You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Pinus Driftwoodensis Sp.n. from the Early Tertiary of British Columbia
Ruth A. Stockey
Vol. 144, No. 1 (Mar., 1983), pp. 148-156
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/2474678
Page Count: 9
You can always find the topics here!Topics: Resin canals, Fossils, Plant cells, Bracts, Leaves, Tracheids, Ovules, Epidermal cells, Pollen, Cylinders
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
An ovulate pinaceous cone and associated needles, wood, and pollen cones were found permineralized within a small lens of chert in sediments of Middle Eocene age near Smithers, B.C. The ovulate cone, Pinus driftwoodensis sp.n., is cylindrical, about 3 cm long and 2.7 cm in diameter. Ovuliferous scales have swollen apices and an umbo lacking a spine. Pith and cortex of the axis are parenchymatous. The narrow vascular cylinder includes a ring of up to 70 resin canals. The trace to each bract and its associated ovuliferous scale arises as a single unit, circular in cross section, with an abaxial resin canal system. Two ovules with well-developed integuments but little internal tissue are borne on each ovuliferous scale. Pinaceous leaves, in two-needle fascicles, are associated with the cone. These needles contain two vascular bundles, numerous medial resin canals, stomata on both abaxial and adaxial surfaces, and a uniform hypodermis. Associated wood and small twigs have pinoid resin canals, heterogeneous rays to 14 cells high, uniseriate circular-bordered pits, and pinoid pits in the cross field, and appear similar to that described for P. similkarneenensis Miller. Pollen cones are 6 mm long and cylindrical and have dehisced prior to preservation. The ovulate cone and the two-needle fascicles are closely comparable to members of the genus Pinus, subgenus Pinus, section Pinus, subsections Sylvestres, Ponderosae, or Australes and may represent parts of the same plant.
Botanical Gazette © 1983 The University of Chicago Press