1983/03/01 by Ruth A. Stockey · 1 citation
Earth and Planetary Sciences · Agricultural and Biological Sciences · #Geology and Paleoclimatology Research #Plant Diversity and Evolution #Geological formations and processes #Bract #Pith #Ovule #Biology #Pinus <genus> #Pollen #Botany #Tracheid #Vascular bundle #Conifer cone #Anatomy #Inflorescence
paper · doi:10.1086/337355
openalex publication_date 1983/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/09
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.