colessor (kolesor)

[ colesula (kō-les ū-là), n.; pl. colesulæ (-lē). [NL., appar. irreg. As the fronds approach maturity the terminal leaves become modified so as to form an involucrum, within which a special covering appears, the colesule or perianth, sur rounding the pistil lid i a. Encyc. Brit ., XIV. 718.