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1993, M. R. Saxena, Palynology: A Treatise, page 34:
The sexine usually consists of two main parts, a partially or wholly covering layer — the tectum (roof) and below that the rods or rod-like elements — the bacules (baculum, columella).
^ De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 67