Hey Dot,
Check the tag for your plant - if it says (pearcei 'Birchwood' AM/AOS x Sorcerer's Apprentice 4N) I know the proper way to label your cross. The plant pearceii 'Birchwood' is in reality Phrag richterii. So if your tag lists that clone of pearcei, you have the cross Kai Quintal = (richterii x Sorcerer's Apprentice) Quintal Farms is a wholesaler that has sold a number of cases of phrags into the midwest (some may have come through me) That cross was a popular cross in the shipments sent 2004 to 2007. I try to update the tags on plants I've handled, but not everybody has.