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A CALAMITEAN SHOOT APEX FROM THE PENNSYLVANIAN OF IOWA
Author(s) -
Melchior Robert C.,
Hall John W.
Publication year - 1961
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.1537-2197.1961.tb11715.x
Subject(s) - apex (geometry) , biology , meristem , primordium , pennsylvanian , botany , elongation , plant stem , pith , perianth , shoot , ramification , anatomy , paleontology , pollen , stamen , biochemistry , materials science , structural basin , combinatorics , ultimate tensile strength , metallurgy , gene , mathematics
M elchior , R obert C., and J ohn W. H all . (U. Minnesota, Minneapolis.) A calamitean shoot apex from the Pennsylvanian of Iowa. Amer. Jour. Bot. 48(9): 811–815. Illus. 1961.—A shoot apex of a calamitean stem is described from the Des Moines Series, Middle Pennsylvanian. Internodal elongation of the 7 preserved internodes follows a sigmoid curve. A large apical cell has produced derivatives in a fashion apparently comparable to those in Equisetum arvense , except for the number of cells in the first leaf primordium ring and, possibly, the intercalary meristem. Pith meristem developed close to the apical cell. Data from internodal cell elongation of hypodermal cells of the cortex are presented which demonstrate intercalary internodal growth; no intercalary meristems are preserved and the existence of intercalary meristems which might have produced a jointed stem like that of Equisetum is only inferred.