The decay capacity of 14 strains of the brown-rot fungus Postia (= Poria) placenta was determined using soil-wood block tests. One isolate was identified as being unable to degrade wood and was determined to be monokaryotic. It retained the ability to produce extracellular carbohydrate-degrading enzymes, although regulation of certain enzymes was atypical under certain cultural conditions. It produced H2O2 and oxalic acid under a variety of carbon and nitrogen regimes, and did not contain double-stranded RNA. It failed to produce large quantities of extracellular polysaccharides in culture. An understanding of the physiology of this isolate would further our knowledge of decay mechanisms leading to safer preservation protocols.

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