Archaeopteris macilenta

"Archaeopteris macilenta Temporal range: Late Devonian to Early Carboniferous PreЄ Є O S D C P T J K Pg N
Reconstruction of Archaeopteris macilenta from the Late Devonian Walton Formation, Hancock New York
Scientific classification
Kingdom:	Plantae
Division:	†Progymnospermophyta
Order:	Archaeopteridales
Family:	Archaeopteridaceae
Genus:	Archaeopteris

Archaeopteris macilenta is distinguished from other species of the genus by leaves which are divided into narrow segments at their tips. Sporangia were bone of different parts of the branches with ordinary foliage leaves. Archaeopteris macilenta leaves and fertile shoots are attached to wood which when permineralized is called Callixylon newberryi^[1][2]

A sterile specimen of Archaeopteris macilenta from the Late Devonian, Walton Formation of Deposit, New York

A fertile specimen of Archaeopteris macilenta from the Late Devonian Walton Formation of deposit, New York

References

1. Beck, CB (1960). "The identity of Archaeopteris and Callixylon.". Brittonia 12 (4): 351–368. doi:10.2307/2805124. JSTOR 2805124.
2. Beck, CB (1962). "Reconstruction of Archaeopteris and further consideration of its phylogenetic position.". American Journal of Botany 49 (4): 373–382. doi:10.2307/2439077. JSTOR 2439077.

External links

• Introduction to the Progymnosperms
• Davis, Paul and Kenrick, Paul; Fossil Plants. Smithsonian Books (in association with the Natural History Museum of London), Washington, D.C. (2004). ISBN 1-58834-156-9