Callixylon wendtii

Name

Callixylon wendtii

Rank

Species

Generic Name

[Genus] Callixylon

Authors (Pub.)

Tanrattana M. Meyer-Berthaud B. Decombeix A.-L.  

Publication

Callixylon wendtii sp. nov., a new species of archaeopteridalean progymnosperm from the Late Devonian of Anti-Atlas, Morocco [2018/8]

Journal

Earth and environmental science transactions of the Royal Society of Edinburgh

Annee/Jahrgang

2018

Volume

108

Issue

4

Page number

3 [375]

Year

2018

Fossil Status

stems (wood)

Stratigraphy

Famennian

Strat. comment

upper part of Kellwasser member

Paleoregion

Gondwana (N Africa)

Data for Holotypus

Repository

Université de Montpellier, Montpellier, France

Repository Number

Specimen MD106

Num

3A–B, 4A–L

Pub.

Callixylon wendtii sp. nov., a new species of archaeopteridalean progymnosperm from the Late Devonian of Anti-Atlas, Morocco [2018/8]

Data for Paratypus

Repository

Geologisch-Paläontologisches Institut Tübingen, Eberhard Karls Universität Tübingen, Tübingen, Germany

Repository Number

Specimen 600/2/3

Num

3C–D, 5A–L

Pub.

Callixylon wendtii sp. nov., a new species of archaeopteridalean progymnosperm from the Late Devonian of Anti-Atlas, Morocco [2018/8]

Diagnosis

Axes with a large eustele characterised by a heterocellular pith consisting of parenchyma with interspersed sclerotic nests of variable sizes. Cells of sclerotic nests smaller and with thicker walls than parenchyma cells. Mesarch strands of primary xylem numerous, either in contact with the secondary xylem or separated from it by no more than a few rows of parenchyma cells. Secondary xylem showing faint Axes with a large eustele characterised by a heterocellular pith consisting of parenchyma with interspersed sclerotic nests of variable sizes. Cells of sclerotic nests smaller and with thicker walls than parenchyma cells. Mesarch strands of primary xylem numerous, either in contact with the secondary xylem or separated from it by no more than a few rows of parenchyma cells. Secondary xylem showing faint growth rings. Most rays uniseriate; few rays partly or entirely biseriate; scarce rays partly triseriate. Rays up to 60 cells high, the majority ten cells or less in height. Rays comprised of ray tracheids arranged unevenly between parenchyma cells, shorter than the latter in tangential section. Ray tracheids either scattered or in uninterrupted rows in radial section. Pits on the radial walls of tracheids showing oval oblique apertures. Occasional ungrouped pits on the tangential walls of tracheids. Occasional occurrence of septate tracheids and vertical parenchyma. Course of leaf traces short, within first two growth rings.