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callous: Hard-leathery, callous tissue usually is also thicker than comparable adjacent tissue.[1]
The given value was not understood.
The given value was not understood.

Example(s): Example sentences from FNA : [1] lip simple [2–5-lobed ], membranous [thickly fleshy ], callous, base loosely articulate to base of column or apex of column foot [sometimes inflexibly adnate ]; [2] Leaves mostly all deciduous in fruit, sessile, linear-elliptic, 5–15 2–4 mm, glabrous, margin callous thickened and with several pointed teeth on each side.


  1. Categorical Glossary for the Flora of North America Project, by Robert W. Kiger and Duncan M. Porter. 2001. Hunt Institute for Botanical Documentation.