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Example(s): Example sentences from FOC V13, V22 :  basal laminal cells rectangular, moderately thick-walled, narrower and thin-walled in several marginal rows;  supra-alar cells elongate, thin- and straight-walled, producing a pellucid marginal border of 20–30 cells;
- Categorical Glossary for the Flora of North America Project, by Robert W. Kiger and Duncan M. Porter. 2001. Hunt Institute for Botanical Documentation.