Influence du fluor sur le Funaria hygrometrica et l’Hypogymnia physodes

Abstract

We fumigated plants of Funaria hygrometrica and Hypogymnia physodes with 13, 65, and 130 parts per billion (ppb) of hydrofluoric acid for 4, 8, and 12 h and then 13 ppb for 36, 72, and 108 h. We examined the macroscopic and microscopic changes, the quantity of fluoride absorbed, and the capacity of these plants to recuperate 3 weeks after fumigation. Results show that at concentrations of 65 ppb/12 h the moss and the lichen show chlorotic spots and already some chloroplasts start to disintegrate and plasmolysis occurs. After 3 weeks of recuperation the Funaria had lost between 26 and 36% and the Hypogymnia between 36 and 47% of the fluoride accumulated.