title: Degeneration of Trachymene pilosa exine by osmium tetroxide used in impregnation technique.
abstract: Mature pollen grains of Trachymene pilosa (Umbelliferae) were treated at 40° C in 2% aqueous osmium for one to six days. Exine observed by (TEM) were progressively destroyed. After six days, they were reduced to a three-dimensional structure composed only of pollenkitt.
authors.affiliation: Laboratoire de Biologie et Ecologie Végétale, U.E.R. Sciences (C.N.R.S., RCP 574), B.P. 347, F-51062, Reims Cédex, France.
authors.forename: J C
authors.initials: JC
authors.lastname: Audran