Buckya

Name

Buckya

Rank

Genus

Authors (Pub.)

Herbst R. Crisafulli A.  

Publication

Buckya austroamericana nov. gen. et sp. (Bennettitales) from the Upper Triassic Laguna Colorada Formation (El Tranquilo Group), Santa Cruz province, Argentina [2016]

Journal

Serie Correlación Geológica / Instituto Superior de Correlación Geológica, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán

Issue

32

Page number

88

Year

2016

Parent Taxon

[Order] Bennettitales

Fossil Status

stems

Type

Buckya austroamericana

Diagnosis

Stem mainly oval in outline, monopodial; pith wide, oval in outline, containing either parenchymatic, secretory, mucilaginous, sclerenchymatic, vascular strands, dark cells and mucilaginous sacs, or different associations of these elements. Pith surrounded by one cycle of xylem (monoxylic condition); endarch primary xylem with tracheids with scalariform thickenings, with scarce parenchyma, surrounded by phloem and dense secondary xylem, with variable tracheid pitting types (scalariform and/or uni-multiseriate bordered pits). Growth rings (generally well) distinct. Rays one- to tetraseriate, of variable height. Cortex parenchymatous with mucilaginous elements, dark-content cells and interstitial sclerenchyma, sometimes organized in elongated bands, sporadically with vascular strands and hairy indumentum. In transverse section, leaf and /or branch scars of variable and irregular size and outline, composed of secondary xylem surrounded by a sclerenchyma ring. Externally (laterally) leaf scars also of irregular form and size, not contiguous, helically arranged around the stem (of the Bucklandia type).