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SUMMARY
The buoyant density of deoxyribonucleic acid (DNA) from 32 species of poroid Agaricales, three in the Hymenochaetaceae and 29 in the Polyporaceae, was determined by CsCl density gradient equilibrium centrifugation. Expressed in moles per cent the guanine plus cytosine content (GC content) for the Hymenochaetaceae ranged from 50.0 to 51.0, with an average of 50.4 and for the Polyporaceae from 51.0 to 59.5 with an average of 56.1. The results suggest that in the Homobasidiomycetes the GC content of DNA may have taxonomic significance at the species, generic, family and higher levels but the sample is too small to provide a basis for firm conclusions.