| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Dickwhitea
Taxonomy
Dickwhitea was named by Karafit et al. (2006). It is not extant. It is considered to be a form taxon.
It was assigned to Athyriaceae by Karafit et al. (2006).
It was assigned to Athyriaceae by Karafit et al. (2006).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Dickwhitea Karafit et al. p. 722 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S.J. Karafit et al. 2006 | Morphotaxon of permineralized fern rhizomes with diverging stipes and adventitious roots. Rhizomes 6–7 mm wide; radial, with relatively long internodes. Pith and cortex parenchymatous, with clusters of cells containing dark contents immediately to the inside and outside of cauline bundles; sclerotic hypodermis
0.2–0.4 mm wide. Xylem cylinder of five independent amphiphloic cauline bundles; frond traces of two hippocampiform bundles diverging from adjacent cauline bundles. Successive frond traces diverging from margins of cauline bundles that are separated by two intermediate cauline bundles, producing 2/5 phyllotactic helix. True leaf gaps absent. Cauline bundles 5–15 tracheids thick, lacking protoxylem strand; expanding tangentially from alternate sides to produce successive stipe traces. Stipes 2.8–3.0 mm wide, with two hippocampiform bundles; roots diarch with parenchymatous cortex grading to sclerenchyma near epidermis. Frond architecture, pinnules, sporangia, and spores unknown. |
Measurements
No measurements are available
No ecological data are available
Age range: Middle Eocene or 47.80000 to 37.71000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Eocene | Canada (British Columbia) | D. allenbyensis (32305) |