Iron species are unknown, [Nota de rodapé 1: According to Vicillaid, the red soils of New Caledonia, rich in iron, are said to exhibit an entirely characteristic flora, which includes Dammara ovata, Eulassa intermedia, and Dacrydium caledonica.] with the exception of a peculiar iron-favoring community of microorganisms (Molisch, 1910). In moor  tussocks iron bacteria (Crenothrix polyspora, Chlamydothrix ferruginea, etc.) live on the finely divided humus releasing iron hydroxide. This product is precipitated as an intensely reddish-yellow, flaky substance, while the moor water itself appears to be covered by an iridescent, oily film. In a similar manner, it is believed, Crenothrix manganifera is active in the precipitation of manganese. (Braun-Blanquet 1932:190-1)
BRAUN-BLANQUET, Josias. 1932. Plant sociology: the study of plant communities. (Trans.: George D. Fuller; Henry S. Conard) New York: McGraw-Hill Book Company.