Phylogenetic analyses of ITS, nuclear large subunit and mitochondrial small subunit rDNA sequences from a variety of North American species have delineated five distinct clades within the core Laetiporus clade: sulphureus clade I contains white-pored L. sulphureus isolates, while sulphureus clade II contains yellow-pored L. sulphureus isolates.

In addition, phylogenetic clades have been identified from Japan, Hawaii, South America, Europe, and South Africa.
Phylogenetic analyses of ITS, nuclear large subunit and mitochondrial small subunit rDNA sequences from a variety of North American species have delineated five distinct clades within the core Laetiporus clade: sulphureus clade I contains white-pored L. sulphureus isolates, while sulphureus clade II contains yellow-pored L. sulphureus isolates.
In addition, phylogenetic clades have been identified from Japan, Hawaii, South America, Europe, and South Africa.
Laetiporus