Download the full-sized PDF of Reproductive biology of the Cerro Cuadrado (Jurassic) fossil conifers: Pararaucaria patagonica WielandDownload the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Biological Sciences, Department of


This file is in the following collections:

Journal Articles (Biological Sciences)

Reproductive biology of the Cerro Cuadrado (Jurassic) fossil conifers: Pararaucaria patagonica Wieland Open Access


Author or creator
Stockey, R. A.
Additional contributors
Petrified forests
Type of item
Journal Article (Published)
Seventy-two silicified cone specimens of Pararaucaria patagonica Wieland from the Cerro Cuadrado (Jurassic) petrified forest in Patagonia were studied by use of thin sections and reflected light. Traces from the cone axis stele to the bract and ovuliferous scale are separate at their origins. In cross section the abaxially concave ovuliferous scale trace and massive circular bract trace branch half-way out into the cone-scale complex. Two triangular-shaped bundles of fibers follow the scale trace into the laminar part of the ovuliferous scale. Both surfaces of the ovuliferous scale possess hairs which may have assisted in cone closure. Cones typically contain one flattened, winged seed per ovuliferous scale. Multi-layered seed integuments are represented by an inner fleshy layer of large cells filled with a black amorphous material, a sclerotesta consisting of wedges or fan-shaped groups of sclereids oriented at right angles to the seed surface, and a thin, often crushed fleshy layer. Seed wings consist of anastomosing, branched cells resembling glandular hairs and containing many intercellular spaces. Well-preserved polycotyledonous embryos containing up to eight cotyledons are present in several cones. Tissues of the embryo including the shoot apex, calyptroperiblem, hypocotyl, and cotyledons are described. On the basis of anatomical and morphological features, specimens of P. patagonica are compared to members of both extant and extinct families of conifers including the Araucariaceae, Taxodiaceae, Pinaceae, Cupressaceae, and Cheirolepidaceae.
Date created
License information
© 1977 Botanical Society of America. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Stockey, R.A. (1977). Reproductive biology of the Cerro Cuadrado (Jurassic) fossil conifers: Pararaucaria patagonica Wieland. American Journal of Botany, 64(6), 733-744.
Link to related item

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 3398881
Last modified: 2015:10:12 21:24:13-06:00
Filename: AJOB_64_1977_733.pdf
Original checksum: c7da9d85dcf18ca3f6cdbff49d625b1b
Well formed: false
Valid: false
Status message: Invalid object number in cross-reference stream offset=3398846
File title: Reproductive Biology of the Cerro Cuadrado (Jurassic) Fossil Conifers: Pararaucaria patagonica
File language: en
Activity of users you follow
User Activity Date