intextine

from The Century Dictionary.

• noun In botany, a supplementary membrane which is sometimes present in the outer coat (extine) of pollen-grains, as in Œnothera, where the extine separates into a true extine and an intextine.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A thin membrane existing in the pollen grains of some plants, and situated between the extine and the intine, as in Œnothera.