Publications

BibTex format

@article{Wang:2017:10.3732/ajb.1600371,
author = {Wang, S-J and Bateman, RM and Spencer, ART and Wang, J and Shao, L and Hilton, J},
doi = {10.3732/ajb.1600371},
journal = {American Journal of Botany},
pages = {127--149},
title = {Anatomically preserved "strobili" and leaves from the Permian of China (Dorsalistachyaceae, fam. nov.) broaden knowledge of Noeggerathiales and constrain their possible taxonomic affinities},
url = {http://dx.doi.org/10.3732/ajb.1600371},
volume = {104},
year = {2017}
}

Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - PREMISE OF THE STUDY: Noeggerathiales are an extinct group of heterosporous shrubs and trees that were widespread and diverse during the Pennsylvanian–Permian Epochs (323–252 Ma) but are of controversial taxonomic affi nity. Groups proposed as close relatives include leptosporangiate ferns, sphenopsids,progymnosperms, or the extant eusporangiate fern Tmesipteris . Previously identifi ed noeggerathialeans lacked anatomical preservation, limiting taxonomiccomparisons to their external morphology and spore structure. We here document from the upper Permian of China the fi rst anatomically preservednoeggerathialeans, which enhance the perceived distinctiveness of the group and better indicate its systematic affi nity.METHODS: We describe in detail the newly discovered, anatomically preserved heterosporous strobilus Dorsalistachya quadrisegmentorum , gen. et sp. nov.,and redescribe its suspected foliar correlate, the pinnate leaf Plagiozamites oblongifolius .KEY RESULTS: Plagiozamites possesses an omega ( Ω )-shaped vascular trace and prominent cortical secretory cavities—a distinctive anatomical organizationthat is echoed in the newly discovered strobili. Dorsalistachya strobili bear highly dissected sporophylls alternately in two vertical rows, suggestingthat they are homologs of leaf pinnae. If so, the “strobilus” is strictly a pseudostrobilus and consists of sporangium-bearing units that are one hierarchicallevel below true sporophylls. The “sporophylls” bear four microsporangia on the lower (abaxial) surface, occasionally interspersed with short longitudinalrows of megasporangia. A single functional megaspore develops within each winged megasporangium, suggesting adaptation for dispersal as asingle unit.CONCLUSIONS: Dorsalistachya presents a unique combination of reproductive features that amply justifi es establishment of a new family, Dorsalistachyaceae. Noeggerathialesrepresent a distinct taxonomic Order of free-spo
AU  - Wang,S-J
AU  - Bateman,RM
AU  - Spencer,ART
AU  - Wang,J
AU  - Shao,L
AU  - Hilton,J
DO  - 10.3732/ajb.1600371
EP  - 149
PY  - 2017///
SN  - 0002-9122
SP  - 127
TI  - Anatomically preserved "strobili" and leaves from the Permian of China (Dorsalistachyaceae, fam. nov.) broaden knowledge of Noeggerathiales and constrain their possible taxonomic affinities
T2  - American Journal of Botany
UR  - http://dx.doi.org/10.3732/ajb.1600371
UR  - http://hdl.handle.net/10044/1/53470
VL  - 104
ER  -

Download

Alan R.T. Spencer

Contact

Location

Summary

Citation

BibTex format

RIS format (EndNote, RefMan)