Poria Radiculosa, a Creosote-Tolerant Organism

In an examination in 1947 of cresoted “pile bottoms” that had been removed from service after about 10 years, it was observed that the predominant organism in evidence was one whose stringlike rhizomorphs practically filled the rotted portions of these members, so that armfulls could actually be obtained from just a few pieces. These rhizomorphs resembled white string when dead, but the living mycelium, which could be found by tracing the white threads into the moisture sections of the wood, was sulphur yellow in appearance. The living yellow strands were found to be in contact with wood containing residual creosote. Specimens of the mycelium were identified to be Poria radiculosa Peck.

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