Pseudopithomyces chartarum Jun F. Li, Ariyaw. & K. D. Hyde
Bibliographic record
Abstract
Pseudopithomyces chartarum (Berk. & M. A. Curtis) Jun F. Li, Ariyaw. & K. D. Hyde, Fungal Divers 75: 66 (2015) Fig. 11 Description. Saprobic on a dead leaf of Hedychium coronarium (Zingiberaceae). Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies effuse, scattered, powdery, dark brown to black. Vegetative hyphae superficial or partly immersed in the substrate, composed of septate, branched, smooth, thin-walled hyphae. Conidiophores mononematous, micronematous, mostly intercalary, sometimes denticulate, aseptate. Conidiogenous cells with 2 µm broad conidial attachment, terminal, hyaline, globose or subglobose, integrated, hyaline to pale brown. Conidia 15–21 × 8–10 μm (x ̄ = 17 × 9.1 μm, n = 40), solitary, initially light brown, becoming brown to dark brown at maturity, obovate to oblong, verruculose to spinulose, muriform, 3–4 vertical septa, mostly 1–2 longitudinal dark septa, darken and slightly constricted at the septa, thick-walled. Material examined. China • Guangdong Province, Shenzhen, on dead leaf of Hedychium coronarium (Zingiberaceae), 15 December 2024, D. S. Tennakoon, DSZ 10 (SZU 25-022, new host record), living culture, MBSZU 25-030. Known hosts. Bauhinia spp., Centrosema pubescens, Ceratonia siliqua, Chloris gayana, Chrysanthemum coronarium, Cirsium arvense, Cocos spp., Colocasia spp., Commelina benghalensis, Conyza bonariensis, Crotalaria pseudospartium, Crotalaria striata, Cunninghamia lanceolata, Cupania macrophylla, Cynodon spp., Dactylis glomerata, Daucus spp., Descurainia sophia, Desmodium spp., Digitaria spp., Dolichos spp., Eichhornia crassipes, Elegia spp., Eucalyptus spp., Foeniculum vulgare, Glycine spp., Gossypium spp., Guazuma ulmifolia, Harpullia spp., Ipomoea spp., Juncus roemerianus, Leucaena spp., Macaranga tanarius, Magnolia grandiflora, Malus spp., Medicago spp., Miscanthus spp., Morus spp., Musa spp., Oryza sativa, Pandanus tectorius, Panicum spp., Phyllostachys spp., Radermachera sinica, and Zea mays (Hyde et al. 2017; Jayasiri et al. 2019; Tennakoon et al. 2021; Farr and Rossman 2025; this study). Known distribution. Australia, Austria, Brazil, Canada, China, Cuba, Japan, Ghana, Greece, India, Indonesia, Kenya, Malaysia, Myanmar, Nicaragua, New Zealand, Papua New Guinea, Poland, South Africa, Sudan, Thailand, Venezuela, the United States (Hyde et al. 2017; Jayasiri et al. 2019; Tennakoon et al. 2021; Farr and Rossman 2025; this study). Notes. Due to the morphological characteristics largely overlapping with those of Pseudopithomyces chartarum isolates, we report our collection (SZU 25-022) as a new host record of P. chartarum from dead leaves of Hedychium coronarium (Zingiberaceae). For instance, our collection resembles P. chartarum, having powdery, dark brown to black colonies on the host surface and brown, obovate to oblong, muriform conidia (Ariyawansa et al. 2015; Jayasiri et al. 2019; Samaradiwakara et al. 2022; Wu et al. 2023). Phylogeny also shows that our collection groups with other P. chartarum isolates in a well-supported clade (90 % ML, 0.98 BYPP).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".