Betalain pigments occur only in the Caryophyllales and some Basidiomycota (mushrooms).
In the Basidiomycota this is the dominate phase with most Basidiomycota monokaryons weakly growing ans short-lived.
Most fungi of Basidiomycota exist as a dikaryon in which threadlike cells are partially partitioned into segments each containing two differing nuclei.
Rhodotorula is a pigmented yeast, part of the Basidiomycota phylum, quite easily identifiable by distinctive orange/red colonies when grown on SDA (Sabouraud's Dextrose Agar).