotype) by smaller conidiomata (125–170 × 140–225 μm vs. 150–190 × 180–240 μm) and conidiogenous cells (3–8 × 2–6 μm vs. 6–9 × 3–6 μm), as well as shorter conidia (8–14 × 3–4 μm, 1–2 - septate vs. 12–16 × 3–5 μm, 1–3 - septate) (Lu et al. 2025). It also differs from P. bruguierae (MFLU 24–0192, holotype), which has larger conidiomata (230–400 × 300–370 μm), narrower conidiogenous cells (7–10 × 1–2.7 μm), and smaller conidia (5–10 × 2–3 μm), 2–3 - septate with guttules (Apurillo et al. 2025). Based on molecular and morphological evidence, we introduce our new collection as a new species, P. heveae.
Notes
Files
Files
(3.5 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:4a8ad3c5535361854515899738f5e616
|
3.5 kB | Download |
System files
(19.2 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:7dbc7f8cc52b41de49d7abb951730e65
|
19.2 kB | Download |
Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- GMBCC
- Material sample ID
- GMB-W 1222, GMBCC 2333, GMBCC 2334
- Event date
- 2024-04-18
- Verbatim event date
- 2024-04-18
- Scientific name authorship
- R. F. Xu, K. D. Hyde & Tibpromma
- Kingdom
- Fungi
- Phylum
- Ascomycota
- Order
- Pleosporales
- Family
- Macrodiplodiopsidaceae
- Genus
- Pseudochaetosphaeronema
- Species
- heveae
- Taxon rank
- species
- Taxonomic status
- sp. nov.
- Type status
- holotype
- Taxonomic concept label
- Pseudochaetosphaeronema heveae Xu, Hyde & Tibpromma, 2026
References
- Lu L, Karunarathna SC, Xiong Y, Han LS, Chen XM, Xu RF, Liu XF, Zeng XY, Dai DQ, Elgorban A, Jayawardena R, Hyde KD, Tibpromma S (2025) Taxonomy and systematics of micro-fungi associated with Coffea in southern China and northern Thailand. Fungal Diversity 25: 1–275. https://doi.org/10.1007/s13225-025-00566-x
- Apurillo CCS, Phukhamsakda C, Hyde KD, Thiyagaraja V, Jones EBG (2025) New fungal genus, three novel species, and one new record from mangroves, with reclassification of Melanconiella (Melanconiellaceae) species. MycoKeys 116: 25–52. https://doi.org/10.3897/mycokeys.116.137351