We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Reappraisal of the ill-defined Liassic pteridosperm Dichopteris using an ultrastructural approach.
- Authors
Thévenard, Frédéric; Barale, Georges; Guignard, Gaëtan; Daviero-Gomez, Véronique; Gomez, Bernard; Philippe, Marc; Labert, Nicolas
- Abstract
This review of the genus Dichopteris De Zigno is based on the original fossil specimens collected from the Lower Jurassic of the Grey Limestones of Veneto (Northern Italy). The cuticular diagnosis of the genus is emended and only Dichopteris visianica De Zigno is retained within the genus. In addition, transverse and longitudinal sections of cuticles examined using a transmission electron microscope (TEM) indicate close similarities between D. visianica and other pteridosperm cuticles, especially the occurrence of granules arranged in areas of different densities in the epidermal cells and stomatal apparatus. Moreover, the dichotomy and the impressive size of the frond of D. visianica imply a specific architecture with a typical arrangement of the pinnae and pinnules. They preclude an herbaceous habit for the plant. Finally, architectural, microstructural and ultrastructural observations are consistent with palaeoclimatic and palaeoenvironmental data, and most probably support an understorey habit for D. visianica. © 2005 The Linnean Society of London, Botanical Journal of the Linnean Society, 2005, 149, 313–332.
- Subjects
ITALY; PTERIDOSPERMAE; ULTRASTRUCTURE (Biology); PLANT cuticle; PLANT classification; JURASSIC paleopedology; PALEOBOTANY
- Publication
Botanical Journal of the Linnean Society, 2005, Vol 149, Issue 3, p313
- ISSN
0024-4074
- Publication type
Article
- DOI
10.1111/j.1095-8339.2005.00439.x