Molecular and morphological insights into Phaeoceros himalayensis (Notothyladaceae) and related species: evidence for two new species from Thailand
Bibliographic record
Abstract
The hornwort genus Phaeoceros is morphologically diverse, particularly in sporophyte and spore characters. Among its members, P. himalayensis and P. kashyapii , two previously known species from the Himalayan region, are distinct in their stalked tuber thalli, dark brown sporophytes with valves apically adherent at maturity, and vermiculate spores with or without hump-like projections or verrucae on the distal face. In this study, we combine detailed morphological and molecular evidence to investigate species boundaries within the group of species possessing these traits, comprising P. himalayensis , P. kashyapii , and related taxa. Within Phaeoceros , two fully supported clades were recovered, here recognized as subgenus Phaeoceros and subgenus Himalayanus, subgen. nov. Molecular and morphological data also support the recognition of two new species, P. aequatus and P. stenothallus , both from northern Thailand. The new species are distinguished by unique spore ornamentation together with the production of tubers. These findings support the ancient evolutionary divergence of the Himalayan Phaeoceros lineage and underscore the taxonomic significance of spore features and tuber formation. This study adds valuable information to our knowledge of hornwort diversity and evolution, providing a foundation for future systematic and evolutionary studies.
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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) | 0.000 | 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) | 0.001 | 0.000 |
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".