Faironia

Name

Faironia

Rank

Genus

Authors (Pub.)

Decombeix A.-L. Galtier J. Meyer-Berthaud B.  

Publication

Faironia difasciculata, a new gymnosperm from the Early Carboniferous (Mississippian) of Montagne Noire, France [2006/12]

Journal

Review of Palaeobotany and Palynology

Volume

142

Issue

3-4

Page number

80

Year

2006

Parent Taxon

[Subclass] Pityidae

Fossil Status

stems (wood)

Type

Faironia difasciculata

Diagnosis

Stem with primary and secondary vascular tissues and primary cortex. Eustele consisting of numerous discrete axial strands of primary xylem at the periphery of a broad circular pith. Ratio of primary xylem diameter to stem diameter high (about 1:2). Leaves helically arranged. Each leaf initially supplied by two traces originating separately from two non-adjacent axial strands. The paired leaf traces divide in the cortex supplying the petiole base with at least six vascular bundles. Axial primary xylem strands sometimes separated from the secondary xylem by parenchyma. Axial strands and leaf trace bundles mesarch. Metaxylem tracheids with scalariform to multiseriate bordered pitting on all walls. Secondary xylemtracheidswithmultiseriate bordered pits on radial walls. Rays uni to quadriseriate, not high. Secondary phloem present, including fibres. Narrow cortex consisting of an inner zone of parenchyma with sclerotic nests and an outer zone of sparganum-type fibre bundles