Diversity of Ancient Conifers: The Jurassic Seed ConeBancroftiastrobus digitatagen. et sp. nov. (Coniferales)

Autor: Jason Hilton, Gar W. Rothwell, Ruth A. Stockey, Gene Mapes
Rok vydání: 2013
Předmět:
Zdroj: International Journal of Plant Sciences. 174:937-946
ISSN: 1537-5315
1058-5893
DOI: 10.1086/670368
Popis: Premise of research. A third genus of anatomically preserved conifer seed cones has been recognized from a Late Jurassic deposit in northeastern Scotland. This cone is described as Bancroftiastrobus digitata Rothwell, Mapes, Stockey et Hilton.Methodology. The cone was sectioned with the classic coal ball peel technique and studied and photographed with transmission light.Pivotal results. Bancroftiastrobus digitata is a cylindrical cone with large, helically arranged ovuliferous scales subtended by short bracts, each bract/scale complex bearing two unwinged inverted seeds on the adaxial surface of the ovuliferous scale. Ovuliferous scales have abaxial plications in the midregion and divide distally, forming up to nine free distal lobes that are vascularized and covered by a dense ramentum of trichomes. The cone axis forms a continuous woody cylinder that surrounds a parenchymatous pith. There are numerous resin canals in the cortex of the cone axis that extend into each bract/scale complex, both abaxial an...
Databáze: OpenAIRE
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