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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Yavanna
Discussion
Derivation of generic name. The generic name is proposed after Yavanna, fictional character of The Silmarillion written by J.R.R. Tolkien. In Tolkiens writings, Yavanna is a godlike entity (an Ainur), creator of the plants and animals that inhabit the Middle Earth.
Taxonomy
Yavanna was named by Vera (2013). Its type is Yavanna chimaerica.
It was assigned to Cyatheales by Vera (2013).
It was assigned to Cyatheales by Vera (2013).
Species
Y. chimaerica (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Yavanna Vera p. 215 |
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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 | |
|---|---|---|
| E. I. Vera 2013 | Fossil tree fern stem with attached petiole bases and adventitious roots. Internally, presenting a solenostele and accessory medullary bundles, both surrounded by a sclerenchyma sheath. Pith and cortex parenchymatous, the latter enclosed by the hypodermis. Proximal petiole bases vascularized by one corrugated meristele, arranged in a modified omega-shaped structure, with a pair of deep lateral constrictions. Distal petiole bases with three meristeles, resulting from the division of the single meristele in two adaxial arcs and one abaxial arc. Corrugations of vascular strands of the petiole base due to the repetition of V-shaped units. Adventitious roots protostelic, with internal parenchymatic and external sclerenchymatic cortex. |
Measurements
No measurements are available
No ecological data are available