Cytospora piceicola Ilyukhin & Markovsk. 2025, sp. nov.
Bibliographic record
Abstract
Cytospora piceicola Ilyukhin & Markovsk. sp. nov. Fig. 4 Etymology. The name refers to the host genus, Picea, from which the fungus was first isolated. Holotype. Canada • Ontario, Lincoln, 43°06'39.0"N, 79°19'15.4"W, isolated from cankered wood (branches) of Picea glauca, April 2020, E. Ilyukhin (holotype BILAS 51884, ex-holotype living culture BILAS 51886 = EI-20, isotype DAOM 985024, DAOMC 256985). Description. Sexual morph: not observed in culture. Asexual morph: Conidiomata appearing after 25 days of incubation on MEA, rare, pycnidial, solitary, globose to subglobose, dark grey to black when dry, with few ovoid locules, (610 –) 824–1071 (– 1380) μm diam. Conidiophores micronematous, hyaline, smooth-walled, reduced to unbranched conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, lageniform, or ampulliform (7.5 –) 8.8–10.6 (– 13.0) × (1.0 –) 1.3–1.7 (– 2.0) μm. Conidia abundant, relatively small, single, hyaline, aseptate, slightly curved, allantoid, thin-walled (3.5 –) 3.8–4.9 (– 5.5) × (1.0 –) 0.8–1.3 (– 1.5) μm. Culture characteristics. Colonies on MEA white to light brown with short aerial mycelium tufts in the center, becoming darker with age, relatively slow-growing (28 mm in diameter) after 7 days of incubation. Hyphae hyaline, smooth, branched, and septate. Notes. Based on ITS sequence data, C. piceicola is 99 % similar to C. globosa MFLU: 16-2054 (554 / 559, 3 gaps) and C. pinastri CBS 113.81 (540 / 545, 0 gaps). But combined multi-gene phylogenetic analysis clearly distinguished C. piceicola from these two species (ML / BI = 95 / -). The new species, C. piceicola, differs from C. globosa (4–6.5 × 1–2 µm) and C. pinastri (4–7 × 1–1.3 μm) by having shorter conidia and clearly lageniform or ampulliform conidiogenous cells (Hayova and Minter 2013; Li et al. 2020). The culture characteristics cannot be used for species discrimination as they are either unavailable (C. pinastri) or different media has been used (C. globosa). Thus, C. piceicola is considered a novel species based on both molecular data and morphological characteristics.
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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 | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".