Journal
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
Volume 203, Issue -, Pages 35-47Publisher
ELSEVIER
DOI: 10.1016/j.revpalbo.2014.01.003
Keywords
Changxingia; Isoetales sensu lato; Lagenicula; Late Devonian; monosporangiate-strobilus lycopsid; Wutong Formation
Categories
Funding
- National Natural Science Foundation of China [41172007, 41272018]
Ask authors/readers for more resources
Changxingia longifolia gen. et sp. nov. is described from the Upper Devonian Wutong Formation, Changxing County, northern Zhejiang Province, China. It possesses dichotomous axes, linear and smooth sterile leaves, rhomboidal leaf cushions with ligule pits and oval-oblanceolate leaf scars, and terminal sterile shoots or probable megasporangiate strobili. Leaves may have been persistent or not. Leaf cushions or bases bearing a ridge are helically arranged in parastichies on wide axes. Smooth megasporophylls with vertically expanded base borne in helices include a pedicel, a heel and an upturned linear lamina. The pedicel consists of a distinct keel and horizontal alations and the lamina has the distal part reflexed abaxially. A single ellipsoidal and sessile megasporangium occurs on the adaxial side of the pedicel and produces Lagenicula-type megaspores with delicate spines. Changxingia may be assigned to the Dichostrobiles of the Isoetales sensu lato and is compared with related taxa of the Late Palaeozoic. Fertile units (megasporophyll-sporangium complexes) are interpreted to have functioned as spore dispersal units. Heterosporous lycopsids with monosporangiate strobili are scarce in the Devonian, and Changxingia thus contributes to understanding of their early evolutionary history and megaspore dispersal mechanisms. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available