found: Oxford dict. of biol, 2004:p. 508 (The wall of the mature pollen grain consists of the tough outer wall (exine) and the more delicate narrower intine.)
found: Penguin dict. of biol, 2004(exine: outer layer of spores and pollen grains, usually divided into two main layers)
found: Dict. of plant sciences, 1998(exine: the outer, decay-resistant coat of pollen grains and spores)
found: Henderson's dict. of biol. terms, 1979(extine: the outer coat of spore or pollen grain; alt. exine, exosporium)
