The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2021

IDNAME urn:idName:fossilplants.info:genus:8C6B961A-5BF2-3857-3AD9-9E1524BB7CD2 genus
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Yavanna

Genus Yavanna E.I. Vera Cretac. Res., 2013, (10.1016/j.cretres.2013.04.011): 2. 22 May 2013
Name
Yavanna
Rank
Genus
Authors (Pub.)
Vera E. I.  
Publication
New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica [2013/5]
Journal
Cretaceous Research
Annee/Jahrgang
2013
Issue
10.1016/j.cretres.2013.04.011
Page number
2
Year
2013
Parent Taxon
[Family] Cyatheaceae
Fossil Status
stems
Type
Yavanna chimaerica
Diagnosis
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 corrugate 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.
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