The role of chelation within the soil itself is discussed. The usefulness of lichens for studying early stages of pedogenesis was investigated. Interactions between soil-, rock-, and bark-inhabiting lichens with powdered granite, muscovite, and greensand marl were determined by changes in light transmission of the aqueous supernatant solutions. Physodic Table I. Species, Acid Content, and Source of Lichens lichens Baeomyces roseus Cladonia furcata C. sylvatica Peltigera aphthosa Caloplaca elegans Parmelia conspersa (I) P. conspersa (II) P. stenophylla Umbillicaria arctica Evernia vulpina P. furfur acea (I) P. furfur acea (II) P. furfur acea (III) lichen Acidsa Locale Terricolous lichens Baeomycic Mass.
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