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The root anatomy of the subalpine to alpine plant species Saussurea discolor (Willd.) DC., and Saussurea pygmaea (Jacq.) Spreng., (Asteraceae) has been investigated by means of light and fluorescence microscopy on specimens of Austrian provenance. Both species develop a so called interxylary cork which mediates the splitting of the root into various strands. This phenomenon takes place in the secondary xylem and involves the development of a periderm separating the originally solid xylem cylinder. Interxylary cork is currently known from approximately 40 species of the Dicotyledones. This is the first report of this specific anatomical structure from the two studied species.

Interxylary cork of Saussurea discolor and S. pygmaea (Asteraceae)