Anatomy of the hinge region of the petiole of prostrate leaves of the wintergreen fern <i>Polystichum acrostichoides</i> (Dryopteridaceae)
Bibliographic record
Abstract
The reorientation of leaves of Polystichum acrostichoides (Michx.) Schott to a prostrate position is achieved by forming a hinge region near the base of the petiole. Anatomical details of the distal transition zone (DTZ), folding zone (FZ), and proximal transition zone (PTZ) of the hinge region were studied using light microscopy. Data showed that the vascular bundles (VBs) are intact throughout the hinge region. Towards the FZ, the DTZ and PTZ have an increasing number of cortical cells that underwent deformation and protoplast degeneration, and cell nuclei are apparent in strongly deformed cortical cells. In the FZ, the petiole is compressed, having a network of cell walls of dead cortical cells with patches of turgid cortical cells, and largely intact endodermis surrounding the VBs. The helical secondary wall thickenings of the protoxylem and scalariform thickenings of the metaxylem may contribute to the flexibility of the VBs. This study provided evidence for the deformation and degeneration of cortical cells, which is responsible for the loss of turgidity of the hinge region while their cell walls may provide cushioning during bending and insulation for the living tissues under the snowpack, illustrating a unique strategy of ferns to adapt to a cold environment.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".