Stigmaria

Stigmaria
Temporal range: Carboniferous to Permian
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Lycophytes
Class: Lycopodiopsida
Order: Lepidodendrales
Genus: Stigmaria
Broningart
Stigmaria, a fossil lycopsid rhizome.
In situ lycopsid with attached stigmarian system. Joggins Formation (Pennsylvanian), Cumberland Basin, Nova Scotia.
Bedding plane view of a flattened Stigmaria preserved atop a shallow-water carbonaceous limestone in the Joggins Formation (Pennsylvanian), Cumberland Basin, Nova Scotia.

Stigmaria is a form taxon for common fossils found in Carboniferous rocks.[1] They represent the underground rooting structures of coal forest lycopsid trees such as Sigillaria and Lepidodendron. These swamp forest trees grew to 50 meters and were anchored by an extensive network of branching underground structures with "rootlets" attached to them. Analysis of the morphology and anatomy of these stigmarian systems suggests they were shoot-like and so they are called rhizomes or rhizophores. The stigmarian rhizomes are typically covered with a spiral pattern of circular scars where "rootlets" were attached. Since the stigmarian systems are shoot-like, these "rootlets" may be modified leaves, adapted to serve the function of roots. However, some paleontologists argue that the "rootlets" were true roots, with a complex branching structure and root hairs, comparable to the roots of the closest living relative of Lepidodendron, the quillworts (genus Isoetes).[2]

References

  1. ^ Rothwell, GW; Erwin, DM (1985). "The rhizophore apex of Paurodendron: implications for homologies among the rooting organs of Lycopsida". American Journal of Botany. 72: 86–98. doi:10.2307/2443571.
  2. ^ Hetherington, AJ; Berry, CM; Dolan, Liam (June 14, 2016). "Networks of highly branched stigmarian rootlets developed on the first giant trees" (PDF). PNAS. 113 (24): 6695–6700. doi:10.1073/pnas.1514427113. PMC 4914198. Retrieved 15 February 2017.



This page was last updated at 2019-11-11 15:53 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.


Top

If mathematical, chemical, physical and other formulas are not displayed correctly on this page, please useFirefox or Safari