Аннотация:Agglutinin from Pemtigera aphthosa (L.) Willd. was isolated and its characteristics were obtained. It is a glycoprotein lectin with D-galactose specificity. Lectin concentration decreases from the apical parts of the thallus to its basal region. Finer differences in the agglutinating activity of different parts of the thallus reflect physiological differences in certain areas and their role in the functioning of lichen symbiosis.