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PINUS WOLFEI, A NEW PETRIFIED CONE FROM THE EOCENE OF WASHINGTON
Author(s) -
Jr. Charles N. Miller.
Publication year - 1974
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1974.tb12300.x
Subject(s) - bract , pinus <genus> , subgenus , biology , cone (formal languages) , conifer cone , xylem , paleontology , botany , scale (ratio) , taxonomy (biology) , physics , mathematics , algorithm , inflorescence , quantum mechanics
A silicified cone from the Late Eocene of Washington is described as a new fossil species of Pinus. The cone was probably 9–10 cm long and 3–5 cm at its widest diam in the living condition and is peculiar in having abundant resin canals in the secondary xylem of the axis arranged in three concentric rings near the cone base. The bract of the fossil is also unusual in having resin canals of distinctly unequal sizes and a vascular strand that is adaxially concave. In the absence of external features of the scale tips, these anatomical conditions along with the construction of the outer cortex of the axis of thick‐walled cells suggest closest affinity of the new species with the subsections Contortae, Oocarpae , and Sylvestres of the section Pinus , subgenus Pinus.