NDLI: Anatomically preserved marattialean plants from the Upper Permian of southwestern China: the trunk of Psaronius panxianensis sp. nov.

Content Provider	Springer Nature Link
Author	He, X. Y. Wang, S. J. Hilton, Jason Tian, B. L. Zhou, Y. L.
Copyright Year	2008
Abstract	A new species of the marattialean fern trunk Psaronius Cotta is described from the Upper Permian Cathaysian flora in the Xuanwei Formation of Guizhou Province, SW China, and named P. panxianensis sp. nov. Stems possess a helically diverging sequence of leaf traces organized in a 2/7 phyllotaxy and are characterized by stages of leaf trace development that include an early ontogenetic stage with a single vascular bundle (Stewartiopteris-type), a middle stage with two vascular bundles (Stipitopteris-type), and a late stage with three vascular bundles. Roots diverge singly or occasionally in pairs, arising alternately from the centrifugal surface of the peripheral cauline bundles (PCB) near the tip, and form both bound and free root mantles. This species is distinguished from all previously recognized species from the Euramerican and Gondwana floras in having an anchor-shaped sclerenchymatous strand internal to the PCB and a large V-shaped strand formed by the connection of two anchor-shaped strands. Psaronius panxianensis sp. nov. is important as its leaf traces show three distinct ontogenetic development stages within the trunk, with this organization interpreted as a derived condition within psaroniaceous marattialean fern evolution. In the stem abundant air space suggests that P. panxianensis lived in waterlogged substrates with aerenchyma facilitating gaseous exchange. However, the presence of marattialean fern dominated communities in the Upper Permian of SW China suggest an overall drying trend with these plants replacing earlier lycopsid and sphenopsid dominated wetland communities.
Starting Page	155
Ending Page	180
Page Count	26
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	272
Issue Number	1-4
e-ISSN	16156110
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-31
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Marattiales Psaronius Stipitopteris Stewartiopteris Upper Permian anatomy Plant Sciences Plant Ecology Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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