Myxarium inconspicuum Spirin 2025, comb. nov.
Bibliographic record
Abstract
Myxarium inconspicuum (Pat.) Spirin comb. nov. Fig. 8 F ≡ Tremella inconspicua Pat., Bulletin de la Société Mycologique de France 9: 138, 1893. Holotype. Ecuador. Pichincha: Quito (surroundings), dead wood, II. 1892 Lagerheim (FH 00060386, studied). Description. Basidiocarps first pustular, 0.2–0.4 mm in diam., then fusing together and forming a compound basidiocarp, up to 5 mm in widest dimension, indistinctly tuberculate, gelatinous, opalescent, whitish, 0.1–0.2 mm thick, in dry condition hardly visible, margin sharply delimited, adnate. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae totally collapsed, subhymenial hyphae thin-walled, ascending, 1.5–2.5 μm in diam. Hyphidia abundant, richly branched, 1–2 μm in diam. at the apical part, scattered among basidia and partly covering basidial cells. Basidia four-celled, longitudinally septate, ellipsoid to broadly ellipsoid, pedunculate, (8.1 –) 8.3–9.2 (– 10.6) × (6.2 –) 6.5–8.2 (– 8.6) μm (n = 20 / 1), stalk up to 15 × 2–2.5 μm, sterigmata up to 7 × 1.5 μm. Basidiospores smooth, thin-walled, narrowly ellipsoid to ellipsoid or more rarely cylindrical, (5.0 –) 5.7–8.2 (– 8.9) × (3.4 –) 3.6–5.0 (– 5.1) μm (n = 30 / 1), L = 6.99, W = 4.30, Q’ = (1.3 –) 1.4–2.0 (– 2.2), Q = 1.63. Remarks. Tremella inconspicua was described from Ecuador (Patouillard and Lagerheim 1893), and its connection with Myxarium was discussed by Spirin et al. (2019 b). We restudied the type specimen of T. inconspicua and are fairly confident that it belongs to Myxarium. Both macroscopically and anatomically, M. inconspicuum is similar to the European Myxarium grilletii (Boud.) D. A. Reid; it differs from the latter species in having predominantly narrowly ellipsoid spores with a convex ventral side, while in M. grilletii (European specimens) the spores are mainly cylindrical or broadly cylindrical and often somewhat curved. However, the North American specimens of M. grilletii studied and illustrated by Spirin et al. (2019 b) possess predominantly ellipsoid basidiospores. An ITS sequence obtained from the Canadian specimen of M. grilletii (GenBank MK 098896, designated as Myxarium aff. grilletii in Fig. 5) is identical with an unnamed sequence from the USA (GenBank KX 193945), and they clearly deviate from M. grilletii sequences from Europe. They may therefore represent a separate species and may in fact be conspecific with M. inconspicuum. Answering this question is not feasible without access to newly collected and sequenced material from Ecuador. Myxarium guianense introduced above differs from M. inconspicuum by its smaller discrete basidiocarps, slightly narrower basidiospores, and the presence of cystidia.
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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 | 0.001 |
| 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 | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.009 |
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".