Alloiopteris

Alloiopteris
	Alloiopteris erosa fossil
Temporal occurrence
	Carbon
Systematics
without rank:	Streptophyta
Empire :	Plants (Plantae)
Department :	Vascular plants (tracheophyta)
	Ferns
Order :	Zygopteridales
Genre :	Alloiopteris
Scientific name
	Alloiopteris
	R.Potonié

Alloiopteris is a genus from the order of the primitive ferns , Zygopteridales .

features

Fossils of sterile leaves are grouped together in the genus Alloiopteris . The species all have leaflets, the leaflets of which are sloping down at the base and which have clear apical lobes or teeth. Fossils with internal anatomy have been preserved from the Caseyville Formation in the Lower Pennsylvania of Illinois. Their characteristics indicate a connection with Zygopteris .

The vascular bundle of the primary leaflet has a butterfly shape in cross-section, while the vascular bundle of the leaflets are circular.

Alloiopteris sternbergii has also been found on Etapteris leaf units . The fact that Etapteris has different leaf shapes shows the difficulty of characterizing many of the Paleozoic ferns solely on the basis of their petiole anatomy.

Systematics and distribution

Alloiopteris is placed in the order Zygopteridales. It includes around 10 species.

supporting documents

Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8 , p. 414.

Individual evidence

↑ Wolfgang Frey, Eberhard Fischer, Michael Stech: Bryophytes and seedless Vascular Plants . In: Wolfgang Frey (Ed.): Syllabus of Plant Families - A. Engler's Syllabus of Plant Families . 13th edition. tape 3 . Borntraeger, Berlin / Stuttgart 2009, ISBN 978-3-443-01063-8 , pp. 325 .

Web links

Commons : Alloiopteris - collection of images, videos and audio files

[Syllabus-1] Wolfgang Frey, Eberhard Fischer, Michael Stech: Bryophytes and seedless Vascular Plants . In: Wolfgang Frey (Ed.): Syllabus of Plant Families - A. Engler's Syllabus of Plant Families . 13th edition. tape 3 . Borntraeger, Berlin / Stuttgart 2009, ISBN 978-3-443-01063-8 , pp. 325 .