Abstract

Coenogonium linkii Ehrenb. is a very common filamentous lichen, growing on stems, hanging roots, and lianas in the understory of neotropical lowland rain forests. We investigated several thalli of this species from locations in Panama and French Guiana. All thalli were inhabited by various species of terrestrial diatoms, which were found between the thallus filaments on extracellular material of the mycobiont. We identified 18 species of diatoms belonging to nine genera: Diadesmis, Eunotia, Hantzschia, Luticola, Melosira, Nitzschia, Orthoseira, Pinnularia, and Stauroneis. The potential benefits both diatoms and lichens could derive from symbiosis in relation to water, irradiance, and nitrogen availability are discussed.

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